package home import ( "os" "runtime/debug" "time" "github.com/AdguardTeam/golibs/log" ) // memoryUsage implements a couple of not really beautiful hacks which purpose is to // make OS reclaim the memory freed by AdGuard Home as soon as possible. // See this for the details on the performance hits & gains: // https://github.com/AdguardTeam/AdGuardHome/internal/issues/2044#issuecomment-687042211 func memoryUsage(args options) { if args.disableMemoryOptimization { log.Info("Memory optimization is disabled") return } // Makes Go allocate heap at a slower pace // By default we keep it at 50% debug.SetGCPercent(50) // madvdontneed: setting madvdontneed=1 will use MADV_DONTNEED // instead of MADV_FREE on Linux when returning memory to the // kernel. This is less efficient, but causes RSS numbers to drop // more quickly. _ = os.Setenv("GODEBUG", "madvdontneed=1") // periodically call "debug.FreeOSMemory" so // that the OS could reclaim the free memory go func() { ticker := time.NewTicker(5 * time.Minute) for range ticker.C { log.Debug("free os memory") debug.FreeOSMemory() } }() }