func TestGoroutineParallelism(t *testing.T) {
P := 4
N := 10
if testing.Short() {
P = 3
N = 3
}
defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(P))
// If runtime triggers a forced GC during this test then it will deadlock,
// since the goroutines can't be stopped/preempted.
// Disable GC for this test (see issue #10958).
defer debug.SetGCPercent(debug.SetGCPercent(-1))
for try := 0; try < N; try++ {
done := make(chan bool)
x := uint32(0)
for p := 0; p < P; p++ {
// Test that all P goroutines are scheduled at the same time
go func(p int) {
for i := 0; i < 3; i++ {
expected := uint32(P*i + p)
for atomic.LoadUint32(&x) != expected {
}
atomic.StoreUint32(&x, expected+1)
}
done <- true
}(p)
}
for p := 0; p < P; p++ {
<-done
}
}
}
func main() {
// 禁用GC，并保证在main函数执行结束前恢复GC
defer debug.SetGCPercent(debug.SetGCPercent(-1))
var count int32
newFunc := func() interface{} {
return atomic.AddInt32(&count, 1)
}
pool := sync.Pool{New: newFunc}
// New 字段值的作用
v1 := pool.Get()
fmt.Printf("v1: %v\n", v1)
// 临时对象池的存取
pool.Put(newFunc())
pool.Put(newFunc())
pool.Put(newFunc())
v2 := pool.Get()
fmt.Printf("v2: %v\n", v2)
// 垃圾回收对临时对象池的影响
debug.SetGCPercent(100)
runtime.GC()
v3 := pool.Get()
fmt.Printf("v3: %v\n", v3)
pool.New = nil
v4 := pool.Get()
fmt.Printf("v4: %v\n", v4)
}
func (t *MSTree) LoadTxt(filename string, limit int) error {
f, err := os.Open(filename)
if err != nil {
return err
}
defer f.Close()
// Turn GC off
prevGC := debug.SetGCPercent(-1)
// Defer to turn GC back on
defer debug.SetGCPercent(prevGC)
scanner := bufio.NewScanner(f)
count := 0
for scanner.Scan() {
line := strings.TrimRight(scanner.Text(), "\n")
t.AddNoSync(line)
count++
if count%1000000 == 0 {
log.Info("Reindexed %d items", count)
}
if limit != -1 && count == limit {
break
}
}
log.Info("Reindexed %d items", count)
err = t.DumpIndex()
if err != nil {
return err
}
return nil
}
func mine(numProcs int) {
runtime.GOMAXPROCS(numProcs)
updateWork()
updateLastBlock()
debug.SetGCPercent(-1)
log.Println("using", numProcs, "processes")
switch {
case cpuid.AVX2:
log.Println("using AVX2 optimisations")
case cpuid.AVX:
log.Println("using AVX optimisations")
case cpuid.SSSE3:
log.Println("using SSSE3 optimisations")
case cpuid.ArmSha:
log.Println("using ARMSHA optimisations")
default:
log.Println("your CPU isn't supported for optimised mining")
log.Println("please use v1.1 or get a new CPU.")
os.Exit(1)
}
for proc := 0; proc < numProcs; proc++ {
// decide on miner and execute
switch {
case cpuid.AVX2:
go mineAVX2()
case cpuid.AVX:
go mineAVX()
case cpuid.SSSE3:
go mineSSSE3()
case cpuid.ArmSha:
go mineARM()
}
}
log.Println("mining for address " + address + "...")
previousTime := time.Now()
for {
for i := 0; i < 10; i++ {
time.Sleep(time.Second * 5)
log.Printf("%.2f MH/s\n", float64(hashesThisPeriod)/
time.Now().Sub(previousTime).Seconds())
previousTime = time.Now()
hashesThisPeriod = 0
updateWork()
updateLastBlock()
}
debug.SetGCPercent(10)
debug.SetGCPercent(-1)
}
}
func monitor() {
c := time.Tick(1 * time.Second)
mem := new(runtime.MemStats)
origPct := debug.SetGCPercent(100)
debug.SetGCPercent(origPct)
for _ = range c {
runtime.ReadMemStats(mem)
mu.Lock()
defer mu.Unlock()
if tSize < 0 {
continue
}
// Occupancy fraction: 70%. Don't GC before hitting this.
softLimit := float64(tSize) * 0.7
pct := softLimit / float64(mem.Alloc) * 100
fmt.Printf("gctune: pct: %0.5f, target: %d, softLimit: %0.2f, Alloc: %d, Sys: %d\n", pct, tSize, softLimit, mem.Alloc, mem.Sys)
if pct < 50 {
// If this is too low, GC frequency increases too much.
pct = 50
}
debug.SetGCPercent(int(pct))
if mem.Sys > uint64(tSize*70/100) {
fmt.Println("freeing")
debug.FreeOSMemory()
}
}
}
func TestPool(t *testing.T) {
// disable GC so we can control when it happens.
defer debug.SetGCPercent(debug.SetGCPercent(-1))
var p Pool
if p.Get() != nil {
t.Fatal("expected empty")
}
p.Put("a")
p.Put("b")
if g := p.Get(); g != "b" {
t.Fatalf("got %#v; want b", g)
}
if g := p.Get(); g != "a" {
t.Fatalf("got %#v; want a", g)
}
if g := p.Get(); g != nil {
t.Fatalf("got %#v; want nil", g)
}
p.Put("c")
debug.SetGCPercent(100) // to allow following GC to actually run
runtime.GC()
if g := p.Get(); g != nil {
t.Fatalf("got %#v; want nil after GC", g)
}
}
func TestPoolNew(t *testing.T) {
// disable GC so we can control when it happens.
defer debug.SetGCPercent(debug.SetGCPercent(-1))
i := 0
p := Pool{
New: func() interface{} {
i++
return i
},
}
if v := p.Get(); v != 1 {
t.Fatalf("got %v; want 1", v)
}
if v := p.Get(); v != 2 {
t.Fatalf("got %v; want 2", v)
}
p.Put(42)
if v := p.Get(); v != 42 {
t.Fatalf("got %v; want 42", v)
}
if v := p.Get(); v != 3 {
t.Fatalf("got %v; want 3", v)
}
}
func (s *Server) applyGcPercent(c *core.Config) (err error) {
if c.Go.GcPercent == 0 {
debug.SetGCPercent(100)
return
}
pv := debug.SetGCPercent(c.Go.GcPercent)
core.Trace.Println("set gc percent from", pv, "to", c.Go.GcPercent)
return
}
func garbageCollection() {
log.Printf("Starting garbageCollection()\n")
h.broadcastSys <- []byte("{\"gc\":\"starting\"}")
memoryStats()
debug.SetGCPercent(100)
debug.FreeOSMemory()
debug.SetGCPercent(-1)
log.Printf("Done with garbageCollection()\n")
h.broadcastSys <- []byte("{\"gc\":\"done\"}")
memoryStats()
}
func TestGcHashmapIndirection(t *testing.T) {
defer debug.SetGCPercent(debug.SetGCPercent(1))
runtime.GC()
type T struct {
a [256]int
}
m := make(map[T]T)
for i := 0; i < 2000; i++ {
var a T
a.a[0] = i
m[a] = T{}
}
}
func TestPoolsPutGet(t *testing.T) {
// disable GC so we can control when it happens.
defer debug.SetGCPercent(debug.SetGCPercent(-1))
N := 10000 * 100
var p = Pools{PrivateSize: N}
for i := 0; i < N; i++ {
p.Put(i)
}
for i := N - 1; i > 0; i-- {
if n := p.Get(); n != i {
t.Fatalf("got %v; want %d", n, i)
}
}
}
func GCFairness2() {
// Make sure user code can't exploit the GC's high priority
// scheduling to make scheduling of user code unfair. See
// issue #15706.
runtime.GOMAXPROCS(1)
debug.SetGCPercent(1)
var count [3]int64
var sink [3]interface{}
for i := range count {
go func(i int) {
for {
sink[i] = make([]byte, 1024)
atomic.AddInt64(&count[i], 1)
}
}(i)
}
// Note: If the unfairness is really bad, it may not even get
// past the sleep.
//
// If the scheduling rules change, this may not be enough time
// to let all goroutines run, but for now we cycle through
// them rapidly.
time.Sleep(30 * time.Millisecond)
for i := range count {
if atomic.LoadInt64(&count[i]) == 0 {
fmt.Printf("goroutine %d did not run\n", i)
return
}
}
fmt.Println("OK")
}
func proxyServer() {
loadConfigOrDie()
debug.SetGCPercent(config.GCPercent)
db, err := kvl.Open(config.Proxy.Database.Type, config.Proxy.Database.DSN)
if err != nil {
log.Fatalf("Couldn't connect to %v database: %v",
config.Proxy.Database.Type, err)
}
defer db.Close()
var h http.Handler
h, err = proxyserver.New(db, config.Proxy.Scrubbers, config.Proxy.CacheSize)
if err != nil {
log.Fatalf("Couldn't initialize handler: %v", err)
}
h = httputil.NewLimitParallelism(config.Proxy.ParallelRequests, h)
h = httputil.AddDebugHandlers(h, config.Proxy.Debug)
if !config.Proxy.DisableHTTPLogging {
h = httputil.LogHTTPRequests(h)
}
if config.Proxy.Listen == "none" {
for {
time.Sleep(time.Hour)
}
} else {
serveOrDie(config.Proxy.Listen, h)
}
}
func main() {
// Use all processor cores.
runtime.GOMAXPROCS(runtime.NumCPU())
// Block and transaction processing can cause bursty allocations. This
// limits the garbage collector from excessively overallocating during
// bursts. This value was arrived at with the help of profiling live
// usage.
debug.SetGCPercent(10)
// Up some limits.
if err := limits.SetLimits(); err != nil {
fmt.Fprintf(os.Stderr, "failed to set limits: %v\n", err)
os.Exit(1)
}
// Call serviceMain on Windows to handle running as a service. When
// the return isService flag is true, exit now since we ran as a
// service. Otherwise, just fall through to normal operation.
if runtime.GOOS == "windows" {
isService, err := winServiceMain()
if err != nil {
fmt.Println(err)
os.Exit(1)
}
if isService {
os.Exit(0)
}
}
// Work around defer not working after os.Exit()
if err := btcdMain(nil); err != nil {
os.Exit(1)
}
}
func handleMem(g *Req) error {
if g.R.Method == "POST" {
type memParams struct {
GCNow int `schema:"gc_now"`
GCPercent int `schema:"gc_percent"`
}
params := memParams{}
err := g.Decoder.Decode(¶ms, g.R.Form)
if err != nil {
g.Error("Failed to decode params: " + err.Error())
return ServerError("Failed to decode params: " + err.Error())
}
msg := "Adjusting mem system\n"
if params.GCNow > 0 {
info := "Running GC by request to handler"
g.Info(info)
msg += info + "\n"
runtime.GC()
}
if params.GCPercent > 0 {
oldVal := debug.SetGCPercent(params.GCPercent)
info := fmt.Sprintf("Set GC%% to [%d] was [%d]", params.GCPercent, oldVal)
g.Info(info)
msg += info + "\n"
}
return g.SendText([]byte(msg))
}
var memStats runtime.MemStats
runtime.ReadMemStats(&memStats)
return g.SendJson("memstats", memStats)
}
func serverSettingsHandler(c web.C, w http.ResponseWriter, r *http.Request) {
config := dvid.NewConfig()
if err := config.SetByJSON(r.Body); err != nil {
BadRequest(w, r, fmt.Sprintf("Error decoding POSTed JSON config for 'new': %v", err))
return
}
w.Header().Set("Content-Type", "text/plain")
// Handle GC percentage setting
percent, found, err := config.GetInt("gc")
if err != nil {
BadRequest(w, r, "POST on settings endpoint had bad parsing of 'gc' key: %v", err)
return
}
if found {
old := debug.SetGCPercent(percent)
fmt.Fprintf(w, "DVID server garbage collection target percentage set to %d from %d\n", percent, old)
}
// Handle max throttle ops setting
maxOps, found, err := config.GetInt("throttle")
if err != nil {
BadRequest(w, r, "POST on settings endpoint had bad parsing of 'throttle' key: %v", err)
return
}
if found {
old := maxThrottledOps
SetMaxThrottleOps(maxOps)
fmt.Fprintf(w, "Maximum throttled ops set to %d from %d\n", maxOps, old)
}
}
func Reset() {
UploadLimit = CFG.Net.MaxUpKBps << 10
DownloadLimit = CFG.Net.MaxDownKBps << 10
debug.SetGCPercent(CFG.Memory.GCPercTrshold)
MaxExpireTime = time.Duration(CFG.TXPool.TxExpireMaxHours) * time.Hour
ExpirePerKB = time.Duration(CFG.TXPool.TxExpireMinPerKB) * time.Minute
chain.MaxCachedBlocks = CFG.Memory.MaxCachedBlocks
if CFG.Net.TCPPort != 0 {
DefaultTcpPort = uint16(CFG.Net.TCPPort)
} else {
if CFG.Testnet {
DefaultTcpPort = 18333
} else {
DefaultTcpPort = 8333
}
}
ips := strings.Split(CFG.WebUI.AllowedIP, ",")
WebUIAllowed = nil
for i := range ips {
oaa := str2oaa(ips[i])
if oaa != nil {
WebUIAllowed = append(WebUIAllowed, *oaa)
} else {
println("ERROR: Incorrect AllowedIP:", ips[i])
}
}
if len(WebUIAllowed) == 0 {
println("WARNING: No IP is currently allowed at WebUI")
}
SetListenTCP(CFG.Net.ListenTCP, false)
ReloadMiners()
}
func show_mem(p string) {
al, sy := sys.MemUsed()
fmt.Println("Allocated:", al>>20, "MB")
fmt.Println("SystemMem:", sy>>20, "MB")
if p == "" {
return
}
if p == "free" {
fmt.Println("Freeing the mem...")
sys.FreeMem()
show_mem("")
return
}
if p == "gc" {
fmt.Println("Running GC...")
runtime.GC()
fmt.Println("Done.")
return
}
i, e := strconv.ParseInt(p, 10, 64)
if e != nil {
println(e.Error())
return
}
debug.SetGCPercent(int(i))
fmt.Println("GC treshold set to", i, "percent")
}
func TestSchedLocalQueueEmpty(t *testing.T) {
if runtime.NumCPU() == 1 {
// Takes too long and does not trigger the race.
t.Skip("skipping on uniprocessor")
}
defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(4))
// If runtime triggers a forced GC during this test then it will deadlock,
// since the goroutines can't be stopped/preempted during spin wait.
defer debug.SetGCPercent(debug.SetGCPercent(-1))
iters := int(1e5)
if testing.Short() {
iters = 1e2
}
runtime.RunSchedLocalQueueEmptyTest(iters)
}
func setup_runtime_vars() {
runtime.GOMAXPROCS(runtime.NumCPU()) // It seems that Go does not do it by default
if GCPerc > 0 {
debug.SetGCPercent(GCPerc)
}
qdb.SetDefragPercent(300)
//qdb.SetMaxPending(1000, 10000)
}
func (t *MSTree) LoadIndex() error {
var globalErr error = nil
files, err := ioutil.ReadDir(t.indexDir)
if err != nil {
log.Error("Error loading index: " + err.Error())
return err
}
if len(files) > 0 {
// Turn GC off
prevGC := debug.SetGCPercent(-1)
// Defer to turn GC back on
defer debug.SetGCPercent(prevGC)
ev := make(eventChan, len(files))
procCount := 0
for _, idxFile := range files {
fName := idxFile.Name()
if !strings.HasSuffix(fName, ".idx") {
continue
}
pref := fName[:len(fName)-4]
fName = fmt.Sprintf("%s/%s", t.indexDir, fName)
idxNode := newNode()
t.Root.Children[pref] = idxNode
go loadWorker(fName, idxNode, ev, &t.TotalMetrics)
procCount++
}
tm := time.Now()
for e := range ev {
procCount--
if e != nil {
globalErr = e
}
if procCount == 0 {
break
}
}
log.Notice("Index load complete in %s", time.Now().Sub(tm).String())
} else {
log.Debug("Index is empty. Hope that's ok")
}
return globalErr
}
// BEGIN OMIT
func TestSlice(t *testing.T) {
debug.SetGCPercent(-1)
slice := make([]string, 1e6)
start := time.Now()
for i := 0; i < 10e6; i++ {
slice = append(slice, "1234567890abcdef")
}
log.Println("TOTAL time string: ", time.Since(start)/1e6)
}
func main() {
runtime.GOMAXPROCS(runtime.NumCPU() - 1)
server := NewServer(256 * 1024 * 1024)
debug.SetGCPercent(10)
go func() {
log.Println(http.ListenAndServe("localhost:6060", nil))
}()
server.Start(":7788")
}
func init() {
gateway.ParseFlags()
if !gateway.Options.RunSwaggerServer {
gateway.ValidateFlags()
}
gateway.EnsureServerUlimit()
debug.SetGCPercent(800) // same env GOGC. in golang1.7, we needn't concern about this
}
func Initialize() {
// Disable the GC for debugging.
//debug.SetGCPercent(-1)
debug.SetGCPercent(1)
// Periodically force a GC flush
//go periodicFree(1 * time.Minute)
}
func setup_runtime_vars() {
runtime.GOMAXPROCS(runtime.NumCPU()) // It seems that Go does not do it by default
chain.MinBrowsableOutValue = 0
if GCPerc > 0 {
debug.SetGCPercent(GCPerc)
}
//qdb.SetDefragPercent(100)
//qdb.SetMaxPending(1000, 10000)
}
func benchmarkPoolsOverflows(b *testing.B, n int) {
defer debug.SetGCPercent(debug.SetGCPercent(-1))
switch n {
case 0, 1:
b.N = 10000000
case 2:
b.N = 1000000
case 4:
b.N = 1000000
case 8:
b.N = 1000000
case 16:
b.N = 100000
case 32:
b.N = 100000
case 64:
b.N = 100000
case 128:
b.N = 10000
case 256:
b.N = 10000
case 512:
b.N = 10000
case 1024:
b.N = 10000
}
b.StartTimer()
var p Pools
var v = 1
b.RunParallel(func(pb *testing.PB) {
for pb.Next() {
for i := 0; i < n; i++ {
p.Put(&v)
}
for i := 0; i < n; i++ {
p.Get()
}
}
})
b.StopTimer()
if n > 0 {
b.N *= n
}
}
func TestStrings(t *testing.T) {
printed := false
f := func() {
var dst []Win32_Process
zeros := 0
q := CreateQuery(&dst, "")
for i := 0; i < 5; i++ {
err := Query(q, &dst)
if err != nil {
t.Fatal(err, q)
}
for _, d := range dst {
v := reflect.ValueOf(d)
for j := 0; j < v.NumField(); j++ {
f := v.Field(j)
if f.Kind() != reflect.String {
continue
}
s := f.Interface().(string)
if len(s) > 0 && s[0] == '\u0000' {
zeros++
if !printed {
printed = true
j, _ := json.MarshalIndent(&d, "", " ")
t.Log("Example with \\u0000:\n", string(j))
}
}
}
}
fmt.Println("iter", i, "zeros:", zeros)
}
if zeros > 0 {
t.Error("> 0 zeros")
}
}
fmt.Println("Disabling GC")
debug.SetGCPercent(-1)
f()
fmt.Println("Enabling GC")
debug.SetGCPercent(100)
f()
}
func main() {
debug.SetGCPercent(10)
fmt.Println("Number of entries: ", entries)
config := bigcache.Config{
Shards: 256,
LifeWindow: 100 * time.Minute,
MaxEntriesInWindow: entries,
MaxEntrySize: 200,
Verbose: true,
}
bigcache, _ := bigcache.NewBigCache(config)
for i := 0; i < entries; i++ {
key, val := generateKeyValue(i, valueSize)
bigcache.Set(key, val)
}
firstKey, _ := generateKeyValue(1, valueSize)
checkFirstElement(bigcache.Get(firstKey))
fmt.Println("GC pause for bigcache: ", gcPause())
bigcache = nil
gcPause()
//------------------------------------------
freeCache := freecache.NewCache(entries * 200) //allocate entries * 200 bytes
for i := 0; i < entries; i++ {
key, val := generateKeyValue(i, valueSize)
if err := freeCache.Set([]byte(key), val, 0); err != nil {
fmt.Println("Error in set: ", err.Error())
}
}
firstKey, _ = generateKeyValue(1, valueSize)
checkFirstElement(freeCache.Get([]byte(firstKey)))
if freeCache.OverwriteCount() != 0 {
fmt.Println("Overwritten: ", freeCache.OverwriteCount())
}
fmt.Println("GC pause for freecache: ", gcPause())
freeCache = nil
gcPause()
//------------------------------------------
mapCache := make(map[string][]byte)
for i := 0; i < entries; i++ {
key, val := generateKeyValue(i, valueSize)
mapCache[key] = val
}
fmt.Println("GC pause for map: ", gcPause())
}
func main() {
flag.Parse()
if *flagMaster != "" && *flagSlave != "" {
log.Fatalf("both -master and -slave are specified")
}
if *flagPprof != "" {
go http.ListenAndServe(*flagPprof, nil)
} else {
runtime.MemProfileRate = 0
}
go func() {
c := make(chan os.Signal, 1)
signal.Notify(c, syscall.SIGINT)
<-c
atomic.StoreUint32(&shutdown, 1)
close(shutdownC)
log.Printf("shutting down...")
time.Sleep(2 * time.Second)
for _, f := range shutdownCleanup {
f()
}
os.Exit(0)
}()
runtime.GOMAXPROCS(min(*flagProcs, runtime.NumCPU()))
debug.SetGCPercent(50) // most memory is in large binary blobs
lowerProcessPrio()
if *flagMaster != "" || *flagSlave == "" {
if *flagWorkdir == "" {
log.Fatalf("-workdir is not set")
}
if *flagMaster == "" {
*flagMaster = "localhost:0"
}
ln, err := net.Listen("tcp", *flagMaster)
if err != nil {
log.Fatalf("failed to listen: %v", err)
}
if *flagMaster == "localhost:0" && *flagSlave == "" {
*flagSlave = ln.Addr().String()
}
go masterMain(ln)
}
if *flagSlave != "" {
if *flagBin == "" {
log.Fatalf("-bin is not set")
}
go slaveMain()
}
select {}
}
