56 lines
972 B
Go
56 lines
972 B
Go
// runtime_pprof/os.args.go
|
|
package main
|
|
|
|
import (
|
|
"flag"
|
|
"fmt"
|
|
"os"
|
|
"runtime/pprof"
|
|
"time"
|
|
)
|
|
|
|
// 一段有问题的代码
|
|
func logicCode() {
|
|
var c chan int //nil 未初始化
|
|
for {
|
|
select {
|
|
case v := <-c: //阻塞
|
|
fmt.Printf("recv from chan, value:%v\n", v)
|
|
default:
|
|
|
|
}
|
|
}
|
|
}
|
|
|
|
func main() {
|
|
var isCPUPprof bool
|
|
var isMemPprof bool
|
|
|
|
flag.BoolVar(&isCPUPprof, "cpu", false, "turn cpu pprof on")
|
|
flag.BoolVar(&isMemPprof, "mem", false, "turn mem pprof on")
|
|
flag.Parse()
|
|
|
|
if isCPUPprof {
|
|
file, err := os.Create("./cpu.pprof")
|
|
if err != nil {
|
|
fmt.Printf("create cpu pprof failed, err:%v\n", err)
|
|
return
|
|
}
|
|
pprof.StartCPUProfile(file)
|
|
defer pprof.StopCPUProfile()
|
|
}
|
|
for i := 0; i < 8; i++ {
|
|
go logicCode()
|
|
}
|
|
time.Sleep(20 * time.Second)
|
|
if isMemPprof {
|
|
file, err := os.Create("./mem.pprof")
|
|
if err != nil {
|
|
fmt.Printf("create mem pprof failed, err:%v\n", err)
|
|
return
|
|
}
|
|
pprof.WriteHeapProfile(file)
|
|
file.Close()
|
|
}
|
|
}
|