func startProfiler(filename *string) error {
if filename == nil || *filename == "" {
return nil
}
cpuProfileFile, err := os.Create(*filename)
if err != nil {
return err
}
runtime.SetCPUProfileRate(500)
stopped := make(chan bool)
go waitForSignals(stopped)
go func() {
for {
select {
default:
data := runtime.CPUProfile()
if data == nil {
cpuProfileFile.Close()
stopped <- true
break
}
cpuProfileFile.Write(data)
}
}
}()
return nil
}
func profileWriter(w io.Writer) {
startTime := time.Now()
// This will buffer the entire profile into buf and then
// translate it into a profile.Profile structure. This will
// create two copies of all the data in the profile in memory.
// TODO(matloob): Convert each chunk of the proto output and
// stream it out instead of converting the entire profile.
var buf bytes.Buffer
for {
data := runtime.CPUProfile()
if data == nil {
break
}
buf.Write(data)
}
profile, err := protopprof.TranslateCPUProfile(buf.Bytes(), startTime)
if err != nil {
// The runtime should never produce an invalid or truncated profile.
// It drops records that can't fit into its log buffers.
panic(fmt.Errorf("could not translate binary profile to proto format: %v", err))
}
profile.Write(w)
cpu.done <- true
}
func startProfiler() error {
if profileFilename == nil || *profileFilename == "" {
return nil
}
startCHeapProfiler(*profileFilename)
runtime.MemProfileRate = 1024
cpuProfileFile, err := os.Create(fmt.Sprintf("%s.cpu", *profileFilename))
if err != nil {
return err
}
runtime.SetCPUProfileRate(500)
stopped := make(chan bool)
go waitForSignals(*profileFilename, stopped)
go func() {
for {
select {
default:
data := runtime.CPUProfile()
if data == nil {
cpuProfileFile.Close()
stopped <- true
break
}
cpuProfileFile.Write(data)
}
}
}()
return nil
}
func profileWriter(w io.Writer) {
for {
data := runtime.CPUProfile()
if data == nil {
break
}
w.Write(data)
}
cpu.done <- true
}
func profileWriter(w io.Writer) {
for {
data := runtime.CPUProfile()
if data == nil {
break
}
errors.Logf("DEBUG", "profileWriter got data %v", len(data))
w.Write(data)
}
profileDone <- true
}
func main() {
select {
case <-time.After(time.Second):
fmt.Println(time.Minute.Seconds(), time.Second)
}
select {
case <-time.After(time.Minute):
fmt.Println(time.Minute.Seconds(), time.Second)
}
var kvlist []int
kvlist = make([]int, 0, 10)
kvlist = append(kvlist, 1)
fmt.Println(kvlist)
m := make(map[int]int, 10)
m[1] += 1
fmt.Println("aaaa:", string(runtime.CPUProfile()), m, cap(kvlist))
for i := 0; ; i++ {
pc, file, line, ok := runtime.Caller(i)
if ok == false {
break
}
fmt.Println(pc, file, line, ok)
//runtime.Breakpoint()
}
fmt.Println(runtime.Version())
buf := make([]byte, 1025)
len := runtime.Stack(buf, true)
fmt.Println(string(runtime.CPUProfile()))
fmt.Println(len, string(buf[:len]))
//debug.PrintStack()
fmt.Println(debug.SetMaxThreads(10))
i := 100
fmt.Println(reflect.TypeOf((*int32)(nil)).Elem())
fmt.Println(reflect.ValueOf(&i).Kind())
fmt.Println(reflect.TypeOf(&i).Kind())
RoundPos(3, func(r, x, y int32) {
println(r, x, y)
})
}
func profileWriter(w io.Writer) {
for {
data := runtime.CPUProfile()
if data == nil {
break
}
w.Write(data)
}
// We are emitting the legacy profiling format, which permits
// a memory map following the CPU samples. The memory map is
// simply a copy of the GNU/Linux /proc/self/maps file. The
// profiler uses the memory map to map PC values in shared
// libraries to a shared library in the filesystem, in order
// to report the correct function and, if the shared library
// has debug info, file/line. This is particularly useful for
// PIE (position independent executables) as on ELF systems a
// PIE is simply an executable shared library.
//
// Because the profiling format expects the memory map in
// GNU/Linux format, we only do this on GNU/Linux for now. To
// add support for profiling PIE on other ELF-based systems,
// it may be necessary to map the system-specific mapping
// information to the GNU/Linux format. For a reasonably
// portable C++ version, see the FillProcSelfMaps function in
// https://github.com/gperftools/gperftools/blob/master/src/base/sysinfo.cc
//
// The code that parses this mapping for the pprof tool is
// ParseMemoryMap in cmd/internal/pprof/legacy_profile.go, but
// don't change that code, as similar code exists in other
// (non-Go) pprof readers. Change this code so that that code works.
//
// We ignore errors reading or copying the memory map; the
// profile is likely usable without it, and we have no good way
// to report errors.
if runtime.GOOS == "linux" {
f, err := os.Open("/proc/self/maps")
if err == nil {
io.WriteString(w, "\nMAPPED_LIBRARIES:\n")
io.Copy(w, f)
f.Close()
}
}
cpu.done <- true
}
func profileWriter(w io.Writer) {
var buf bytes.Buffer
for {
data := runtime.CPUProfile()
buf.Write(data)
if data == nil {
break
}
}
p, err := protopprof.TranslateCPUProfile(buf.Bytes(), cpu.startTime)
if err != nil {
panic(err)
}
p.RemapAll()
protopprof.CleanupDuplicateLocations(p)
protopprof.Symbolize(p)
p.Write(w)
cpu.done <- true
}
func startProfiler(stoppable Stoppable) error {
if profileFilename == nil || *profileFilename == "" {
log.Info("Not starting profiling since the profile prefix is not set")
return nil
}
log.Info("Starting profiling with prefix %s", *profileFilename)
startCHeapProfiler(*profileFilename)
// startCCpuProfiler(*profileFilename)
runtime.MemProfileRate = 1024
cpuProfileFile, err := os.Create(fmt.Sprintf("%s.cpu", *profileFilename))
if err != nil {
return err
}
runtime.SetCPUProfileRate(500)
stopped := make(chan bool)
go waitForSignals(stoppable, *profileFilename, stopped)
go func() {
for {
select {
default:
data := runtime.CPUProfile()
if data == nil {
cpuProfileFile.Close()
stopped <- true
break
}
cpuProfileFile.Write(data)
}
}
}()
return nil
}