提高Go语言应用程序性能的关键技术：内存优化和垃圾回收

package main

import (
    "fmt"
    "sync"
)

func main() {
    slice := make([]int, 0, 100)
    for i := 0; i < 100; i++ {
        slice = append(slice, i)
    }

    // 使用sync.Pool重用临时对象
    pool := &sync.Pool{
        New: func() interface{} {
            return make([]int, 0, 100)
        },
    }
    for i := 0; i < 100; i++ {
        tempSlice := pool.Get().([]int)
        tempSlice = tempSlice[:0]
        tempSlice = append(tempSlice, i)
        fmt.Println(tempSlice)
        pool.Put(tempSlice)
    }
}

package main

import (
    "fmt"
    "runtime"
    "time"
)

func main() {
    go func() {
        for {
            // 执行任务
            time.Sleep(time.Second)
        }
    }()

    // 等待程序退出
    ch := make(chan struct{})
    go func() {
        for {
            var memStat runtime.MemStats
            runtime.ReadMemStats(&memStat)
            fmt.Printf("HeapAlloc: %d
", memStat.HeapAlloc)
            time.Sleep(time.Second)
        }
    }()

    <-ch
}

package main

import (
    "fmt"
    "runtime"
    "time"
)

func main() {
    fmt.Println("GOGC:", runtime.GOGC)

    // 设置GOGC的值为100
    runtime.SetGCPercent(100)
    fmt.Println("GOGC:", runtime.GOGC)

    go func() {
        var memStat runtime.MemStats
        for {
            runtime.ReadMemStats(&memStat)
            fmt.Printf("HeapAlloc: %d
", memStat.HeapAlloc)
            time.Sleep(time.Second)
        }
    }()

    select {}
}