Golang使用PGO优化程序性能

package main

import (
    "fmt"
    "math/rand"
    "time"
)

func init() {
    rand.Seed(time.Now().UnixNano())
}

func expensiveComputation() int {
    // 模拟耗时计算
    time.Sleep(time.Duration(rand.Intn(100)) * time.Millisecond)
    return rand.Intn(100)
}

func main() {
    start := time.Now()

    // 假设我们需要并发执行10次这个耗时计算
    results := make([]int, 10)
    for i := range results {
        results[i] = expensiveComputation()
    }

    elapsed := time.Since(start)
    fmt.Printf("Total time taken: %s\n", elapsed)

    // 计算结果的平均值
    sum := 0
    for _, result := range results {
        sum += result
    }
    average := sum / len(results)
    fmt.Printf("Average result: %d\n", average)
}