首次提交：初始化项目代码

gpm_homax_1.go

@@ -0,0 +1,51 @@
+package main
+
+import (
+	"fmt"
+	"runtime"
+	"sync"
+	"time"
+)
+
+var globalSum int64
+
+// 进一步增加循环次数，单任务耗时延长到10秒以上
+func longCPUTask(id int) {
+	localSum := int64(0)
+	loopCount := int64(500000000) * int64(id+1) // 循环次数：5e8→2e9（耗时≈10s→40s）
+	for j := int64(1); j < loopCount; j++ {
+		localSum = (localSum + j*j%987654321) * 1000000007 % 123456789
+		if j%100000000 == 0 { // 极低频率写入全局变量，最大化独占P时间
+			globalSum = localSum
+		}
+	}
+}
+
+func main() {
+	runtime.GOMAXPROCS(1)
+	var wg sync.WaitGroup
+	startTime := time.Now()
+	taskDurations := make([]time.Duration, 4)
+
+	for i := 0; i < 4; i++ {
+		wg.Add(1)
+		id := i
+		go func() {
+			defer wg.Done()
+			taskStart := time.Now()
+			longCPUTask(id)
+			taskDurations[id] = time.Since(taskStart)
+		}()
+	}
+
+	wg.Wait()
+	totalDuration := time.Since(startTime)
+
+	fmt.Println("GOMAXPROCS=1")
+	sumDurations := time.Duration(0)
+	for i := 0; i < 4; i++ {
+		fmt.Printf("任务%d 耗时: %v\n", i, taskDurations[i])
+		sumDurations += taskDurations[i]
+	}
+	fmt.Printf("总耗时: %v, 4个任务之和: %v（接近）\n", totalDuration, sumDurations)
+}