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https://gitcode.com/JianFeeeee/HomeAgent.git
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304cad0648
- docs/zh/架构迁移评估.md: C ABI→子进程+共享内存完整迁移论证(1621行) - docs/zh/experiments/: 18项可复跑可行性实验(架构评估的所有数字来源) - plan.md §11: 11.1~11.9 插件架构缺陷修复清单(唯一权威编号) - main 保持干净,本批次为 update 特性分支的整改起点
59 lines
1.6 KiB
Go
59 lines
1.6 KiB
Go
//go:build ignore
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package main
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import (
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"fmt"
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"os"
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"runtime"
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"sync"
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"sync/atomic"
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"time"
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"golang.org/x/sys/unix"
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)
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func threads() int { e, _ := os.ReadDir("/proc/self/task"); return len(e) }
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func main() {
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fmt.Println("=== 实验 1：eventfd 是否走 Go netpoller（只 park goroutine 不占 OS 线程）===")
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base := threads()
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fmt.Printf("基线线程数: %d (GOMAXPROCS=%d)\n\n", base, runtime.GOMAXPROCS(0))
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const N = 200 // 模拟 200 个订阅者等待
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var wg sync.WaitGroup
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var woke int64
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files := make([]*os.File, N)
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for i := 0; i < N; i++ {
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efd, err := unix.Eventfd(0, unix.EFD_NONBLOCK|unix.EFD_CLOEXEC)
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if err != nil { fmt.Println("eventfd 失败:", err); return }
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f := os.NewFile(uintptr(efd), fmt.Sprintf("evt%d", i))
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files[i] = f
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wg.Add(1)
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go func(f *os.File) {
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defer wg.Done()
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buf := make([]byte, 8)
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// 阻塞读：若走 netpoller 只 park goroutine
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if _, err := f.Read(buf); err == nil {
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atomic.AddInt64(&woke, 1)
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}
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}(f)
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}
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time.Sleep(500 * time.Millisecond) // 让所有 goroutine 进入等待
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waiting := threads()
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fmt.Printf("%d 个 goroutine 阻塞在 eventfd.Read 后:\n", N)
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fmt.Printf(" 线程数 = %d (增长 %d)\n", waiting, waiting-base)
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if waiting-base < 20 {
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fmt.Println(" ✅ 走 netpoller：线程未随等待者数量增长")
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} else {
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fmt.Printf(" ❌ 退化为阻塞 syscall：每个等待者占一个 OS 线程\n")
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}
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// 全部唤醒
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one := []byte{1,0,0,0,0,0,0,0}
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for _, f := range files { f.Write(one) }
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wg.Wait()
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fmt.Printf("\n唤醒数 = %d/%d 唤醒后线程数 = %d\n", woke, N, threads())
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}
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