/
profile.go
51 lines (46 loc) · 1.04 KB
/
profile.go
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package run
import (
"log"
"os"
"runtime"
"runtime/pprof"
)
// prof stores the file locations of active profiles.
var prof struct {
cpu *os.File
mem *os.File
}
// StartProfile initializes the cpu and memory profile, if specified.
func startProfile(cpuprofile, memprofile string) {
if cpuprofile != "" {
f, err := os.Create(cpuprofile)
if err != nil {
log.Fatalf("cpuprofile: %v", err)
}
log.Printf("writing CPU profile to: %s\n", cpuprofile)
prof.cpu = f
pprof.StartCPUProfile(prof.cpu)
}
if memprofile != "" {
f, err := os.Create(memprofile)
if err != nil {
log.Fatalf("memprofile: %v", err)
}
log.Printf("writing mem profile to: %s\n", memprofile)
prof.mem = f
runtime.MemProfileRate = 4096
}
}
// StopProfile closes the cpu and memory profiles if they are running.
func stopProfile() {
if prof.cpu != nil {
pprof.StopCPUProfile()
prof.cpu.Close()
log.Println("CPU profile stopped")
}
if prof.mem != nil {
pprof.Lookup("heap").WriteTo(prof.mem, 0)
prof.mem.Close()
log.Println("mem profile stopped")
}
}