go cpu 源码
golang cpu 代码
文件路径：/src/cmd/pprof/testdata/cpu.go
// Copyright 2021 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
import (
"flag"
"fmt"
"os"
"runtime/pprof"
"time"
)
var output = flag.String("output", "", "pprof profile output file")
func main() {
flag.Parse()
if *output == "" {
fmt.Fprintf(os.Stderr, "usage: %s -output file.pprof\n", os.Args[0])
os.Exit(2)
}
f, err := os.Create(*output)
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(2)
}
defer f.Close()
if err := pprof.StartCPUProfile(f); err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(2)
}
defer pprof.StopCPUProfile()
// Spin for long enough to collect some samples.
start := time.Now()
for time.Since(start) < time.Second {
}
}
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