Golang:如何验证运行 Go 程序的处理器数量 [英] Golang: how to verify number of processors on which a Go program is running
问题描述
我是 Google Go (Golang) 的新手.我的问题与这篇文章有关 runtime.Gosched 到底做了什么?.代码结构复制如下.我的问题是,当我更改 GOMAXPROCS 中的处理器数量时,如何验证它正在运行的处理器数量.当我做 'top' 时,它显示了一个消耗 100% 或更少资源的.out 进程,即使 GOMAXPROCS 大于 1.我将非常感谢您的帮助.
I am new to Google Go (Golang). My question is related to this post What exactly does runtime.Gosched do?. The structure of code is as copied below. My question, is that when I change the number of processor in GOMAXPROCS, how do I verify how many processors it is running on. When I do 'top', it shows a.out process which consumes 100% or less resources even when GOMAXPROCS is more than 1. I would be grateful for your help.
package main
import (
"fmt"
"runtime"
"sync"
)
var wg sync.WaitGroup
func doTasks() {
fmt.Println(" Doing task ")
for ji := 1; ji < 100000000; ji++ {
for io := 1; io < 10; io++ {
//Some computations
}
}
runtime.Gosched()
wg.Done()
}
func main() {
wg.Add(1)
runtime.GOMAXPROCS(1) // or 2 or 4
go doTasks()
doTasks()
wg.Wait()
}
推荐答案
进程在给定时间内可以运行的最大逻辑 CPU 数量不超过 runtime.GOMAXPROCS(0)
和 runtime.NumCPU()
.
The largest number of logical CPUs the process can be running on at a given time is no more than the minimum of runtime.GOMAXPROCS(0)
and runtime.NumCPU()
.
func MaxParallelism() int {
maxProcs := runtime.GOMAXPROCS(0)
numCPU := runtime.NumCPU()
if maxProcs < numCPU {
return maxProcs
}
return numCPU
}
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