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mo-service: track active connections #18788

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136 changes: 136 additions & 0 deletions cmd/mo-service/debug_connections.go
Original file line number Diff line number Diff line change
@@ -0,0 +1,136 @@
// Copyright 2021 Matrix Origin
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

//go:build linux

package main

import (
"cmp"
"context"
"maps"
"runtime"
"slices"
"time"

"github.com/matrixorigin/matrixone/pkg/logutil"
"github.com/ti-mo/conntrack"
"github.com/ti-mo/netfilter"
"go.uber.org/zap"
)

func init() {
startConnectionTracking()
}

const (
tooManyThreshold = 4096
)

var (
conntrackReportInterval = time.Second * 5
)

func startConnectionTracking() (err error) {
defer func() {
if err != nil {
logutil.Error("conntrack: error", zap.Error(err))
}
}()

c, err := conntrack.Dial(nil)
if err != nil {
return err
}

events := make(chan conntrack.Event, 65536)
errorChan, err := c.Listen(events, uint8(max(runtime.NumCPU(), 16)), []netfilter.NetlinkGroup{
netfilter.GroupCTNew,
netfilter.GroupCTDestroy,
})
if err != nil {
return err
}

go func() {
defer c.Close()
logConnTrack(context.Background(), events, errorChan)
}()

return nil
}

func logConnTrack(ctx context.Context, events chan conntrack.Event, errorChan chan error) {

activeConns := make(map[uint32]*conntrack.Flow)
ticker := time.NewTicker(conntrackReportInterval)

for {
select {

case <-ctx.Done():
return

case ev := <-events:
switch ev.Type {

case conntrack.EventNew:
activeConns[ev.Flow.ID] = ev.Flow

case conntrack.EventDestroy:
delete(activeConns, ev.Flow.ID)

}

case err := <-errorChan:
logutil.Error("conntrack: error", zap.Error(err))

case <-ticker.C:
logutil.Info("conntrack: stats",
zap.Any("connections", len(activeConns)),
)

if len(activeConns) > tooManyThreshold {
logConnectionStats(activeConns)
}

}
}
}

func logConnectionStats(actives map[uint32]*conntrack.Flow) {
srcPorts := make(map[uint16]int)
destPorts := make(map[uint16]int)
for _, flow := range actives {
srcPorts[flow.TupleOrig.Proto.SourcePort]++
destPorts[flow.TupleOrig.Proto.DestinationPort]++
}
logPortStats(srcPorts, "source port")
logPortStats(destPorts, "dest port")
}

func logPortStats(stats map[uint16]int, what string) {
srcKeys := slices.SortedFunc(maps.Keys(stats), func(a, b uint16) int {
return -cmp.Compare(stats[a], stats[b])
})
for _, port := range srcKeys {
if stats[port] < tooManyThreshold/10 {
break
}
logutil.Info("conntrack: port stats",
zap.Any(what, port),
zap.Any("connections", stats[port]),
)
}
}
88 changes: 88 additions & 0 deletions cmd/mo-service/debug_connections_test.go
Original file line number Diff line number Diff line change
@@ -0,0 +1,88 @@
// Copyright 2022 Matrix Origin
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package main

import (
"context"
"io"
"math/rand/v2"
"testing"
"time"

"github.com/ti-mo/conntrack"
)

func TestConntrack(t *testing.T) {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()

events := make(chan conntrack.Event)
errorCh := make(chan error)

go logConnTrack(ctx, events, errorCh)

t0 := time.Now()
for {

for range tooManyThreshold {

events <- conntrack.Event{
Type: conntrack.EventNew,
Flow: &conntrack.Flow{
ID: rand.Uint32(),
TupleOrig: conntrack.Tuple{
Proto: conntrack.ProtoTuple{
SourcePort: 42,
DestinationPort: 41,
},
},
},
}

events <- conntrack.Event{
Type: conntrack.EventDestroy,
Flow: &conntrack.Flow{
ID: rand.Uint32(),
TupleOrig: conntrack.Tuple{
Proto: conntrack.ProtoTuple{
SourcePort: 42,
DestinationPort: 41,
},
},
},
}

}

errorCh <- io.ErrShortBuffer
events <- conntrack.Event{
Type: conntrack.EventNew,
Flow: &conntrack.Flow{
ID: rand.Uint32(),
TupleOrig: conntrack.Tuple{
Proto: conntrack.ProtoTuple{
SourcePort: 1,
DestinationPort: 2,
},
},
},
}

time.Sleep(time.Second)
if time.Since(t0) > conntrackReportInterval+time.Second {
break
}
}
}
14 changes: 10 additions & 4 deletions go.mod
Original file line number Diff line number Diff line change
Expand Up @@ -68,13 +68,14 @@ require (
github.com/spf13/cobra v1.8.0
github.com/spkg/bom v1.0.0
github.com/stretchr/testify v1.9.0
github.com/ti-mo/conntrack v0.5.1
github.com/tidwall/btree v1.6.0
github.com/tidwall/pretty v1.2.1
go.uber.org/automaxprocs v1.5.3
go.uber.org/ratelimit v0.2.0
go.uber.org/zap v1.24.0
golang.org/x/exp v0.0.0-20231006140011-7918f672742d
golang.org/x/sync v0.6.0
golang.org/x/sync v0.7.0
golang.org/x/sys v0.21.0
gonum.org/v1/gonum v0.14.0
google.golang.org/grpc v1.62.1
Expand All @@ -92,11 +93,15 @@ require (
github.com/dustin/go-humanize v1.0.1 // indirect
github.com/gobwas/glob v0.2.3 // indirect
github.com/godbus/dbus/v5 v5.0.4 // indirect
github.com/google/go-cmp v0.6.0 // indirect
github.com/gosimple/slug v1.13.1 // indirect
github.com/gosimple/unidecode v1.0.1 // indirect
github.com/itchyny/timefmt-go v0.1.6 // indirect
github.com/jmespath/go-jmespath v0.4.0 // indirect
github.com/josharian/native v1.1.0 // indirect
github.com/mattn/go-runewidth v0.0.15 // indirect
github.com/mdlayher/netlink v1.7.2 // indirect
github.com/mdlayher/socket v0.5.1 // indirect
github.com/minio/md5-simd v1.1.2 // indirect
github.com/minio/sha256-simd v1.0.1 // indirect
github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
Expand All @@ -110,8 +115,9 @@ require (
github.com/segmentio/asm v1.1.3 // indirect
github.com/shoenig/go-m1cpu v0.1.6 // indirect
github.com/tetratelabs/wazero v1.7.3 // indirect
golang.org/x/crypto v0.21.0 // indirect
golang.org/x/text v0.14.0 // indirect
github.com/ti-mo/netfilter v0.5.2 // indirect
golang.org/x/crypto v0.23.0 // indirect
golang.org/x/text v0.15.0 // indirect
golang.org/x/time v0.3.0 // indirect
)

Expand Down Expand Up @@ -182,7 +188,7 @@ require (
go.uber.org/atomic v1.11.0 // indirect
go.uber.org/multierr v1.11.0 // indirect
golang.org/x/mod v0.16.0 // indirect
golang.org/x/net v0.22.0 // indirect
golang.org/x/net v0.25.0 // indirect
golang.org/x/tools v0.14.0 // indirect
google.golang.org/genproto/googleapis/rpc v0.0.0-20240318140521-94a12d6c2237 // indirect
gopkg.in/ini.v1 v1.67.0 // indirect
Expand Down
32 changes: 22 additions & 10 deletions go.sum
Original file line number Diff line number Diff line change
Expand Up @@ -418,6 +418,8 @@ github.com/jonboulle/clockwork v0.4.0 h1:p4Cf1aMWXnXAUh8lVfewRBx1zaTSYKrKMF2g3ST
github.com/jonboulle/clockwork v0.4.0/go.mod h1:xgRqUGwRcjKCO1vbZUEtSLrqKoPSsUpK7fnezOII0kc=
github.com/josharian/intern v1.0.0 h1:vlS4z54oSdjm0bgjRigI+G1HpF+tI+9rE5LLzOg8HmY=
github.com/josharian/intern v1.0.0/go.mod h1:5DoeVV0s6jJacbCEi61lwdGj/aVlrQvzHFFd8Hwg//Y=
github.com/josharian/native v1.1.0 h1:uuaP0hAbW7Y4l0ZRQ6C9zfb7Mg1mbFKry/xzDAfmtLA=
github.com/josharian/native v1.1.0/go.mod h1:7X/raswPFr05uY3HiLlYeyQntB6OO7E/d2Cu7qoaN2w=
github.com/json-iterator/go v1.1.5/go.mod h1:+SdeFBvtyEkXs7REEP0seUULqWtbJapLOCVDaaPEHmU=
github.com/json-iterator/go v1.1.6/go.mod h1:+SdeFBvtyEkXs7REEP0seUULqWtbJapLOCVDaaPEHmU=
github.com/json-iterator/go v1.1.9/go.mod h1:KdQUCv79m/52Kvf8AW2vK1V8akMuk1QjK/uOdHXbAo4=
Expand Down Expand Up @@ -507,6 +509,10 @@ github.com/mattn/go-shellwords v1.0.12/go.mod h1:EZzvwXDESEeg03EKmM+RmDnNOPKG4lL
github.com/mattn/goveralls v0.0.2/go.mod h1:8d1ZMHsd7fW6IRPKQh46F2WRpyib5/X4FOpevwGNQEw=
github.com/matttproud/golang_protobuf_extensions v1.0.4 h1:mmDVorXM7PCGKw94cs5zkfA9PSy5pEvNWRP0ET0TIVo=
github.com/matttproud/golang_protobuf_extensions v1.0.4/go.mod h1:BSXmuO+STAnVfrANrmjBb36TMTDstsz7MSK+HVaYKv4=
github.com/mdlayher/netlink v1.7.2 h1:/UtM3ofJap7Vl4QWCPDGXY8d3GIY2UGSDbK+QWmY8/g=
github.com/mdlayher/netlink v1.7.2/go.mod h1:xraEF7uJbxLhc5fpHL4cPe221LI2bdttWlU+ZGLfQSw=
github.com/mdlayher/socket v0.5.1 h1:VZaqt6RkGkt2OE9l3GcC6nZkqD3xKeQLyfleW/uBcos=
github.com/mdlayher/socket v0.5.1/go.mod h1:TjPLHI1UgwEv5J1B5q0zTZq12A/6H7nKmtTanQE37IQ=
github.com/mediocregopher/mediocre-go-lib v0.0.0-20181029021733-cb65787f37ed/go.mod h1:dSsfyI2zABAdhcbvkXqgxOxrCsbYeHCPgrZkku60dSg=
github.com/mediocregopher/radix/v3 v3.3.0/go.mod h1:EmfVyvspXz1uZEyPBMyGK+kjWiKQGvsUt6O3Pj+LDCQ=
github.com/mediocregopher/radix/v3 v3.4.2/go.mod h1:8FL3F6UQRXHXIBSPUs5h0RybMF8i4n7wVopoX3x7Bv8=
Expand Down Expand Up @@ -731,6 +737,10 @@ github.com/tetratelabs/wazero v1.7.3 h1:PBH5KVahrt3S2AHgEjKu4u+LlDbbk+nsGE3KLucy
github.com/tetratelabs/wazero v1.7.3/go.mod h1:ytl6Zuh20R/eROuyDaGPkp82O9C/DJfXAwJfQ3X6/7Y=
github.com/theupdateframework/notary v0.7.0 h1:QyagRZ7wlSpjT5N2qQAh/pN+DVqgekv4DzbAiAiEL3c=
github.com/theupdateframework/notary v0.7.0/go.mod h1:c9DRxcmhHmVLDay4/2fUYdISnHqbFDGRSlXPO0AhYWw=
github.com/ti-mo/conntrack v0.5.1 h1:opEwkFICnDbQc0BUXl73PHBK0h23jEIFVjXsqvF4GY0=
github.com/ti-mo/conntrack v0.5.1/go.mod h1:T6NCbkMdVU4qEIgwL0njA6lw/iCAbzchlnwm1Sa314o=
github.com/ti-mo/netfilter v0.5.2 h1:CTjOwFuNNeZ9QPdRXt1MZFLFUf84cKtiQutNauHWd40=
github.com/ti-mo/netfilter v0.5.2/go.mod h1:Btx3AtFiOVdHReTDmP9AE+hlkOcvIy403u7BXXbWZKo=
github.com/tidwall/btree v1.6.0 h1:LDZfKfQIBHGHWSwckhXI0RPSXzlo+KYdjK7FWSqOzzg=
github.com/tidwall/btree v1.6.0/go.mod h1:twD9XRA5jj9VUQGELzDO4HPQTNJsoWWfYEL+EUQ2cKY=
github.com/tidwall/pretty v1.2.1 h1:qjsOFOWWQl+N3RsoF5/ssm1pHmJJwhjlSbZ51I6wMl4=
Expand Down Expand Up @@ -767,6 +777,8 @@ github.com/valyala/fasttemplate v1.2.1/go.mod h1:KHLXt3tVN2HBp8eijSv/kGJopbvo7S+
github.com/valyala/histogram v1.2.0 h1:wyYGAZZt3CpwUiIb9AU/Zbllg1llXyrtApRS815OLoQ=
github.com/valyala/histogram v1.2.0/go.mod h1:Hb4kBwb4UxsaNbbbh+RRz8ZR6pdodR57tzWUS3BUzXY=
github.com/valyala/tcplisten v0.0.0-20161114210144-ceec8f93295a/go.mod h1:v3UYOV9WzVtRmSR+PDvWpU/qWl4Wa5LApYYX4ZtKbio=
github.com/vishvananda/netns v0.0.4 h1:Oeaw1EM2JMxD51g9uhtC0D7erkIjgmj8+JZc26m1YX8=
github.com/vishvananda/netns v0.0.4/go.mod h1:SpkAiCQRtJ6TvvxPnOSyH3BMl6unz3xZlaprSwhNNJM=
github.com/xeipuuv/gojsonpointer v0.0.0-20180127040702-4e3ac2762d5f/go.mod h1:N2zxlSyiKSe5eX1tZViRH5QA0qijqEDrYZiPEAiq3wU=
github.com/xeipuuv/gojsonpointer v0.0.0-20190905194746-02993c407bfb h1:zGWFAtiMcyryUHoUjUJX0/lt1H2+i2Ka2n+D3DImSNo=
github.com/xeipuuv/gojsonpointer v0.0.0-20190905194746-02993c407bfb/go.mod h1:N2zxlSyiKSe5eX1tZViRH5QA0qijqEDrYZiPEAiq3wU=
Expand Down Expand Up @@ -853,8 +865,8 @@ golang.org/x/crypto v0.0.0-20191227163750-53104e6ec876/go.mod h1:LzIPMQfyMNhhGPh
golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
golang.org/x/crypto v0.0.0-20210322153248-0c34fe9e7dc2/go.mod h1:T9bdIzuCu7OtxOm1hfPfRQxPLYneinmdGuTeoZ9dtd4=
golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
golang.org/x/crypto v0.21.0 h1:X31++rzVUdKhX5sWmSOFZxx8UW/ldWx55cbf08iNAMA=
golang.org/x/crypto v0.21.0/go.mod h1:0BP7YvVV9gBbVKyeTG0Gyn+gZm94bibOW5BjDEYAOMs=
golang.org/x/crypto v0.23.0 h1:dIJU/v2J8Mdglj/8rJ6UUOM3Zc9zLZxVZwwxMooUSAI=
golang.org/x/crypto v0.23.0/go.mod h1:CKFgDieR+mRhux2Lsu27y0fO304Db0wZe70UKqHu0v8=
golang.org/x/exp v0.0.0-20180321215751-8460e604b9de/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
golang.org/x/exp v0.0.0-20180807140117-3d87b88a115f/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
Expand Down Expand Up @@ -905,8 +917,8 @@ golang.org/x/net v0.0.0-20211008194852-3b03d305991f/go.mod h1:9nx3DQGgdP8bBQD5qx
golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
golang.org/x/net v0.1.0/go.mod h1:Cx3nUiGt4eDBEyega/BKRp+/AlGL8hYe7U9odMt2Cco=
golang.org/x/net v0.7.0/go.mod h1:2Tu9+aMcznHK/AK1HMvgo6xiTLG5rD5rZLDS+rp2Bjs=
golang.org/x/net v0.22.0 h1:9sGLhx7iRIHEiX0oAJ3MRZMUCElJgy7Br1nO+AMN3Tc=
golang.org/x/net v0.22.0/go.mod h1:JKghWKKOSdJwpW2GEx0Ja7fmaKnMsbu+MWVZTokSYmg=
golang.org/x/net v0.25.0 h1:d/OCCoBEUq33pjydKrGQhw7IlUPI2Oylr+8qLx49kac=
golang.org/x/net v0.25.0/go.mod h1:JkAGAh7GEvH74S6FOH42FLoXpXbE/aqXSrIQjXgsiwM=
golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
golang.org/x/oauth2 v0.16.0 h1:aDkGMBSYxElaoP81NpoUoz2oo2R2wHdZpGToUxfyQrQ=
golang.org/x/oauth2 v0.16.0/go.mod h1:hqZ+0LWXsiVoZpeld6jVt06P3adbS2Uu911W1SsJv2o=
Expand All @@ -920,8 +932,8 @@ golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9/go.mod h1:RxMgew5VJxzue5/jJ
golang.org/x/sync v0.0.0-20210220032951-036812b2e83c/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.6.0 h1:5BMeUDZ7vkXGfEr1x9B4bRcTH4lpkTkpdh0T/J+qjbQ=
golang.org/x/sync v0.6.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
golang.org/x/sync v0.7.0 h1:YsImfSBoP9QPYL0xyKJPq0gcaJdG3rInoqxTWbfQu9M=
golang.org/x/sync v0.7.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
golang.org/x/sys v0.0.0-20180807162357-acbc56fc7007/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20180810173357-98c5dad5d1a0/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
Expand Down Expand Up @@ -973,8 +985,8 @@ golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9sn
golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
golang.org/x/term v0.1.0/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
golang.org/x/term v0.5.0/go.mod h1:jMB1sMXY+tzblOD4FWmEbocvup2/aLOaQEp7JmGp78k=
golang.org/x/term v0.18.0 h1:FcHjZXDMxI8mM3nwhX9HlKop4C0YQvCVCdwYl2wOtE8=
golang.org/x/term v0.18.0/go.mod h1:ILwASektA3OnRv7amZ1xhE/KTR+u50pbXfZ03+6Nx58=
golang.org/x/term v0.20.0 h1:VnkxpohqXaOBYJtBmEppKUG6mXpi+4O6purfc2+sMhw=
golang.org/x/term v0.20.0/go.mod h1:8UkIAJTvZgivsXaD6/pH6U9ecQzZ45awqEOzuCvwpFY=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
Expand All @@ -983,8 +995,8 @@ golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
golang.org/x/text v0.4.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
golang.org/x/text v0.7.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
golang.org/x/text v0.14.0 h1:ScX5w1eTa3QqT8oi6+ziP7dTV1S2+ALU0bI+0zXKWiQ=
golang.org/x/text v0.14.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
golang.org/x/text v0.15.0 h1:h1V/4gjBv8v9cjcR6+AR5+/cIYK5N/WAgiv4xlsEtAk=
golang.org/x/text v0.15.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
golang.org/x/time v0.0.0-20201208040808-7e3f01d25324/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
golang.org/x/time v0.3.0 h1:rg5rLMjNzMS1RkNLzCG38eapWhnYLFYXDXj2gOlr8j4=
golang.org/x/time v0.3.0/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
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