mirror of
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
72 lines
1.9 KiB
Go
72 lines
1.9 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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"sync/atomic"
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"time"
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"golang.org/x/sys/unix"
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)
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type ring struct {
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writeSeq atomic.Uint64
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cap uint64
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slots []uint64
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}
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func main() {
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fmt.Println("=== 实验 4：事件环 post-and-forget vs 同步 Publish（慢消费者场景）===")
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const tokens = 5000
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// --- A. 现状：同步 Publish，消费者慢 ---
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slowHandler := func() { time.Sleep(20 * time.Microsecond) }
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t0 := time.Now()
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for i := 0; i < tokens; i++ { slowHandler() }
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syncDur := time.Since(t0)
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fmt.Printf("A 同步 Publish (慢消费者 20µs): %d token 耗时 %v → 均摊 %.1f µs/token\n",
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tokens, syncDur, float64(syncDur.Microseconds())/tokens)
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// --- B. 新方案：写环 + eventfd post，不等消费者 ---
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r := &ring{cap: 1024, slots: make([]uint64, 1024)}
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efd, _ := unix.Eventfd(0, unix.EFD_NONBLOCK)
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f := os.NewFile(uintptr(efd), "e")
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var dropped atomic.Uint64
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// 慢消费者 goroutine
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done := make(chan struct{})
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go func() {
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buf := make([]byte, 8)
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var readSeq uint64
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for {
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if _, err := f.Read(buf); err != nil { return }
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w := r.writeSeq.Load()
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if w-readSeq > r.cap {
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dropped.Add(w - readSeq - r.cap)
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readSeq = w - r.cap
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}
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for readSeq < w { readSeq++ }
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time.Sleep(20 * time.Microsecond) // 慢
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select { case <-done: return; default: }
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}
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}()
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t0 = time.Now()
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one := []byte{1,0,0,0,0,0,0,0}
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for i := 0; i < tokens; i++ {
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s := r.writeSeq.Add(1)
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r.slots[s%r.cap] = s // 写数据
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f.Write(one) // post，不等
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}
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asyncDur := time.Since(t0)
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close(done)
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fmt.Printf("B 环+eventfd post: %d token 耗时 %v → 均摊 %.2f µs/token\n",
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tokens, asyncDur, float64(asyncDur.Microseconds())/tokens)
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fmt.Printf("\n加速比 %.1fx 丢弃事件 %d（消费者跟不上，已计数）\n",
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float64(syncDur)/float64(asyncDur), dropped.Load())
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if asyncDur < syncDur/5 {
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fmt.Println("✅ post-and-forget 使流式发布与消费者速度解耦")
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}
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}
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