35 lines
703 B
Go
35 lines
703 B
Go
package main
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import (
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"fmt"
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"runtime"
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"sync"
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"time"
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)
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func main() {
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fmt.Printf("当前Go版本：%s\n", runtime.Version())
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// 设置P的数量为2
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runtime.GOMAXPROCS(1)
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// 再获取当前值
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fmt.Printf("CPU 核心数: %d, GOMAXPROCS: %d\n", runtime.NumCPU(), runtime.GOMAXPROCS(-1))
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var wg sync.WaitGroup
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startTime := time.Now()
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// 创建4个CPU密集型任务
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for i := 0; i < 4; i++ {
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wg.Add(1)
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go func(id int) {
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defer wg.Done()
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// 模拟CPU密集型计算
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sum := 0
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for j := 0; j < 1000000000; j++ {
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sum += j
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}
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fmt.Printf("任务%d 完成，耗时: %v\n", id, time.Since(startTime))
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}(i)
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}
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wg.Wait()
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fmt.Printf("总耗时: %v\n", time.Since(startTime))
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}
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