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 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
}