51 lines
1.0 KiB
Go
51 lines
1.0 KiB
Go
// bulma/atomic_counter.go
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package main
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import (
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"fmt"
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"sync"
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"sync/atomic"
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"time"
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)
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func main() {
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var atomicCounter atomic.Int64 // 原子计数器（新类型）
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var muCounter int64 // Mutex保护的计数器
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var mu sync.Mutex // 互斥锁
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// 原子操作计数
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start := time.Now()
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var wg sync.WaitGroup
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for i := 0; i < 1000; i++ {
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wg.Add(1)
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go func() {
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defer wg.Done()
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for j := 0; j < 1000; j++ {
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atomicCounter.Add(1)
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}
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}()
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}
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wg.Wait()
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atomicTime := time.Since(start)
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// Mutex 计数（对比）
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start = time.Now()
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for i := 0; i < 1000; i++ {
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wg.Add(1)
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go func() {
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defer wg.Done()
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for j := 0; j < 1000; j++ {
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mu.Lock()
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muCounter++
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mu.Unlock()
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}
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}()
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}
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wg.Wait()
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mutexTime := time.Since(start)
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fmt.Printf("✅ 原子计数: %d (耗时: %v)\n", atomicCounter.Load(), atomicTime)
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fmt.Printf("✅ Mutex计数: %d (耗时: %v)\n", muCounter, mutexTime)
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fmt.Printf("🚀 性能提升: %.1fx\n", float64(mutexTime)/float64(atomicTime))
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}
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