Golang多线程 计算单个goroutine的大小

package main

import (
    "fmt"
    "runtime"
    "sync"
)

func main() {
    memConsumed := func() uint64 {
        runtime.GC()
        var s runtime.MemStats
        runtime.ReadMemStats(&s)
        return s.Sys
    }

    var c <-chan interface{}
    var wg sync.WaitGroup
    noop := func() {
        wg.Done()
        <-c
    }

    const numGoroutines = 1e4
    wg.Add(numGoroutines)
    before := memConsumed()

    for i := numGoroutines; i > 0; i-- {
        go noop()
    }

    wg.Wait()
    after := memConsumed()
    fmt.Printf("%.3fkb", float64(after-before)/numGoroutines/1000)
    fmt.Println("")

}

程序输出如下，

image.png

上述结果表明，忽略goroutine中的内容占用内存，goroutine确实是非常的轻量级。