* call debug.FreeOSMemory() once in 5 minutes

home/config.go

@@ -47,6 +47,12 @@ type configuration struct {
 	RlimitNoFile uint   `yaml:"rlimit_nofile"` // Maximum number of opened fd's per process (0: default)
 	DebugPProf   bool   `yaml:"debug_pprof"`   // Enable pprof HTTP server on port 6060
 
+	// The value for SetGCPercent.
+	// SetGCPercent sets the garbage collection target percentage:
+	// a collection is triggered when the ratio of freshly allocated data
+	// to live data remaining after the previous collection reaches this percentage.
+	MemGCPercent uint8 `yaml:"mem_gc_percentage"`
+
 	// TTL for a web session (in hours)
 	// An active session is automatically refreshed once a day.
 	WebSessionTTLHours uint32 `yaml:"web_session_ttl"`

home/home.go

@@ -13,6 +13,7 @@ import (
 	"os/signal"
 	"path/filepath"
 	"runtime"
+	"runtime/debug"
 	"strconv"
 	"sync"
 	"syscall"
@@ -209,6 +210,11 @@ func run(args options) {
 			log.Info("Configuration file is OK")
 			os.Exit(0)
 		}
+
+		if config.MemGCPercent != 0 {
+			debug.SetGCPercent(int(config.MemGCPercent))
+			log.Debug("Set SetGCPercent=%d", config.MemGCPercent)
+		}
 	}
 
 	// 'clients' module uses 'dnsfilter' module's static data (dnsfilter.BlockedSvcKnown()),

main.go

@@ -40,7 +40,7 @@ func memoryUsage() {
 	// periodically call "debug.FreeOSMemory" so
 	// that the OS could reclaim the free memory
 	go func() {
-		ticker := time.NewTicker(15 * time.Second)
+		ticker := time.NewTicker(5 * time.Minute)
 		for {
 			select {
 			case t := <-ticker.C: