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
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问题描述
<$ (
fmt
运行时
同步
$ b)
$
$ b var wg sync.WaitGroup
func doTasks(){
fmt.Println(做任务)
for ji:= 1; ji<亿; ji ++ {
for io:= 1; io< 10; io ++ {
//一些计算
}
}
runtime.Gosched()
wg.Done()
}
func main(){
wg.Add(1)
runtime.GOMAXPROCS(1)//或2或4
go doTasks()
doTasks() )
wg.Wait()
}
解决方案
进程可以在给定时间运行的最大数量的逻辑CPU不超过 runtime.GOMAXPROCS(0)
和 runtime.NumCPU()
。
func MaxParallelism()int {
maxProcs:= runtime.GOMAXPROCS(0)
numCPU:= runtime.NumCPU()
if maxProcs< numCPU {
return maxProcs
}
return numCPU
}
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()
}
解决方案
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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