diff --git a/.circleci/config.yml b/.circleci/config.yml
index 0d058ce7fdc..bc64953cc77 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -1,198 +1,161 @@
-version: 2
+version: 2.1
 
-defaults: &linux_defaults
-  working_directory: /go/src/github.com/cosmos/gaia
-  docker:
-    - image: circleci/golang:1.12
-      environment:
-        GO111MODULE: 'on'
+executors:
+  golang:
+    docker:
+      - image: circleci/golang:1.13
+    working_directory: /go/src/github.com/cosmos/cosmos-sdk
+  mac:
+    macos:
+      xcode: "10.3.0"
+    working_directory: /Users/distiller/project/src/github.com/cosmos/cosmos-sdk
+    environment:
+      GO_VERSION: "1.13"
+  docs:
+    docker:
+      - image: tendermintdev/jq_curl
+    environment:
+      AWS_REGION: us-east-1
 
 
-############
-#
-# Configure macos integration tests
-
-macos_config: &macos_defaults
-  macos:
-    xcode: "10.1.0"
-  working_directory: /Users/distiller/project/src/github.com/cosmos/cosmos-sdk
-  environment:
-    GO_VERSION: "1.12.5"
-
-set_macos_env: &macos_env
-  run:
-    name: Set environment
-    command: |
-      echo 'export PATH=$PATH:$HOME/go/bin' >> $BASH_ENV
-      echo 'export GOPATH=$HOME/project' >> $BASH_ENV
-      echo 'export PATH=$PATH:$HOME/go/bin:$GOPATH/bin' >> $BASH_ENV
-      echo 'export GO111MODULE=on'
-
-############
-#
-# Configure docs deployment
-
-docs_update: &docs_deploy
-  working_directory: ~/repo
-  docker:
-    - image: tendermintdev/jq_curl
-  environment:
-    AWS_REGION: us-east-1
+commands:
+  make:
+    parameters:
+      description:
+        type: string
+      target:
+        type: string
+    steps:
+      - attach_workspace:
+          at: /tmp/bin
+      - restore_cache:
+          name: "Restore source code cache"
+          keys:
+            - go-src-v1-{{ .Revision }}
+      - checkout
+      - restore_cache:
+          name: "Restore go modules cache"
+          keys:
+            - go-mod-v1-{{ checksum "go.sum" }}
+      - run:
+          name: << parameters.description >>
+          command: |
+            export BINDIR=/tmp/bin
+            make << parameters.target >>
+  mac_set_env:
+    steps:
+      - run:
+          name: "Set environment"
+          command: |
+            echo 'export PATH=$PATH:$HOME/go/bin' >> $BASH_ENV
+            echo 'export GOPATH=$HOME/project' >> $BASH_ENV
+            echo 'export PATH=$PATH:$HOME/go/bin:$GOPATH/bin' >> $BASH_ENV
+            echo 'export GO111MODULE=on'
 
 jobs:
   setup_dependencies:
-    <<: *linux_defaults
+    executor: golang
     steps:
-      - run: mkdir -p /tmp/workspace/bin
-      - run: mkdir -p /tmp/workspace/profiles
       - checkout
       - restore_cache:
+          name: "Restore go modules cache"
           keys:
             - go-mod-v1-{{ checksum "go.sum" }}
       - run:
-          name: binaries
+          name: Cache go modules
+          command: make go-mod-cache
+      - run:
+          name: Build
+          command: make build
+      - run:
+          name: "Git garbage collection"
+          command: git gc
+      - run:
+          name: "Build tools binaries"
           command: |
-            export PATH=/tmp/workspace/bin:$PATH
-            make go-mod-cache
-            make install
+            make tools
       - save_cache:
+          name: "Save go modules cache"
           key: go-mod-v1-{{ checksum "go.sum" }}
           paths:
             - "/go/pkg/mod"
+      - save_cache:
+          name: "Save source code cache"
+          key: go-src-v1-{{ .Revision }}
+          paths:
+            - ".git"
       - run:
-          name: tools
           command: |
-            make tools TOOLS_DESTDIR=/tmp/workspace/bin
-            cp $GOPATH/bin/runsim /tmp/workspace/bin/
+            mkdir -p /tmp/bin
+            cp -r /go/bin/* /tmp/bin
       - persist_to_workspace:
-          root: /tmp/workspace
+          root: "/tmp/bin"
           paths:
-            - bin
-            - profiles
+            - "."
 
-  integration_tests:
-    <<: *linux_defaults
-    parallelism: 1
+  test_sim_nondeterminism:
+    executor: golang
     steps:
-      - attach_workspace:
-          at: /tmp/workspace
-      - checkout
-      - restore_cache:
-          keys:
-            - go-mod-v1-{{ checksum "go.sum" }}
-      - run:
-          name: Test cli
-          command: |
-            export BUILDDIR=`pwd`/build
-            make check-build
+      - make:
+          target: test_sim_nondeterminism
+          description: "Test Gaia non-determinism simulations"
 
-  test_sim_gaia_nondeterminism:
-    <<: *linux_defaults
-    parallelism: 1
+  test_sim_import_export:
+    executor: golang
     steps:
-      - attach_workspace:
-          at: /tmp/workspace
-      - checkout
-      - restore_cache:
-          keys:
-            - go-mod-v1-{{ checksum "go.sum" }}
-      - run:
-          name: Test individual module simulations
-          command: |
-            make sim-gaia-nondeterminism
+      - make:
+          target: test_sim_import_export
+          description: "Test Gaia import/export simulation"
 
-  test_sim_gaia_fast:
-    <<: *linux_defaults
-    parallelism: 1
+  test_sim_after_import:
+    executor: golang
     steps:
-      - attach_workspace:
-          at: /tmp/workspace
-      - checkout
-      - restore_cache:
-          keys:
-            - go-mod-v1-{{ checksum "go.sum" }}
-      - run:
-          name: Test full Gaia simulation
-          command: |
-            make sim-gaia-fast
+      - make:
+          target: test_sim_after_import
+          description: "Test Gaia simulation after importing state"
 
-  test_sim_gaia_import_export:
-    <<: *linux_defaults
-    parallelism: 1
+  test_sim_multi_seed_short:
+    executor: golang
     steps:
-      - attach_workspace:
-          at: /tmp/workspace
-      - checkout
-      - restore_cache:
-          keys:
-            - go-mod-v1-{{ checksum "go.sum" }}
-      - run:
-          name: Test Gaia import/export simulation
-          command: |
-            /tmp/workspace/bin/runsim -j 4 github.com/cosmos/gaia/app 50 5 TestGaiaImportExport
+      - make:
+          target: test_sim_multi_seed_short
+          description: "Test Gaia multi-seed simulation (short-lived)"
 
-  test_sim_gaia_simulation_after_import:
-    <<: *linux_defaults
-    parallelism: 1
+  test_sim_multi_seed_long:
+    executor: golang
     steps:
-      - attach_workspace:
-          at: /tmp/workspace
-      - checkout
-      - restore_cache:
-          keys:
-            - go-mod-v1-{{ checksum "go.sum" }}
-      - run:
-          name: Test Gaia import/export simulation
-          command: |
-            /tmp/workspace/bin/runsim -j 4 github.com/cosmos/gaia/app 50 5 TestGaiaSimulationAfterImport
-
-  test_sim_gaia_multi_seed_long:
-    <<: *linux_defaults
-    parallelism: 1
-    steps:
-      - attach_workspace:
-          at: /tmp/workspace
-      - checkout
-      - restore_cache:
-          keys:
-            - go-mod-v1-{{ checksum "go.sum" }}
-      - run:
-          name: Test multi-seed Gaia simulation long
-          command: |
-            /tmp/workspace/bin/runsim -j 4 github.com/cosmos/gaia/app 500 50 TestFullGaiaSimulation
+      - make:
+          target: test_sim_multi_seed_long
+          description: "Test Gaia multi-seed simulation (long-lived)"
 
-  test_sim_gaia_multi_seed:
-    <<: *linux_defaults
-    parallelism: 1
+  integration_tests:
+    executor: golang
     steps:
-      - attach_workspace:
-          at: /tmp/workspace
       - checkout
       - restore_cache:
           keys:
             - go-mod-v1-{{ checksum "go.sum" }}
       - run:
-          name: Test multi-seed Gaia simulation short
+          name: Test CLI integration
           command: |
-            /tmp/workspace/bin/runsim -j 4 github.com/cosmos/gaia/app 50 10 TestFullGaiaSimulation
+            export BUILDDIR=`pwd`/build
+            make check-build
 
   test_cover:
-    <<: *linux_defaults
+    executor: golang
     parallelism: 4
     steps:
-      - attach_workspace:
-          at: /tmp/workspace
       - checkout
-      - run: mkdir -p /tmp/logs
       - restore_cache:
           keys:
             - go-mod-v1-{{ checksum "go.sum" }}
       - run:
-          name: Run tests
+          name: Run tests with coverage
           command: |
             export VERSION="$(git describe --tags --long | sed 's/v\(.*\)/\1/')"
             export GO111MODULE=on
-            for pkg in $(go list ./... | grep -v github.com/cosmos/gaia/cli_test | grep -v '/simulation' | circleci tests split --split-by=timings); do
+            mkdir -p /tmp/logs /tmp/workspace/profiles
+            for pkg in $(go list ./... | grep -v '/simulation' | circleci tests split); do
               id=$(echo "$pkg" | sed 's|[/.]|_|g')
               go test -mod=readonly -timeout 8m -race -coverprofile=/tmp/workspace/profiles/$id.out -covermode=atomic -tags='ledger test_ledger_mock' "$pkg" | tee "/tmp/logs/$id-$RANDOM.log"
             done
@@ -204,8 +167,7 @@ jobs:
           path: /tmp/logs
 
   upload_coverage:
-    <<: *linux_defaults
-    parallelism: 1
+    executor: golang
     steps:
       - attach_workspace:
           at: /tmp/workspace
@@ -224,44 +186,45 @@ jobs:
       - run:
           name: filter out DONTCOVER
           command: |
-            excludelist="$(find ./ -type f -name '*.go' | xargs grep -l 'DONTCOVER' | xargs realpath --relative-to=$GOPATH/src)"
+            excludelist="$(find . -type f -name '*.go' | xargs grep -l 'DONTCOVER')"
             for filename in ${excludelist}; do
-              echo "Excluding ${filename} ..."
-              sed -i "\%${filename}:%d" coverage.txt
+              filename=$(echo $filename | sed 's/^./github.com\/cosmos\/gaia/g')
+              echo "Excluding ${filename} from coverage report..."
+              sed -i.bak "/$(echo $filename | sed 's/\//\\\//g')/d" coverage.txt
             done
       - run:
           name: upload
           command: bash <(curl -s https://codecov.io/bash) -f coverage.txt
 
   localnet:
-      working_directory: /home/circleci/.go_workspace/src/github.com/cosmos/cosmos-sdk
-      machine:
-        image: circleci/classic:latest
-      environment:
-        GOPATH: /home/circleci/.go_workspace/
-        GOOS: linux
-        GOARCH: amd64
-        GO_VERSION: "1.12.5"
-      parallelism: 1
-      steps:
-        - checkout
-        - run:
-            name: run localnet and exit on failure
-            command: |
-              pushd /tmp
-              wget https://dl.google.com/go/go$GO_VERSION.linux-amd64.tar.gz
-              sudo tar -xvf go$GO_VERSION.linux-amd64.tar.gz
-              sudo rm -rf /usr/local/go
-              sudo mv go /usr/local
-              popd
-              set -x
-              make tools
-              make build-linux
-              make localnet-start
-              ./contrib/localnet-blocks-test.sh 40 5 10 localhost
+    working_directory: /home/circleci/.go_workspace/src/github.com/cosmos/gaia
+    machine:
+      image: circleci/classic:latest
+    environment:
+      GOPATH: /home/circleci/.go_workspace/
+      GOOS: linux
+      GOARCH: amd64
+      GO_VERSION: "1.13"
+    parallelism: 1
+    steps:
+      - checkout
+      - run:
+          name: run localnet and exit on failure
+          command: |
+            pushd /tmp
+            wget https://dl.google.com/go/go$GO_VERSION.linux-amd64.tar.gz
+            sudo tar -xvf go$GO_VERSION.linux-amd64.tar.gz
+            sudo rm -rf /usr/local/go
+            sudo mv go /usr/local
+            popd
+            set -x
+            make tools
+            make build-linux
+            make localnet-start
+            ./contrib/localnet-blocks-test.sh 40 5 10 localhost
 
   deploy_docs:
-    <<: *docs_deploy
+    executor: docs
     steps:
       - checkout
       - run:
@@ -285,9 +248,9 @@ jobs:
             fi
 
   macos_ci:
-    <<: *macos_defaults
+    executor: mac
     steps:
-      - *macos_env
+      - mac_set_env
       - run:
           name: Install go
           command: |
@@ -305,8 +268,7 @@ jobs:
             make install
       - run:
           name: Integration tests
-          command:
-            source $BASH_ENV
+          command: source $BASH_ENV
             make check-build
       - run:
           name: Test full gaia simulation
@@ -315,7 +277,7 @@ jobs:
             make sim-gaia-fast
 
   docker_image:
-    <<: *linux_defaults
+    executor: golang
     steps:
       - attach_workspace:
           at: /tmp/workspace
@@ -333,12 +295,12 @@ jobs:
             docker build .
           else
             docker build -t tendermint/gaia:$GAIAD_VERSION .
-            docker login --password-stdin -u $DOCKER_USER <<<$DOCKER_PASS
+            docker login --password-stdin -u $DOCKER_USER \<<<$DOCKER_PASS
             docker push tendermint/gaia:$GAIAD_VERSION
           fi
 
   docker_tagged:
-    <<: *linux_defaults
+    executor: golang
     steps:
       - attach_workspace:
           at: /tmp/workspace
@@ -347,11 +309,11 @@ jobs:
           docker_layer_caching: true
       - run: |
           docker build -t tendermint/gaia:$CIRCLE_TAG .
-          docker login --password-stdin -u $DOCKER_USER <<<$DOCKER_PASS
+          docker login --password-stdin -u $DOCKER_USER \<<$DOCKER_PASS
           docker push tendermint/gaia:$CIRCLE_TAG
 
   reproducible_builds:
-    <<: *linux_defaults
+    executor: golang
     steps:
       - attach_workspace:
           at: /tmp/workspace
@@ -379,7 +341,7 @@ jobs:
 # overrides the .gaiad directory.
 #
 #  contract_tests:
-#    <<: *linux_defaults
+#    executor: golang
 #    steps:
 #      - attach_workspace:
 #          at: /tmp/workspace
@@ -434,29 +396,28 @@ workflows:
       - integration_tests:
           requires:
             - setup_dependencies
-      - test_sim_gaia_nondeterminism:
+      - test_sim_nondeterminism:
           requires:
             - setup_dependencies
-      - test_sim_gaia_fast:
+      - test_sim_import_export:
           requires:
             - setup_dependencies
-      - test_sim_gaia_import_export:
+      - test_sim_after_import:
           requires:
             - setup_dependencies
-      - test_sim_gaia_simulation_after_import:
+      - test_sim_multi_seed_short:
           requires:
             - setup_dependencies
-      - test_sim_gaia_multi_seed:
-          requires:
-            - setup_dependencies
-      - test_sim_gaia_multi_seed_long:
+      - test_sim_multi_seed_long:
           requires:
             - setup_dependencies
+          # These filters ensure that the long sim only runs during release
           filters:
             branches:
+              ignore: /.*/
+            tags:
               only:
-                - master
-                - develop
+                - /^v.*/
       - test_cover:
           requires:
             - setup_dependencies
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 53dd902fdb1..e3fb5a53a18 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -36,6 +36,16 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ## [Unreleased]
 
+### Improvements
+
+* [\#119](https://github.com/cosmos/gaia/pull/119) Refactor and upgrade Circle CI
+configuration.
+
+### Features
+
+* (gaiad) [\#119](https://github.com/cosmos/gaia/pull/119) Add support for the `--halt-time` and
+`--inter-block-cache` CLI flags and configuration.
+
 ## [v2.0.0] - 2019-08-22
 
 ### Bug Fixes
diff --git a/Makefile b/Makefile
index e045fb43b8d..9b6854b7f69 100644
--- a/Makefile
+++ b/Makefile
@@ -93,8 +93,6 @@ install: go.sum check-ledger
 install-debug: go.sum
 	go install -mod=readonly $(BUILD_FLAGS) ./cmd/gaiadebug
 
-
-
 ########################################
 ### Tools & dependencies
 
diff --git a/README.md b/README.md
index 3c2b82021f4..ca6dd6a8d06 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,7 @@
 
 This repository hosts `Gaia`, the first implementation of the Cosmos Hub.
 
-**Note**: Requires [Go 1.12+](https://golang.org/dl/)
+**Note**: Requires [Go 1.13+](https://golang.org/dl/)
 
 **DISCLAIMER**: The current version of Gaia running the Cosmos Hub (v0.34.x) is
 __NOT__ maintained in this repository. Gaia and the [Cosmos SDK](https://github.com/cosmos/cosmos-sdk/)
diff --git a/app/app.go b/app/app.go
index 048e8d9b3c3..a9c0c2400e1 100644
--- a/app/app.go
+++ b/app/app.go
@@ -68,7 +68,8 @@ var (
 	}
 )
 
-// custom tx codec
+// MakeCodec creates the application codec. The codec is sealed before it is
+// returned.
 func MakeCodec() *codec.Codec {
 	var cdc = codec.New()
 
@@ -77,10 +78,10 @@ func MakeCodec() *codec.Codec {
 	codec.RegisterCrypto(cdc)
 	codec.RegisterEvidences(cdc)
 
-	return cdc
+	return cdc.Seal()
 }
 
-// Extended ABCI application
+// GaiaApp extended ABCI application
 type GaiaApp struct {
 	*bam.BaseApp
 	cdc *codec.Codec
@@ -105,6 +106,9 @@ type GaiaApp struct {
 
 	// the module manager
 	mm *module.Manager
+
+	// simulation manager
+	sm *module.SimulationManager
 }
 
 // NewGaiaApp returns a reference to an initialized GaiaApp.
@@ -188,7 +192,7 @@ func NewGaiaApp(logger log.Logger, db dbm.DB, traceStore io.Writer, loadLatest b
 		gov.NewAppModule(app.govKeeper, app.supplyKeeper),
 		mint.NewAppModule(app.mintKeeper),
 		slashing.NewAppModule(app.slashingKeeper, app.stakingKeeper),
-		staking.NewAppModule(app.stakingKeeper, app.distrKeeper, app.accountKeeper, app.supplyKeeper),
+		staking.NewAppModule(app.stakingKeeper, app.accountKeeper, app.supplyKeeper),
 	)
 
 	// During begin block slashing happens after distr.BeginBlocker so that
@@ -209,6 +213,24 @@ func NewGaiaApp(logger log.Logger, db dbm.DB, traceStore io.Writer, loadLatest b
 	app.mm.RegisterInvariants(&app.crisisKeeper)
 	app.mm.RegisterRoutes(app.Router(), app.QueryRouter())
 
+	// create the simulation manager and define the order of the modules for deterministic simulations
+	//
+	// NOTE: This is not required for apps that don't use the simulator for fuzz testing
+	// transactions.
+	app.sm = module.NewSimulationManager(
+		genaccounts.NewAppModule(app.accountKeeper),
+		auth.NewAppModule(app.accountKeeper),
+		bank.NewAppModule(app.bankKeeper, app.accountKeeper),
+		supply.NewAppModule(app.supplyKeeper, app.accountKeeper),
+		gov.NewAppModule(app.govKeeper, app.supplyKeeper),
+		mint.NewAppModule(app.mintKeeper),
+		distr.NewAppModule(app.distrKeeper, app.supplyKeeper),
+		staking.NewAppModule(app.stakingKeeper, app.accountKeeper, app.supplyKeeper),
+		slashing.NewAppModule(app.slashingKeeper, app.stakingKeeper),
+	)
+
+	app.sm.RegisterStoreDecoders()
+
 	// initialize stores
 	app.MountKVStores(keys)
 	app.MountTransientStores(tkeys)
@@ -261,3 +283,17 @@ func (app *GaiaApp) ModuleAccountAddrs() map[string]bool {
 
 	return modAccAddrs
 }
+
+// Codec returns the application's sealed codec.
+func (app *GaiaApp) Codec() *codec.Codec {
+	return app.cdc
+}
+
+// GetMaccPerms returns a mapping of the application's module account permissions.
+func GetMaccPerms() map[string][]string {
+	modAccPerms := make(map[string][]string)
+	for k, v := range maccPerms {
+		modAccPerms[k] = v
+	}
+	return modAccPerms
+}
diff --git a/app/app_test.go b/app/app_test.go
index 2e8f877b53f..1388fe02e31 100644
--- a/app/app_test.go
+++ b/app/app_test.go
@@ -6,7 +6,7 @@ import (
 
 	"github.com/stretchr/testify/require"
 	"github.com/tendermint/tendermint/libs/log"
-	"github.com/tendermint/tm-db"
+	db "github.com/tendermint/tm-db"
 
 	"github.com/cosmos/cosmos-sdk/codec"
 	"github.com/cosmos/cosmos-sdk/simapp"
@@ -36,7 +36,6 @@ func TestBlackListedAddrs(t *testing.T) {
 }
 
 func setGenesis(gapp *GaiaApp) error {
-
 	genesisState := simapp.NewDefaultGenesisState()
 	stateBytes, err := codec.MarshalJSONIndent(gapp.cdc, genesisState)
 	if err != nil {
@@ -50,6 +49,7 @@ func setGenesis(gapp *GaiaApp) error {
 			AppStateBytes: stateBytes,
 		},
 	)
+
 	gapp.Commit()
 	return nil
 }
diff --git a/app/export.go b/app/export.go
index 9d312bce626..f8e7e7490c6 100644
--- a/app/export.go
+++ b/app/export.go
@@ -13,7 +13,7 @@ import (
 	"github.com/cosmos/cosmos-sdk/x/staking"
 )
 
-// export the state of gaia for a genesis file
+// ExportAppStateAndValidators export the state of gaia for a genesis file
 func (app *GaiaApp) ExportAppStateAndValidators(forZeroHeight bool, jailWhiteList []string,
 ) (appState json.RawMessage, validators []tmtypes.GenesisValidator, err error) {
 	// as if they could withdraw from the start of the next block
diff --git a/app/sim_test.go b/app/sim_test.go
index 14f1bbd9466..00273beed9a 100644
--- a/app/sim_test.go
+++ b/app/sim_test.go
@@ -2,14 +2,11 @@ package app
 
 import (
 	"encoding/json"
-	"flag"
 	"fmt"
-	"io"
 	"io/ioutil"
 	"math/rand"
 	"os"
 	"testing"
-	"time"
 
 	"github.com/stretchr/testify/require"
 
@@ -19,358 +16,242 @@ import (
 
 	"github.com/cosmos/cosmos-sdk/baseapp"
 	"github.com/cosmos/cosmos-sdk/simapp"
+	"github.com/cosmos/cosmos-sdk/store"
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	"github.com/cosmos/cosmos-sdk/x/auth"
-	authsim "github.com/cosmos/cosmos-sdk/x/auth/simulation"
-	"github.com/cosmos/cosmos-sdk/x/bank"
+	authsimops "github.com/cosmos/cosmos-sdk/x/auth/simulation/operations"
+	banksimops "github.com/cosmos/cosmos-sdk/x/bank/simulation/operations"
 	distr "github.com/cosmos/cosmos-sdk/x/distribution"
-	distrsim "github.com/cosmos/cosmos-sdk/x/distribution/simulation"
+	distrsimops "github.com/cosmos/cosmos-sdk/x/distribution/simulation/operations"
 	"github.com/cosmos/cosmos-sdk/x/gov"
-	govsim "github.com/cosmos/cosmos-sdk/x/gov/simulation"
+	govsimops "github.com/cosmos/cosmos-sdk/x/gov/simulation/operations"
 	"github.com/cosmos/cosmos-sdk/x/mint"
 	"github.com/cosmos/cosmos-sdk/x/params"
-	paramsim "github.com/cosmos/cosmos-sdk/x/params/simulation"
+	paramsimops "github.com/cosmos/cosmos-sdk/x/params/simulation/operations"
 	"github.com/cosmos/cosmos-sdk/x/simulation"
 	"github.com/cosmos/cosmos-sdk/x/slashing"
-	slashingsim "github.com/cosmos/cosmos-sdk/x/slashing/simulation"
+	slashingsimops "github.com/cosmos/cosmos-sdk/x/slashing/simulation/operations"
 	"github.com/cosmos/cosmos-sdk/x/staking"
-	stakingsim "github.com/cosmos/cosmos-sdk/x/staking/simulation"
+	stakingsimops "github.com/cosmos/cosmos-sdk/x/staking/simulation/operations"
 	"github.com/cosmos/cosmos-sdk/x/supply"
 )
 
 func init() {
-	flag.StringVar(&genesisFile, "Genesis", "", "custom simulation genesis file; cannot be used with params file")
-	flag.StringVar(&paramsFile, "Params", "", "custom simulation params file which overrides any random params; cannot be used with genesis")
-	flag.StringVar(&exportParamsPath, "ExportParamsPath", "", "custom file path to save the exported params JSON")
-	flag.IntVar(&exportParamsHeight, "ExportParamsHeight", 0, "height to which export the randomly generated params")
-	flag.StringVar(&exportStatePath, "ExportStatePath", "", "custom file path to save the exported app state JSON")
-	flag.StringVar(&exportStatsPath, "ExportStatsPath", "", "custom file path to save the exported simulation statistics JSON")
-	flag.Int64Var(&seed, "Seed", 42, "simulation random seed")
-	flag.IntVar(&initialBlockHeight, "InitialBlockHeight", 1, "initial block to start the simulation")
-	flag.IntVar(&numBlocks, "NumBlocks", 500, "number of new blocks to simulate from the initial block height")
-	flag.IntVar(&blockSize, "BlockSize", 200, "operations per block")
-	flag.BoolVar(&enabled, "Enabled", false, "enable the simulation")
-	flag.BoolVar(&verbose, "Verbose", false, "verbose log output")
-	flag.BoolVar(&lean, "Lean", false, "lean simulation log output")
-	flag.BoolVar(&commit, "Commit", false, "have the simulation commit")
-	flag.IntVar(&period, "Period", 1, "run slow invariants only once every period assertions")
-	flag.BoolVar(&onOperation, "SimulateEveryOperation", false, "run slow invariants every operation")
-	flag.BoolVar(&allInvariants, "PrintAllInvariants", false, "print all invariants if a broken invariant is found")
-	flag.Int64Var(&genesisTime, "GenesisTime", 0, "override genesis UNIX time instead of using a random UNIX time")
+	simapp.GetSimulatorFlags()
 }
 
-// helper function for populating input for SimulateFromSeed
-func getSimulateFromSeedInput(tb testing.TB, w io.Writer, app *GaiaApp) (
-	testing.TB, io.Writer, *baseapp.BaseApp, simulation.AppStateFn, int64,
-	simulation.WeightedOperations, sdk.Invariants, int, int, int, int, string,
-	bool, bool, bool, bool, bool, map[string]bool) {
-
-	exportParams := exportParamsPath != ""
-
-	return tb, w, app.BaseApp, appStateFn, seed,
-		testAndRunTxs(app), invariants(app),
-		initialBlockHeight, numBlocks, exportParamsHeight, blockSize,
-		exportStatsPath, exportParams, commit, lean, onOperation, allInvariants, app.ModuleAccountAddrs()
-}
-
-func appStateFn(
-	r *rand.Rand, accs []simulation.Account,
-) (appState json.RawMessage, simAccs []simulation.Account, chainID string, genesisTimestamp time.Time) {
-
-	cdc := MakeCodec()
-
-	if genesisTime == 0 {
-		genesisTimestamp = simulation.RandTimestamp(r)
-	} else {
-		genesisTimestamp = time.Unix(genesisTime, 0)
-	}
-
-	switch {
-	case paramsFile != "" && genesisFile != "":
-		panic("cannot provide both a genesis file and a params file")
-
-	case genesisFile != "":
-		appState, simAccs, chainID = simapp.AppStateFromGenesisFileFn(r, accs, genesisTimestamp)
-
-	case paramsFile != "":
-		appParams := make(simulation.AppParams)
-		bz, err := ioutil.ReadFile(paramsFile)
-		if err != nil {
-			panic(err)
-		}
-
-		cdc.MustUnmarshalJSON(bz, &appParams)
-		appState, simAccs, chainID = appStateRandomizedFn(r, accs, genesisTimestamp, appParams)
-
-	default:
-		appParams := make(simulation.AppParams)
-		appState, simAccs, chainID = appStateRandomizedFn(r, accs, genesisTimestamp, appParams)
-	}
-
-	return appState, simAccs, chainID, genesisTimestamp
-}
-
-// TODO refactor out random initialization code to the modules
-func appStateRandomizedFn(
-	r *rand.Rand, accs []simulation.Account, genesisTimestamp time.Time, appParams simulation.AppParams,
-) (json.RawMessage, []simulation.Account, string) {
-
-	cdc := MakeCodec()
-	genesisState := simapp.NewDefaultGenesisState()
-
-	var (
-		amount             int64
-		numInitiallyBonded int64
-	)
-
-	appParams.GetOrGenerate(cdc, StakePerAccount, &amount, r,
-		func(r *rand.Rand) { amount = int64(r.Intn(1e12)) })
-	appParams.GetOrGenerate(cdc, InitiallyBondedValidators, &amount, r,
-		func(r *rand.Rand) { numInitiallyBonded = int64(r.Intn(250)) })
-
-	numAccs := int64(len(accs))
-	if numInitiallyBonded > numAccs {
-		numInitiallyBonded = numAccs
-	}
-
-	fmt.Printf(
-		`Selected randomly generated parameters for simulated genesis:
-{
-  stake_per_account: "%v",
-  initially_bonded_validators: "%v"
-}
-`, amount, numInitiallyBonded,
-	)
-
-	simapp.GenGenesisAccounts(cdc, r, accs, genesisTimestamp, amount, numInitiallyBonded, genesisState)
-	simapp.GenAuthGenesisState(cdc, r, appParams, genesisState)
-	simapp.GenBankGenesisState(cdc, r, appParams, genesisState)
-	simapp.GenSupplyGenesisState(cdc, amount, numInitiallyBonded, int64(len(accs)), genesisState)
-	simapp.GenGovGenesisState(cdc, r, appParams, genesisState)
-	simapp.GenMintGenesisState(cdc, r, appParams, genesisState)
-	simapp.GenDistrGenesisState(cdc, r, appParams, genesisState)
-	stakingGen := simapp.GenStakingGenesisState(cdc, r, accs, amount, numAccs, numInitiallyBonded, appParams, genesisState)
-	simapp.GenSlashingGenesisState(cdc, r, stakingGen, appParams, genesisState)
-
-	appState, err := MakeCodec().MarshalJSON(genesisState)
-	if err != nil {
-		panic(err)
-	}
-
-	return appState, accs, "simulation"
-}
-
-func testAndRunTxs(app *GaiaApp) []simulation.WeightedOperation {
-	cdc := MakeCodec()
+func testAndRunTxs(app *GaiaApp, config simulation.Config) []simulation.WeightedOperation {
 	ap := make(simulation.AppParams)
 
-	if paramsFile != "" {
-		bz, err := ioutil.ReadFile(paramsFile)
+	paramChanges := app.sm.GenerateParamChanges(config.Seed)
+
+	if config.ParamsFile != "" {
+		bz, err := ioutil.ReadFile(config.ParamsFile)
 		if err != nil {
 			panic(err)
 		}
 
-		cdc.MustUnmarshalJSON(bz, &ap)
+		app.cdc.MustUnmarshalJSON(bz, &ap)
 	}
 
+	// nolint: govet
 	return []simulation.WeightedOperation{
 		{
 			func(_ *rand.Rand) int {
 				var v int
-				ap.GetOrGenerate(cdc, OpWeightDeductFee, &v, nil,
+				ap.GetOrGenerate(app.cdc, OpWeightDeductFee, &v, nil,
 					func(_ *rand.Rand) {
 						v = 5
 					})
 				return v
 			}(nil),
-			authsim.SimulateDeductFee(app.accountKeeper, app.supplyKeeper),
+			authsimops.SimulateDeductFee(app.accountKeeper, app.supplyKeeper),
 		},
 		{
 			func(_ *rand.Rand) int {
 				var v int
-				ap.GetOrGenerate(cdc, OpWeightMsgSend, &v, nil,
+				ap.GetOrGenerate(app.cdc, OpWeightMsgSend, &v, nil,
 					func(_ *rand.Rand) {
 						v = 100
 					})
 				return v
 			}(nil),
-			bank.SimulateMsgSend(app.accountKeeper, app.bankKeeper),
+			banksimops.SimulateMsgSend(app.accountKeeper, app.bankKeeper),
 		},
 		{
 			func(_ *rand.Rand) int {
 				var v int
-				ap.GetOrGenerate(cdc, OpWeightSingleInputMsgMultiSend, &v, nil,
+				ap.GetOrGenerate(app.cdc, OpWeightSingleInputMsgMultiSend, &v, nil,
 					func(_ *rand.Rand) {
 						v = 10
 					})
 				return v
 			}(nil),
-			bank.SimulateSingleInputMsgMultiSend(app.accountKeeper, app.bankKeeper),
+			banksimops.SimulateSingleInputMsgMultiSend(app.accountKeeper, app.bankKeeper),
 		},
 		{
 			func(_ *rand.Rand) int {
 				var v int
-				ap.GetOrGenerate(cdc, OpWeightMsgSetWithdrawAddress, &v, nil,
+				ap.GetOrGenerate(app.cdc, OpWeightMsgSetWithdrawAddress, &v, nil,
 					func(_ *rand.Rand) {
 						v = 50
 					})
 				return v
 			}(nil),
-			distrsim.SimulateMsgSetWithdrawAddress(app.accountKeeper, app.distrKeeper),
+			distrsimops.SimulateMsgSetWithdrawAddress(app.distrKeeper),
 		},
 		{
 			func(_ *rand.Rand) int {
 				var v int
-				ap.GetOrGenerate(cdc, OpWeightMsgWithdrawDelegationReward, &v, nil,
+				ap.GetOrGenerate(app.cdc, OpWeightMsgWithdrawDelegationReward, &v, nil,
 					func(_ *rand.Rand) {
 						v = 50
 					})
 				return v
 			}(nil),
-			distrsim.SimulateMsgWithdrawDelegatorReward(app.accountKeeper, app.distrKeeper),
+			distrsimops.SimulateMsgWithdrawDelegatorReward(app.distrKeeper),
 		},
 		{
 			func(_ *rand.Rand) int {
 				var v int
-				ap.GetOrGenerate(cdc, OpWeightMsgWithdrawValidatorCommission, &v, nil,
+				ap.GetOrGenerate(app.cdc, OpWeightMsgWithdrawValidatorCommission, &v, nil,
 					func(_ *rand.Rand) {
 						v = 50
 					})
 				return v
 			}(nil),
-			distrsim.SimulateMsgWithdrawValidatorCommission(app.accountKeeper, app.distrKeeper),
+			distrsimops.SimulateMsgWithdrawValidatorCommission(app.distrKeeper),
 		},
 		{
 			func(_ *rand.Rand) int {
 				var v int
-				ap.GetOrGenerate(cdc, OpWeightSubmitVotingSlashingTextProposal, &v, nil,
+				ap.GetOrGenerate(app.cdc, OpWeightSubmitVotingSlashingTextProposal, &v, nil,
 					func(_ *rand.Rand) {
 						v = 5
 					})
 				return v
 			}(nil),
-			govsim.SimulateSubmittingVotingAndSlashingForProposal(app.govKeeper, govsim.SimulateTextProposalContent),
+			govsimops.SimulateSubmittingVotingAndSlashingForProposal(app.govKeeper, govsimops.SimulateTextProposalContent),
 		},
 		{
 			func(_ *rand.Rand) int {
 				var v int
-				ap.GetOrGenerate(cdc, OpWeightSubmitVotingSlashingCommunitySpendProposal, &v, nil,
+				ap.GetOrGenerate(app.cdc, OpWeightSubmitVotingSlashingCommunitySpendProposal, &v, nil,
 					func(_ *rand.Rand) {
 						v = 5
 					})
 				return v
 			}(nil),
-			govsim.SimulateSubmittingVotingAndSlashingForProposal(app.govKeeper, distrsim.SimulateCommunityPoolSpendProposalContent(app.distrKeeper)),
+			govsimops.SimulateSubmittingVotingAndSlashingForProposal(app.govKeeper, distrsimops.SimulateCommunityPoolSpendProposalContent(app.distrKeeper)),
 		},
 		{
 			func(_ *rand.Rand) int {
 				var v int
-				ap.GetOrGenerate(cdc, OpWeightSubmitVotingSlashingParamChangeProposal, &v, nil,
+				ap.GetOrGenerate(app.cdc, OpWeightSubmitVotingSlashingParamChangeProposal, &v, nil,
 					func(_ *rand.Rand) {
 						v = 5
 					})
 				return v
 			}(nil),
-			govsim.SimulateSubmittingVotingAndSlashingForProposal(app.govKeeper, paramsim.SimulateParamChangeProposalContent),
+			govsimops.SimulateSubmittingVotingAndSlashingForProposal(app.govKeeper, paramsimops.SimulateParamChangeProposalContent(paramChanges)),
 		},
 		{
 			func(_ *rand.Rand) int {
 				var v int
-				ap.GetOrGenerate(cdc, OpWeightMsgDeposit, &v, nil,
+				ap.GetOrGenerate(app.cdc, OpWeightMsgDeposit, &v, nil,
 					func(_ *rand.Rand) {
 						v = 100
 					})
 				return v
 			}(nil),
-			govsim.SimulateMsgDeposit(app.govKeeper),
+			govsimops.SimulateMsgDeposit(app.govKeeper),
 		},
 		{
 			func(_ *rand.Rand) int {
 				var v int
-				ap.GetOrGenerate(cdc, OpWeightMsgCreateValidator, &v, nil,
+				ap.GetOrGenerate(app.cdc, OpWeightMsgCreateValidator, &v, nil,
 					func(_ *rand.Rand) {
 						v = 100
 					})
 				return v
 			}(nil),
-			stakingsim.SimulateMsgCreateValidator(app.accountKeeper, app.stakingKeeper),
+			stakingsimops.SimulateMsgCreateValidator(app.accountKeeper, app.stakingKeeper),
 		},
 		{
 			func(_ *rand.Rand) int {
 				var v int
-				ap.GetOrGenerate(cdc, OpWeightMsgEditValidator, &v, nil,
+				ap.GetOrGenerate(app.cdc, OpWeightMsgEditValidator, &v, nil,
 					func(_ *rand.Rand) {
 						v = 5
 					})
 				return v
 			}(nil),
-			stakingsim.SimulateMsgEditValidator(app.stakingKeeper),
+			stakingsimops.SimulateMsgEditValidator(app.stakingKeeper),
 		},
 		{
 			func(_ *rand.Rand) int {
 				var v int
-				ap.GetOrGenerate(cdc, OpWeightMsgDelegate, &v, nil,
+				ap.GetOrGenerate(app.cdc, OpWeightMsgDelegate, &v, nil,
 					func(_ *rand.Rand) {
 						v = 100
 					})
 				return v
 			}(nil),
-			stakingsim.SimulateMsgDelegate(app.accountKeeper, app.stakingKeeper),
+			stakingsimops.SimulateMsgDelegate(app.accountKeeper, app.stakingKeeper),
 		},
 		{
 			func(_ *rand.Rand) int {
 				var v int
-				ap.GetOrGenerate(cdc, OpWeightMsgUndelegate, &v, nil,
+				ap.GetOrGenerate(app.cdc, OpWeightMsgUndelegate, &v, nil,
 					func(_ *rand.Rand) {
 						v = 100
 					})
 				return v
 			}(nil),
-			stakingsim.SimulateMsgUndelegate(app.accountKeeper, app.stakingKeeper),
+			stakingsimops.SimulateMsgUndelegate(app.accountKeeper, app.stakingKeeper),
 		},
 		{
 			func(_ *rand.Rand) int {
 				var v int
-				ap.GetOrGenerate(cdc, OpWeightMsgBeginRedelegate, &v, nil,
+				ap.GetOrGenerate(app.cdc, OpWeightMsgBeginRedelegate, &v, nil,
 					func(_ *rand.Rand) {
 						v = 100
 					})
 				return v
 			}(nil),
-			stakingsim.SimulateMsgBeginRedelegate(app.accountKeeper, app.stakingKeeper),
+			stakingsimops.SimulateMsgBeginRedelegate(app.accountKeeper, app.stakingKeeper),
 		},
 		{
 			func(_ *rand.Rand) int {
 				var v int
-				ap.GetOrGenerate(cdc, OpWeightMsgUnjail, &v, nil,
+				ap.GetOrGenerate(app.cdc, OpWeightMsgUnjail, &v, nil,
 					func(_ *rand.Rand) {
 						v = 100
 					})
 				return v
 			}(nil),
-			slashingsim.SimulateMsgUnjail(app.slashingKeeper),
+			slashingsimops.SimulateMsgUnjail(app.slashingKeeper),
 		},
 	}
 }
 
-func invariants(app *GaiaApp) []sdk.Invariant {
-	// TODO: fix PeriodicInvariants, it doesn't seem to call individual invariants for a period of 1
-	// Ref: https://github.com/cosmos/cosmos-sdk/issues/4631
-	if period == 1 {
-		return app.crisisKeeper.Invariants()
-	}
-	return simulation.PeriodicInvariants(app.crisisKeeper.Invariants(), period, 0)
-}
-
-// Pass this in as an option to use a dbStoreAdapter instead of an IAVLStore for simulation speed.
+// fauxMerkleModeOpt returns a BaseApp option to use a dbStoreAdapter instead of
+// an IAVLStore for faster simulation speed.
 func fauxMerkleModeOpt(bapp *baseapp.BaseApp) {
 	bapp.SetFauxMerkleMode()
 }
 
+// interBlockCacheOpt returns a BaseApp option function that sets the persistent
+// inter-block write-through cache.
+func interBlockCacheOpt() func(*baseapp.BaseApp) {
+	return baseapp.SetInterBlockCache(store.NewCommitKVStoreCacheManager())
+}
+
 // Profile with:
 // /usr/local/go/bin/go test -benchmem -run=^$ github.com/cosmos/cosmos-sdk/GaiaApp -bench ^BenchmarkFullAppSimulation$ -Commit=true -cpuprofile cpu.out
 func BenchmarkFullAppSimulation(b *testing.B) {
 	logger := log.NewNopLogger()
+	config := simapp.NewConfigFromFlags()
 
 	var db dbm.DB
 	dir, _ := ioutil.TempDir("", "goleveldb-app-sim")
@@ -379,37 +260,26 @@ func BenchmarkFullAppSimulation(b *testing.B) {
 		db.Close()
 		_ = os.RemoveAll(dir)
 	}()
-	app := NewGaiaApp(logger, db, nil, true, 0)
+
+	app := NewGaiaApp(logger, db, nil, true, simapp.FlagPeriodValue, interBlockCacheOpt())
 
 	// Run randomized simulation
 	// TODO: parameterize numbers, save for a later PR
-	_, params, simErr := simulation.SimulateFromSeed(getSimulateFromSeedInput(b, os.Stdout, app))
+	_, simParams, simErr := simulation.SimulateFromSeed(
+		b, os.Stdout, app.BaseApp, simapp.AppStateFn(app.Codec(), app.sm),
+		testAndRunTxs(app, config), app.ModuleAccountAddrs(), config,
+	)
 
 	// export state and params before the simulation error is checked
-	if exportStatePath != "" {
-		fmt.Println("Exporting app state...")
-		appState, _, err := app.ExportAppStateAndValidators(false, nil)
-		if err != nil {
-			fmt.Println(err)
-			b.Fail()
-		}
-		err = ioutil.WriteFile(exportStatePath, []byte(appState), 0644)
-		if err != nil {
+	if config.ExportStatePath != "" {
+		if err := ExportStateToJSON(app, config.ExportStatePath); err != nil {
 			fmt.Println(err)
 			b.Fail()
 		}
 	}
 
-	if exportParamsPath != "" {
-		fmt.Println("Exporting simulation params...")
-		paramsBz, err := json.MarshalIndent(params, "", " ")
-		if err != nil {
-			fmt.Println(err)
-			b.Fail()
-		}
-
-		err = ioutil.WriteFile(exportParamsPath, paramsBz, 0644)
-		if err != nil {
+	if config.ExportParamsPath != "" {
+		if err := simapp.ExportParamsToJSON(simParams, config.ExportParamsPath); err != nil {
 			fmt.Println(err)
 			b.Fail()
 		}
@@ -420,7 +290,7 @@ func BenchmarkFullAppSimulation(b *testing.B) {
 		b.FailNow()
 	}
 
-	if commit {
+	if config.Commit {
 		fmt.Println("\nGoLevelDB Stats")
 		fmt.Println(db.Stats()["leveldb.stats"])
 		fmt.Println("GoLevelDB cached block size", db.Stats()["leveldb.cachedblock"])
@@ -428,13 +298,14 @@ func BenchmarkFullAppSimulation(b *testing.B) {
 }
 
 func TestFullAppSimulation(t *testing.T) {
-	if !enabled {
-		t.Skip("Skipping application simulation")
+	if !simapp.FlagEnabledValue {
+		t.Skip("skipping application simulation")
 	}
 
 	var logger log.Logger
+	config := simapp.NewConfigFromFlags()
 
-	if verbose {
+	if simapp.FlagVerboseValue {
 		logger = log.TestingLogger()
 	} else {
 		logger = log.NewNopLogger()
@@ -449,35 +320,29 @@ func TestFullAppSimulation(t *testing.T) {
 		_ = os.RemoveAll(dir)
 	}()
 
-	app := NewGaiaApp(logger, db, nil, true, 0, fauxMerkleModeOpt)
+	app := NewGaiaApp(logger, db, nil, true, simapp.FlagPeriodValue, fauxMerkleModeOpt)
 	require.Equal(t, "GaiaApp", app.Name())
 
 	// Run randomized simulation
-	_, params, simErr := simulation.SimulateFromSeed(getSimulateFromSeedInput(t, os.Stdout, app))
+	_, simParams, simErr := simulation.SimulateFromSeed(
+		t, os.Stdout, app.BaseApp, simapp.AppStateFn(app.Codec(), app.sm),
+		testAndRunTxs(app, config), app.ModuleAccountAddrs(), config,
+	)
 
 	// export state and params before the simulation error is checked
-	if exportStatePath != "" {
-		fmt.Println("Exporting app state...")
-		appState, _, err := app.ExportAppStateAndValidators(false, nil)
-		require.NoError(t, err)
-
-		err = ioutil.WriteFile(exportStatePath, []byte(appState), 0644)
+	if config.ExportStatePath != "" {
+		err := ExportStateToJSON(app, config.ExportStatePath)
 		require.NoError(t, err)
 	}
 
-	if exportParamsPath != "" {
-		fmt.Println("Exporting simulation params...")
-		fmt.Println(params)
-		paramsBz, err := json.MarshalIndent(params, "", " ")
-		require.NoError(t, err)
-
-		err = ioutil.WriteFile(exportParamsPath, paramsBz, 0644)
+	if config.ExportParamsPath != "" {
+		err := simapp.ExportParamsToJSON(simParams, config.ExportParamsPath)
 		require.NoError(t, err)
 	}
 
 	require.NoError(t, simErr)
 
-	if commit {
+	if config.Commit {
 		// for memdb:
 		// fmt.Println("Database Size", db.Stats()["database.size"])
 		fmt.Println("\nGoLevelDB Stats")
@@ -487,12 +352,14 @@ func TestFullAppSimulation(t *testing.T) {
 }
 
 func TestAppImportExport(t *testing.T) {
-	if !enabled {
-		t.Skip("Skipping application import/export simulation")
+	if !simapp.FlagEnabledValue {
+		t.Skip("skipping application import/export simulation")
 	}
 
 	var logger log.Logger
-	if verbose {
+	config := simapp.NewConfigFromFlags()
+
+	if simapp.FlagVerboseValue {
 		logger = log.TestingLogger()
 	} else {
 		logger = log.NewNopLogger()
@@ -507,34 +374,29 @@ func TestAppImportExport(t *testing.T) {
 		_ = os.RemoveAll(dir)
 	}()
 
-	app := NewGaiaApp(logger, db, nil, true, 0, fauxMerkleModeOpt)
+	app := NewGaiaApp(logger, db, nil, true, simapp.FlagPeriodValue, fauxMerkleModeOpt)
 	require.Equal(t, "SimApp", app.Name())
 
 	// Run randomized simulation
-	_, simParams, simErr := simulation.SimulateFromSeed(getSimulateFromSeedInput(t, os.Stdout, app))
+	_, simParams, simErr := simulation.SimulateFromSeed(
+		t, os.Stdout, app.BaseApp, simapp.AppStateFn(app.Codec(), app.sm),
+		testAndRunTxs(app, config), app.ModuleAccountAddrs(), config,
+	)
 
 	// export state and simParams before the simulation error is checked
-	if exportStatePath != "" {
-		fmt.Println("Exporting app state...")
-		appState, _, err := app.ExportAppStateAndValidators(false, nil)
-		require.NoError(t, err)
-
-		err = ioutil.WriteFile(exportStatePath, []byte(appState), 0644)
+	if config.ExportStatePath != "" {
+		err := ExportStateToJSON(app, config.ExportStatePath)
 		require.NoError(t, err)
 	}
 
-	if exportParamsPath != "" {
-		fmt.Println("Exporting simulation params...")
-		simParamsBz, err := json.MarshalIndent(simParams, "", " ")
-		require.NoError(t, err)
-
-		err = ioutil.WriteFile(exportParamsPath, simParamsBz, 0644)
+	if config.ExportParamsPath != "" {
+		err := simapp.ExportParamsToJSON(simParams, config.ExportParamsPath)
 		require.NoError(t, err)
 	}
 
 	require.NoError(t, simErr)
 
-	if commit {
+	if config.Commit {
 		// for memdb:
 		// fmt.Println("Database Size", db.Stats()["database.size"])
 		fmt.Println("\nGoLevelDB Stats")
@@ -542,11 +404,11 @@ func TestAppImportExport(t *testing.T) {
 		fmt.Println("GoLevelDB cached block size", db.Stats()["leveldb.cachedblock"])
 	}
 
-	fmt.Printf("Exporting genesis...\n")
+	fmt.Printf("exporting genesis...\n")
 
 	appState, _, err := app.ExportAppStateAndValidators(false, []string{})
 	require.NoError(t, err)
-	fmt.Printf("Importing genesis...\n")
+	fmt.Printf("importing genesis...\n")
 
 	newDir, _ := ioutil.TempDir("", "goleveldb-app-sim-2")
 	newDB, _ := sdk.NewLevelDB("Simulation-2", dir)
@@ -556,19 +418,17 @@ func TestAppImportExport(t *testing.T) {
 		_ = os.RemoveAll(newDir)
 	}()
 
-	newApp := NewGaiaApp(log.NewNopLogger(), newDB, nil, true, 0, fauxMerkleModeOpt)
+	newApp := NewGaiaApp(log.NewNopLogger(), newDB, nil, true, simapp.FlagPeriodValue, fauxMerkleModeOpt)
 	require.Equal(t, "SimApp", newApp.Name())
 
 	var genesisState simapp.GenesisState
 	err = app.cdc.UnmarshalJSON(appState, &genesisState)
-	if err != nil {
-		panic(err)
-	}
+	require.NoError(t, err)
 
 	ctxB := newApp.NewContext(true, abci.Header{Height: app.LastBlockHeight()})
 	newApp.mm.InitGenesis(ctxB, genesisState)
 
-	fmt.Printf("Comparing stores...\n")
+	fmt.Printf("comparing stores...\n")
 	ctxA := app.NewContext(true, abci.Header{Height: app.LastBlockHeight()})
 
 	type StoreKeysPrefixes struct {
@@ -596,22 +456,27 @@ func TestAppImportExport(t *testing.T) {
 		storeKeyA := storeKeysPrefix.A
 		storeKeyB := storeKeysPrefix.B
 		prefixes := storeKeysPrefix.Prefixes
+
 		storeA := ctxA.KVStore(storeKeyA)
 		storeB := ctxB.KVStore(storeKeyB)
-		failedKVs := sdk.DiffKVStores(storeA, storeB, prefixes)
-		fmt.Printf("Compared %d key/value pairs between %s and %s\n", len(failedKVs)/2, storeKeyA, storeKeyB)
-		require.Len(t, failedKVs, 0, simapp.GetSimulationLog(storeKeyA.Name(), app.cdc, newApp.cdc, failedKVs))
-	}
 
+		failedKVAs, failedKVBs := sdk.DiffKVStores(storeA, storeB, prefixes)
+		require.Equal(t, len(failedKVAs), len(failedKVBs), "unequal sets of key-values to compare")
+
+		fmt.Printf("compared %d key/value pairs between %s and %s\n", len(failedKVAs), storeKeyA, storeKeyB)
+		require.Len(t, failedKVAs, 0, simapp.GetSimulationLog(storeKeyA.Name(), app.sm.StoreDecoders, app.cdc, failedKVAs, failedKVBs))
+	}
 }
 
 func TestAppSimulationAfterImport(t *testing.T) {
-	if !enabled {
-		t.Skip("Skipping application simulation after import")
+	if !simapp.FlagEnabledValue {
+		t.Skip("skipping application simulation after import")
 	}
 
 	var logger log.Logger
-	if verbose {
+	config := simapp.NewConfigFromFlags()
+
+	if simapp.FlagVerboseValue {
 		logger = log.TestingLogger()
 	} else {
 		logger = log.NewNopLogger()
@@ -625,34 +490,30 @@ func TestAppSimulationAfterImport(t *testing.T) {
 		_ = os.RemoveAll(dir)
 	}()
 
-	app := NewGaiaApp(logger, db, nil, true, 0, fauxMerkleModeOpt)
+	app := NewGaiaApp(logger, db, nil, true, simapp.FlagPeriodValue, fauxMerkleModeOpt)
 	require.Equal(t, "GaiaApp", app.Name())
 
 	// Run randomized simulation
-	stopEarly, params, simErr := simulation.SimulateFromSeed(getSimulateFromSeedInput(t, os.Stdout, app))
+	// Run randomized simulation
+	stopEarly, simParams, simErr := simulation.SimulateFromSeed(
+		t, os.Stdout, app.BaseApp, simapp.AppStateFn(app.Codec(), app.sm),
+		testAndRunTxs(app, config), app.ModuleAccountAddrs(), config,
+	)
 
 	// export state and params before the simulation error is checked
-	if exportStatePath != "" {
-		fmt.Println("Exporting app state...")
-		appState, _, err := app.ExportAppStateAndValidators(false, nil)
-		require.NoError(t, err)
-
-		err = ioutil.WriteFile(exportStatePath, []byte(appState), 0644)
+	if config.ExportStatePath != "" {
+		err := ExportStateToJSON(app, config.ExportStatePath)
 		require.NoError(t, err)
 	}
 
-	if exportParamsPath != "" {
-		fmt.Println("Exporting simulation params...")
-		paramsBz, err := json.MarshalIndent(params, "", " ")
-		require.NoError(t, err)
-
-		err = ioutil.WriteFile(exportParamsPath, paramsBz, 0644)
+	if config.ExportParamsPath != "" {
+		err := simapp.ExportParamsToJSON(simParams, config.ExportParamsPath)
 		require.NoError(t, err)
 	}
 
 	require.NoError(t, simErr)
 
-	if commit {
+	if config.Commit {
 		// for memdb:
 		// fmt.Println("Database Size", db.Stats()["database.size"])
 		fmt.Println("\nGoLevelDB Stats")
@@ -685,103 +546,101 @@ func TestAppSimulationAfterImport(t *testing.T) {
 
 	newApp := NewGaiaApp(log.NewNopLogger(), newDB, nil, true, 0, fauxMerkleModeOpt)
 	require.Equal(t, "GaiaApp", newApp.Name())
+
 	newApp.InitChain(abci.RequestInitChain{
 		AppStateBytes: appState,
 	})
 
 	// Run randomized simulation on imported app
-	_, _, err = simulation.SimulateFromSeed(getSimulateFromSeedInput(t, os.Stdout, newApp))
-	require.Nil(t, err)
+	_, _, err = simulation.SimulateFromSeed(
+		t, os.Stdout, newApp.BaseApp, simapp.AppStateFn(app.Codec(), app.sm),
+		testAndRunTxs(newApp, config), newApp.ModuleAccountAddrs(), config,
+	)
+
+	require.NoError(t, err)
 }
 
 // TODO: Make another test for the fuzzer itself, which just has noOp txs
 // and doesn't depend on the application.
 func TestAppStateDeterminism(t *testing.T) {
-	if !enabled {
-		t.Skip("Skipping application simulation")
+	if !simapp.FlagEnabledValue {
+		t.Skip("skipping application simulation")
 	}
 
+	config := simapp.NewConfigFromFlags()
+	config.InitialBlockHeight = 1
+	config.ExportParamsPath = ""
+	config.OnOperation = false
+	config.AllInvariants = false
+
 	numSeeds := 3
 	numTimesToRunPerSeed := 5
 	appHashList := make([]json.RawMessage, numTimesToRunPerSeed)
 
 	for i := 0; i < numSeeds; i++ {
-		seed := rand.Int63()
+		config.Seed = rand.Int63()
 
 		for j := 0; j < numTimesToRunPerSeed; j++ {
 			logger := log.NewNopLogger()
 			db := dbm.NewMemDB()
-			app := NewGaiaApp(logger, db, nil, true, 0)
+			app := NewGaiaApp(logger, db, nil, true, simapp.FlagPeriodValue, interBlockCacheOpt())
 
 			fmt.Printf(
-				"Running non-determinism simulation; seed: %d/%d (%d), attempt: %d/%d\n",
-				i+1, numSeeds, seed, j+1, numTimesToRunPerSeed,
+				"running non-determinism simulation; seed %d: %d/%d, attempt: %d/%d\n",
+				config.Seed, i+1, numSeeds, j+1, numTimesToRunPerSeed,
 			)
 
-			// Run randomized simulation
 			_, _, err := simulation.SimulateFromSeed(
-				t, os.Stdout, app.BaseApp, appStateFn, seed, testAndRunTxs(app),
-				[]sdk.Invariant{}, 1, numBlocks, exportParamsHeight,
-				blockSize, "", false, commit, lean,
-				false, false, app.ModuleAccountAddrs(),
+				t, os.Stdout, app.BaseApp, simapp.AppStateFn(app.Codec(), app.sm),
+				testAndRunTxs(app, config), app.ModuleAccountAddrs(), config,
 			)
 			require.NoError(t, err)
 
 			appHash := app.LastCommitID().Hash
 			appHashList[j] = appHash
-		}
 
-		for k := 1; k < numTimesToRunPerSeed; k++ {
-			require.Equal(t, appHashList[0], appHashList[k], "appHash list: %v", appHashList)
+			if j != 0 {
+				require.Equal(
+					t, appHashList[0], appHashList[j],
+					"non-determinism in seed %d: %d/%d, attempt: %d/%d\n", config.Seed, i+1, numSeeds, j+1, numTimesToRunPerSeed,
+				)
+			}
 		}
 	}
 }
 
 func BenchmarkInvariants(b *testing.B) {
 	logger := log.NewNopLogger()
+
+	config := simapp.NewConfigFromFlags()
+	config.AllInvariants = false
+
 	dir, _ := ioutil.TempDir("", "goleveldb-app-invariant-bench")
 	db, _ := sdk.NewLevelDB("simulation", dir)
 
 	defer func() {
 		db.Close()
-		_ = os.RemoveAll(dir)
+		os.RemoveAll(dir)
 	}()
 
-	app := NewGaiaApp(logger, db, nil, true, 0)
-	exportParams := exportParamsPath != ""
+	app := NewGaiaApp(logger, db, nil, true, simapp.FlagPeriodValue, interBlockCacheOpt())
 
 	// 2. Run parameterized simulation (w/o invariants)
-	_, params, simErr := simulation.SimulateFromSeed(
-		b, ioutil.Discard, app.BaseApp, appStateFn, seed, testAndRunTxs(app),
-		[]sdk.Invariant{}, initialBlockHeight, numBlocks, exportParamsHeight, blockSize,
-		exportStatsPath, exportParams, commit, lean, onOperation, false, app.ModuleAccountAddrs(),
+	_, simParams, simErr := simulation.SimulateFromSeed(
+		b, ioutil.Discard, app.BaseApp, simapp.AppStateFn(app.Codec(), app.sm),
+		testAndRunTxs(app, config), app.ModuleAccountAddrs(), config,
 	)
 
 	// export state and params before the simulation error is checked
-	if exportStatePath != "" {
-		fmt.Println("Exporting app state...")
-		appState, _, err := app.ExportAppStateAndValidators(false, nil)
-		if err != nil {
-			fmt.Println(err)
-			b.Fail()
-		}
-		err = ioutil.WriteFile(exportStatePath, []byte(appState), 0644)
-		if err != nil {
+	if config.ExportStatePath != "" {
+		if err := ExportStateToJSON(app, config.ExportStatePath); err != nil {
 			fmt.Println(err)
 			b.Fail()
 		}
 	}
 
-	if exportParamsPath != "" {
-		fmt.Println("Exporting simulation params...")
-		paramsBz, err := json.MarshalIndent(params, "", " ")
-		if err != nil {
-			fmt.Println(err)
-			b.Fail()
-		}
-
-		err = ioutil.WriteFile(exportParamsPath, paramsBz, 0644)
-		if err != nil {
+	if config.ExportParamsPath != "" {
+		if err := simapp.ExportParamsToJSON(simParams, config.ExportParamsPath); err != nil {
 			fmt.Println(err)
 			b.Fail()
 		}
@@ -801,7 +660,7 @@ func BenchmarkInvariants(b *testing.B) {
 	for _, cr := range app.crisisKeeper.Routes() {
 		b.Run(fmt.Sprintf("%s/%s", cr.ModuleName, cr.Route), func(b *testing.B) {
 			if res, stop := cr.Invar(ctx); stop {
-				fmt.Printf("broken invariant at block %d of %d\n%s", ctx.BlockHeight()-1, numBlocks, res)
+				fmt.Printf("broken invariant at block %d of %d\n%s", ctx.BlockHeight()-1, config.NumBlocks, res)
 				b.FailNow()
 			}
 		})
diff --git a/app/utils.go b/app/utils.go
index d6dbfe37d3d..6f9350e1b7f 100644
--- a/app/utils.go
+++ b/app/utils.go
@@ -2,38 +2,29 @@
 package app
 
 import (
+	"fmt"
 	"io"
+	"io/ioutil"
 
 	"github.com/tendermint/tendermint/libs/log"
 	dbm "github.com/tendermint/tm-db"
 
 	"github.com/cosmos/cosmos-sdk/baseapp"
+	bam "github.com/cosmos/cosmos-sdk/baseapp"
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	"github.com/cosmos/cosmos-sdk/x/staking"
 )
 
-var (
-	genesisFile        string
-	paramsFile         string
-	exportParamsPath   string
-	exportParamsHeight int
-	exportStatePath    string
-	exportStatsPath    string
-	seed               int64
-	initialBlockHeight int
-	numBlocks          int
-	blockSize          int
-	enabled            bool
-	verbose            bool
-	lean               bool
-	commit             bool
-	period             int
-	onOperation        bool // TODO Remove in favor of binary search for invariant violation
-	allInvariants      bool
-	genesisTime        int64
-)
+// ExportStateToJSON util function to export the app state to JSON
+func ExportStateToJSON(app *GaiaApp, path string) error {
+	fmt.Println("exporting app state...")
+	appState, _, err := app.ExportAppStateAndValidators(false, nil)
+	if err != nil {
+		return err
+	}
 
-// DONTCOVER
+	return ioutil.WriteFile(path, []byte(appState), 0644)
+}
 
 // NewGaiaAppUNSAFE is used for debugging purposes only.
 //
@@ -43,5 +34,5 @@ func NewGaiaAppUNSAFE(logger log.Logger, db dbm.DB, traceStore io.Writer, loadLa
 ) (gapp *GaiaApp, keyMain, keyStaking *sdk.KVStoreKey, stakingKeeper staking.Keeper) {
 
 	gapp = NewGaiaApp(logger, db, traceStore, loadLatest, invCheckPeriod, baseAppOptions...)
-	return gapp, gapp.keys[baseapp.MainStoreKey], gapp.keys[staking.StoreKey], gapp.stakingKeeper
+	return gapp, gapp.keys[bam.MainStoreKey], gapp.keys[staking.StoreKey], gapp.stakingKeeper
 }
diff --git a/cli_test/test_helpers.go b/cli_test/test_helpers.go
index c7ae1680a8f..43c2716f787 100644
--- a/cli_test/test_helpers.go
+++ b/cli_test/test_helpers.go
@@ -555,7 +555,7 @@ func (f *Fixtures) QueryGovParamTallying() gov.TallyParams {
 func (f *Fixtures) QueryGovProposals(flags ...string) gov.Proposals {
 	cmd := fmt.Sprintf("%s query gov proposals %v", f.GaiacliBinary, f.Flags())
 	stdout, stderr := tests.ExecuteT(f.T, addFlags(cmd, flags), "")
-	if strings.Contains(stderr, "No matching proposals found") {
+	if strings.Contains(stderr, "no matching proposals found") {
 		return gov.Proposals{}
 	}
 	require.Empty(f.T, stderr)
diff --git a/cmd/gaiad/main.go b/cmd/gaiad/main.go
index 4564b23afba..bc442fc720a 100644
--- a/cmd/gaiad/main.go
+++ b/cmd/gaiad/main.go
@@ -72,11 +72,19 @@ func main() {
 }
 
 func newApp(logger log.Logger, db dbm.DB, traceStore io.Writer) abci.Application {
+	var cache sdk.MultiStorePersistentCache
+
+	if viper.GetBool(server.FlagInterBlockCache) {
+		cache = store.NewCommitKVStoreCacheManager()
+	}
+
 	return app.NewGaiaApp(
 		logger, db, traceStore, true, invCheckPeriod,
 		baseapp.SetPruning(store.NewPruningOptionsFromString(viper.GetString("pruning"))),
 		baseapp.SetMinGasPrices(viper.GetString(server.FlagMinGasPrices)),
-		baseapp.SetHaltHeight(uint64(viper.GetInt(server.FlagHaltHeight))),
+		baseapp.SetHaltHeight(viper.GetUint64(server.FlagHaltHeight)),
+		baseapp.SetHaltTime(viper.GetUint64(server.FlagHaltTime)),
+		baseapp.SetInterBlockCache(cache),
 	)
 }
 
diff --git a/contrib/devtools/Makefile b/contrib/devtools/Makefile
index a5a8c5ef8f6..c329690a7f4 100644
--- a/contrib/devtools/Makefile
+++ b/contrib/devtools/Makefile
@@ -61,7 +61,7 @@ $(GOIMPORTS):
 	go get golang.org/x/tools/cmd/goimports@v0.0.0-20190628034336-212fb13d595e
 
 $(RUNSIM):
-	go get github.com/cosmos/tools/cmd/runsim/
+	go install github.com/cosmos/tools/cmd/runsim/
 
 golangci-lint: $(GOLANGCI_LINT)
 
diff --git a/go.mod b/go.mod
index 8e7df884710..7734d017f8e 100644
--- a/go.mod
+++ b/go.mod
@@ -1,24 +1,19 @@
 module github.com/cosmos/gaia
 
-go 1.12
+go 1.13
 
 require (
 	github.com/btcsuite/btcd v0.0.0-20190807005414-4063feeff79a // indirect
-	github.com/cosmos/cosmos-sdk v0.28.2-0.20190813160135-f90d969ded97
+	github.com/cosmos/cosmos-sdk v0.34.4-0.20190910181238-84627faf79eb
 	github.com/cosmos/go-bip39 v0.0.0-20180819234021-555e2067c45d // indirect
 	github.com/go-kit/kit v0.9.0 // indirect
 	github.com/golang/mock v1.3.1 // indirect
-	github.com/gorilla/mux v1.7.3 // indirect
 	github.com/libp2p/go-buffer-pool v0.0.2 // indirect
 	github.com/magiconair/properties v1.8.1 // indirect
-	github.com/mattn/go-isatty v0.0.8 // indirect
-	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
-	github.com/modern-go/reflect2 v1.0.1 // indirect
 	github.com/onsi/ginkgo v1.8.0 // indirect
 	github.com/onsi/gomega v1.5.0 // indirect
 	github.com/otiai10/copy v1.0.1
 	github.com/otiai10/curr v0.0.0-20190513014714-f5a3d24e5776 // indirect
-	github.com/pelletier/go-toml v1.4.0 // indirect
 	github.com/pkg/errors v0.8.1
 	github.com/prometheus/client_golang v1.1.0 // indirect
 	github.com/rcrowley/go-metrics v0.0.0-20190706150252-9beb055b7962 // indirect
@@ -27,15 +22,13 @@ require (
 	github.com/spf13/afero v1.2.2 // indirect
 	github.com/spf13/cobra v0.0.5
 	github.com/spf13/viper v1.4.0
-	github.com/stretchr/testify v1.3.0
+	github.com/stretchr/testify v1.4.0
 	github.com/tendermint/go-amino v0.15.0
-	github.com/tendermint/tendermint v0.32.2
+	github.com/tendermint/tendermint v0.32.3
 	github.com/tendermint/tm-db v0.1.1
-	golang.org/x/crypto v0.0.0-20190701094942-4def268fd1a4 // indirect
-	golang.org/x/net v0.0.0-20190724013045-ca1201d0de80 // indirect
-	golang.org/x/sys v0.0.0-20190804053845-51ab0e2deafa // indirect
+	golang.org/x/crypto v0.0.0-20190909091759-094676da4a83 // indirect
+	golang.org/x/net v0.0.0-20190827160401-ba9fcec4b297 // indirect
 	golang.org/x/text v0.3.2 // indirect
-	google.golang.org/appengine v1.4.0 // indirect
 	google.golang.org/genproto v0.0.0-20190801165951-fa694d86fc64 // indirect
 	google.golang.org/grpc v1.22.1 // indirect
 )
diff --git a/go.sum b/go.sum
index e017755f86b..ed5a869f790 100644
--- a/go.sum
+++ b/go.sum
@@ -13,7 +13,6 @@ github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5
 github.com/bartekn/go-bip39 v0.0.0-20171116152956-a05967ea095d h1:1aAija9gr0Hyv4KfQcRcwlmFIrhkDmIj2dz5bkg/s/8=
 github.com/bartekn/go-bip39 v0.0.0-20171116152956-a05967ea095d/go.mod h1:icNx/6QdFblhsEjZehARqbNumymUT/ydwlLojFdv7Sk=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
-github.com/beorn7/perks v1.0.0 h1:HWo1m869IqiPhD389kmkxeTalrjNbbJTC8LXupb+sl0=
 github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
 github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
 github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
@@ -39,8 +38,8 @@ github.com/coreos/go-etcd v2.0.0+incompatible/go.mod h1:Jez6KQU2B/sWsbdaef3ED8Nz
 github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
 github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
 github.com/coreos/pkg v0.0.0-20180928190104-399ea9e2e55f/go.mod h1:E3G3o1h8I7cfcXa63jLwjI0eiQQMgzzUDFVpN/nH/eA=
-github.com/cosmos/cosmos-sdk v0.28.2-0.20190813160135-f90d969ded97 h1:v1/qbsNvfIWMAHEi1GwgBAVCo0NrrrV6uZkSdcIREyU=
-github.com/cosmos/cosmos-sdk v0.28.2-0.20190813160135-f90d969ded97/go.mod h1:RkWDqk5VawCuk6G+Mr7kWkE+1i5oHhxdOriaRibAvPg=
+github.com/cosmos/cosmos-sdk v0.34.4-0.20190910181238-84627faf79eb h1:VKEfR1unkvgquOUgGcuXq6gPXDd7L125MSuCSEmthNM=
+github.com/cosmos/cosmos-sdk v0.34.4-0.20190910181238-84627faf79eb/go.mod h1:De67lt7tcfjIhSv58L/96UEdMvR3GZhOtvHntfEglDA=
 github.com/cosmos/go-bip39 v0.0.0-20180618194314-52158e4697b8/go.mod h1:tSxLoYXyBmiFeKpvmq4dzayMdCjCnu8uqmCysIGBT2Y=
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@@ -53,6 +52,7 @@ github.com/davecgh/go-spew v0.0.0-20171005155431-ecdeabc65495/go.mod h1:J7Y8YcW2
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@@ -74,8 +74,9 @@ github.com/go-logfmt/logfmt v0.4.0/go.mod h1:3RMwSq7FuexP4Kalkev3ejPJsZTpXXBr9+V
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@@ -96,15 +97,17 @@ github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMyw
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@@ -120,6 +123,7 @@ github.com/json-iterator/go v1.1.6/go.mod h1:+SdeFBvtyEkXs7REEP0seUULqWtbJapLOCV
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@@ -130,16 +134,14 @@ github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORN
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@@ -175,9 +177,7 @@ github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINE
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@@ -206,7 +202,6 @@ github.com/rcrowley/go-metrics v0.0.0-20180503174638-e2704e165165/go.mod h1:bCqn
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@@ -237,22 +232,23 @@ github.com/spf13/viper v1.4.0/go.mod h1:PTJ7Z/lr49W6bUbkmS1V3by4uWynFiR9p7+dSq/y
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 github.com/tendermint/tm-db v0.1.1/go.mod h1:0cPKWu2Mou3IlxecH+MEUSYc1Ch537alLe6CpFrKzgw=
 github.com/tmc/grpc-websocket-proxy v0.0.0-20190109142713-0ad062ec5ee5/go.mod h1:ncp9v5uamzpCO7NfCPTXjqaC+bZgJeR0sMTm6dMHP7U=
@@ -274,8 +270,8 @@ golang.org/x/crypto v0.0.0-20181203042331-505ab145d0a9/go.mod h1:6SG95UA2DQfeDnf
 golang.org/x/crypto v0.0.0-20190228161510-8dd112bcdc25/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20190313024323-a1f597ede03a/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
-golang.org/x/crypto v0.0.0-20190701094942-4def268fd1a4 h1:HuIa8hRrWRSrqYzx1qI49NNxhdi2PrY7gxVSq1JjLDc=
-golang.org/x/crypto v0.0.0-20190701094942-4def268fd1a4/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
+golang.org/x/crypto v0.0.0-20190909091759-094676da4a83 h1:mgAKeshyNqWKdENOnQsg+8dRTwZFIwFaO3HNl52sweA=
+golang.org/x/crypto v0.0.0-20190909091759-094676da4a83/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
 golang.org/x/lint v0.0.0-20190227174305-5b3e6a55c961/go.mod h1:wehouNa3lNwaWXcvxsM5YxQ5yQlVC4a0KAMCusXpPoU=
@@ -284,7 +280,6 @@ golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73r
 golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20181114220301-adae6a3d119a/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
-golang.org/x/net v0.0.0-20181201002055-351d144fa1fc/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20181220203305-927f97764cc3/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20190213061140-3a22650c66bd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
@@ -292,8 +287,8 @@ golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn
 golang.org/x/net v0.0.0-20190522155817-f3200d17e092/go.mod h1:HSz+uSET+XFnRR8LxR5pz3Of3rY3CfYBVs4xY44aLks=
 golang.org/x/net v0.0.0-20190613194153-d28f0bde5980/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20190628185345-da137c7871d7/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
-golang.org/x/net v0.0.0-20190724013045-ca1201d0de80 h1:Ao/3l156eZf2AW5wK8a7/smtodRU+gha3+BeqJ69lRk=
-golang.org/x/net v0.0.0-20190724013045-ca1201d0de80/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/net v0.0.0-20190827160401-ba9fcec4b297 h1:k7pJ2yAPLPgbskkFdhRCsA77k2fySZ1zf2zCjvQCiIM=
+golang.org/x/net v0.0.0-20190827160401-ba9fcec4b297/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
@@ -307,21 +302,22 @@ golang.org/x/sys v0.0.0-20181107165924-66b7b1311ac8/go.mod h1:STP8DvDyc/dI5b8T5h
 golang.org/x/sys v0.0.0-20181116152217-5ac8a444bdc5/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20181205085412-a5c9d58dba9a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
-golang.org/x/sys v0.0.0-20190222072716-a9d3bda3a223/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190801041406-cbf593c0f2f3/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20190804053845-51ab0e2deafa h1:KIDDMLT1O0Nr7TSxp8xM5tJcdn8tgyAONntO829og1M=
-golang.org/x/sys v0.0.0-20190804053845-51ab0e2deafa/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a h1:aYOabOQFp6Vj6W1F80affTUvO9UxmJRx8K0gsfABByQ=
+golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.2 h1:tW2bmiBqwgJj/UpqtC8EpXEZVYOwU0yG4iWbprSVAcs=
 golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
 golang.org/x/time v0.0.0-20190308202827-9d24e82272b4/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/tools v0.0.0-20180221164845-07fd8470d635/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+golang.org/x/tools v0.0.0-20181030221726-6c7e314b6563/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20190226205152-f727befe758c/go.mod h1:9Yl7xja0Znq3iFh3HoIrodX9oNMXvdceNzlUR8zjMvY=
 golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
 golang.org/x/tools v0.0.0-20190425150028-36563e24a262/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
+golang.org/x/tools v0.0.0-20190524140312-2c0ae7006135 h1:5Beo0mZN8dRzgrMMkDp0jc8YXQKx9DiJ2k1dkvGsn5A=
 golang.org/x/tools v0.0.0-20190524140312-2c0ae7006135/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
 google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
 google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
@@ -333,7 +329,6 @@ google.golang.org/genproto v0.0.0-20190801165951-fa694d86fc64/go.mod h1:DMBHOl98
 google.golang.org/grpc v1.13.0/go.mod h1:yo6s7OP7yaDglbqo1J04qKzAhqBH6lvTonzMVmEdcZw=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
 google.golang.org/grpc v1.21.0/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
-google.golang.org/grpc v1.22.0 h1:J0UbZOIrCAl+fpTOf8YLs4dJo8L/owV4LYVtAXQoPkw=
 google.golang.org/grpc v1.22.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
 google.golang.org/grpc v1.22.1 h1:/7cs52RnTJmD43s3uxzlq2U7nqVTd/37viQwMrMNlOM=
 google.golang.org/grpc v1.22.1/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
diff --git a/sims.mk b/sims.mk
index 29d2e9b5aa7..2c26332fef7 100644
--- a/sims.mk
+++ b/sims.mk
@@ -3,39 +3,40 @@
 ########################################
 ### Simulations
 
+BINDIR ?= $(GOPATH)/bin
 SIMAPP = github.com/cosmos/gaia/app
 
-sim-gaia-nondeterminism:
+test_sim_nondeterminism:
 	@echo "Running non-determinism test..."
 	@go test -mod=readonly $(SIMAPP) -run TestAppStateDeterminism -Enabled=true \
-		-NumBlocks=100 -BlockSize=200 -Commit=true -v -timeout 24h
+		-NumBlocks=100 -BlockSize=200 -Commit=true -Period=0 -v -timeout 24h
 
-sim-gaia-custom-genesis-fast:
+test_sim_custom_genesis_fast:
 	@echo "Running custom genesis simulation..."
 	@echo "By default, ${HOME}/.gaiad/config/genesis.json will be used."
 	@go test -mod=readonly $(SIMAPP) -run TestFullGaiaSimulation -Genesis=${HOME}/.gaiad/config/genesis.json \
 		-Enabled=true -NumBlocks=100 -BlockSize=200 -Commit=true -Seed=99 -Period=5 -v -timeout 24h
 
-sim-gaia-fast:
-	@echo "Running quick Gaia simulation. This may take several minutes..."
-	@go test -mod=readonly $(SIMAPP) -run TestFullGaiaSimulation -Enabled=true -NumBlocks=100 -BlockSize=200 -Commit=true -Seed=99 -Period=5 -v -timeout 24h
-
-sim-gaia-import-export: runsim
+test_sim_import_export: runsim
 	@echo "Running Gaia import/export simulation. This may take several minutes..."
-	$(GOPATH)/bin/runsim $(SIMAPP) 25 5 TestGaiaImportExport
+	@$(BINDIR)/runsim -Jobs=4 -SimAppPkg=$(SIMAPP) 25 5 TestGaiaImportExport
 
-sim-gaia-simulation-after-import: runsim
+test_sim_after_import: runsim
 	@echo "Running Gaia simulation-after-import. This may take several minutes..."
-	$(GOPATH)/bin/runsim $(SIMAPP) 25 5 TestGaiaSimulationAfterImport
+	@$(BINDIR)/runsim -Jobs=4 -SimAppPkg=$(SIMAPP) 25 5 TestGaiaSimulationAfterImport
 
-sim-gaia-custom-genesis-multi-seed: runsim
+test_sim_custom_genesis_multi_seed: runsim
 	@echo "Running multi-seed custom genesis simulation..."
 	@echo "By default, ${HOME}/.gaiad/config/genesis.json will be used."
-	$(GOPATH)/bin/runsim -g ${HOME}/.gaiad/config/genesis.json 400 5 TestFullGaiaSimulation
+	@$(BINDIR)/runsim -Jobs=4 -Genesis=${HOME}/.gaiad/config/genesis.json 400 5 TestFullGaiaSimulation
+
+test_sim_multi_seed_long: runsim
+	@echo "Running multi-seed application simulation. This may take awhile!"
+	@$(BINDIR)/runsim -Jobs=4 -SimAppPkg=$(SIMAPP) 500 50 TestFullAppSimulation
 
-sim-gaia-multi-seed: runsim
-	@echo "Running multi-seed Gaia simulation. This may take awhile!"
-	$(GOPATH)/bin/runsim $(SIMAPP) 400 5 TestFullGaiaSimulation
+test_sim_multi_seed_short: runsim
+	@echo "Running multi-seed application simulation. This may take awhile!"
+	@$(BINDIR)/runsim -Jobs=4 -SimAppPkg=$(SIMAPP) 50 10 TestFullAppSimulation
 
 sim-benchmark-invariants:
 	@echo "Running simulation invariant benchmarks..."
@@ -46,6 +47,7 @@ sim-benchmark-invariants:
 SIM_NUM_BLOCKS ?= 500
 SIM_BLOCK_SIZE ?= 200
 SIM_COMMIT ?= true
+
 sim-gaia-benchmark:
 	@echo "Running Gaia benchmark for numBlocks=$(SIM_NUM_BLOCKS), blockSize=$(SIM_BLOCK_SIZE). This may take awhile!"
 	@go test -mod=readonly -benchmem -run=^$$ $(SIMAPP) -bench ^BenchmarkFullGaiaSimulation$$  \
@@ -56,7 +58,6 @@ sim-gaia-profile:
 	@go test -mod=readonly -benchmem -run=^$$ $(SIMAPP) -bench ^BenchmarkFullGaiaSimulation$$ \
 		-Enabled=true -NumBlocks=$(SIM_NUM_BLOCKS) -BlockSize=$(SIM_BLOCK_SIZE) -Commit=$(SIM_COMMIT) -timeout 24h -cpuprofile cpu.out -memprofile mem.out
 
-
 .PHONY: runsim sim-gaia-nondeterminism sim-gaia-custom-genesis-fast sim-gaia-fast sim-gaia-import-export \
 	sim-gaia-simulation-after-import sim-gaia-custom-genesis-multi-seed sim-gaia-multi-seed \
 	sim-benchmark-invariants sim-gaia-benchmark sim-gaia-profile