// bulma/atomic_stress_test_demo.go
package main

import (
	"fmt"
	"sync"
	"sync/atomic"
	"time"
)

func main() {
	var counter atomic.Uint64
	var wg sync.WaitGroup

	// 压力测试配置：10000个goroutine，每个累加1000次，总计1亿次操作
	goroutineNum := 10000
	perGoroutineOps := 1000
	wg.Add(goroutineNum)

	start := time.Now()
	for i := 0; i < goroutineNum; i++ {
		go func() {
			defer wg.Done()
			for j := 0; j < perGoroutineOps; j++ {
				counter.Add(1) // 默认使用OrderSeqCst，安全稳定
			}
		}()
	}

	wg.Wait()
	cost := time.Since(start)
	expected := uint64(goroutineNum * perGoroutineOps)
	actual := counter.Load()

	// 验证结果：判断实际计数与预期计数是否一致，验证原子操作稳定性
	fmt.Printf("压力测试完成：%d个goroutine，每个执行%d次累加\n", goroutineNum, perGoroutineOps)
	fmt.Printf("预期计数: %d\n", expected)
	fmt.Printf("实际计数: %d\n", actual)
	fmt.Printf("执行耗时: %v\n", cost)
	fmt.Printf("操作吞吐量: %.2f万次/毫秒\n", float64(expected)/float64(cost.Milliseconds()))

	if actual == expected {
		fmt.Println("原子操作稳定可靠，无数据竞争！")
	} else {
		fmt.Printf("原子操作异常，计数偏差: %d\n", expected-actual)
	}
}