golang time.After资源泄露描述

最新推荐文章于 2025-05-02 11:13:23 发布

转载最新推荐文章于 2025-05-02 11:13:23 发布 · 972 阅读

本文通过一个Go语言示例程序展示了如何使用runtime包监测内存使用情况，并通过goroutine数量及分配的字节数来检查潜在的资源泄露问题。

转自：https://groups.google.com/forum/#!topic/golang-nuts/cCdm0Ixwi9A
资源泄露是指，未到指定的时间，内存资源不释放

package main

import (
    "time"
    "fmt"
    "runtime"
)

func main() {

    var ms runtime.MemStats
    runtime.ReadMemStats(&ms)
    fmt.Println("before, have", runtime.NumGoroutine(), "goroutines,", ms.Alloc, "bytes allocated")
    for i := 0; i < 1000000; i++ {
        time.After(time.Hour)
    }
    runtime.GC()
    runtime.ReadMemStats(&ms)
    fmt.Println("after, have", runtime.NumGoroutine(), "goroutines,", ms.Alloc, "bytes allocated")

    time.Sleep(time.Minute) // uncomment this if you want to check memory usage externally, like with top
}