Jemalloc

cmd/juno/juno.go

@@ -13,6 +13,7 @@ import (
 	"syscall"
 	"time"
 
+	_ "github.com/NethermindEth/juno/jemalloc"
 	"github.com/NethermindEth/juno/node"
 	"github.com/NethermindEth/juno/utils"
 	"github.com/ethereum/go-ethereum/common"

jemalloc/jemalloc.go

@@ -0,0 +1,28 @@
+package jemalloc
+
+/*
+// This cgo directive is what actually causes jemalloc to be linked in to the
+// final Go executable
+#cgo pkg-config: jemalloc
+
+#include <jemalloc/jemalloc.h>
+
+void _refresh_jemalloc_stats() {
+	// You just need to pass something not-null into the "epoch" mallctl.
+	size_t random_something = 1;
+	mallctl("epoch", NULL, NULL, &random_something, sizeof(random_something));
+}
+int _get_jemalloc_active() {
+	size_t stat, stat_size;
+	stat = 0;
+	stat_size = sizeof(stat);
+	mallctl("stats.active", &stat, &stat_size, NULL, 0);
+	return (int)stat;
+}
+*/
+import "C"
+
+func GetActive() C.int {
+	C._refresh_jemalloc_stats()
+	return C._get_jemalloc_active()
+}

node/metrics.go

@@ -10,6 +10,7 @@ import (
 	"github.com/NethermindEth/juno/clients/gateway"
 	"github.com/NethermindEth/juno/core"
 	"github.com/NethermindEth/juno/db"
+	"github.com/NethermindEth/juno/jemalloc"
 	"github.com/NethermindEth/juno/jsonrpc"
 	"github.com/NethermindEth/juno/l1"
 	"github.com/NethermindEth/juno/sync"
@@ -261,3 +262,13 @@ func makeGatewayMetrics() gateway.EventListener {
 		},
 	}
 }
+
+func makeJeMallocMetrics() {
+	active := prometheus.NewGaugeFunc(prometheus.GaugeOpts{
+		Namespace: "jemalloc",
+		Name:      "active",
+	}, func() float64 {
+		return float64(jemalloc.GetActive())
+	})
+	prometheus.MustRegister(active)
+}

node/node.go

@@ -187,6 +187,7 @@ func New(cfg *Config, version string) (*Node, error) { //nolint:gocyclo,funlen
 		client.WithListener(makeFeederMetrics())
 		gatewayClient.WithListener(makeGatewayMetrics())
 		metricsService = makeMetrics(cfg.MetricsHost, cfg.MetricsPort)
+		makeJeMallocMetrics()
 	}
 	if cfg.GRPC {
 		services = append(services, makeGRPC(cfg.GRPCHost, cfg.GRPCPort, database, version))