runtime trace

Author: researchlab

pprof/03-trace.go

@@ -0,0 +1,44 @@
+package main
+
+import (
+	"flag"
+	"log"
+	"os"
+	"runtime"
+	"runtime/trace"
+	"sync"
+)
+
+func counter(wg *sync.WaitGroup) {
+	wg.Done()
+	slice := []int{0}
+	c := 1
+	for i := 0; i < 100000; i++ {
+		mutex.Lock()
+		c = i + 1 + 2 + 3 + 4 + 5
+		slice = append(slice, c)
+		mutex.Unlock()
+	}
+}
+
+func main() {
+	runtime.GOMAXPROCS(5)
+	var traceProfile = flag.String("traceprofile", "", "write trace profile to file")
+	flag.Parse()
+	if *traceProfile != "" {
+		f, err := os.Create(*traceProfile)
+		if err != nil {
+			log.Fatal(err)
+		}
+		trace.Start(f)
+		defer f.Close()
+		defer trace.Stop()
+	}
+
+	var wg sync.WaitGroup
+	wg.Add(3)
+	for i := 0; i < 3; i++ {
+		go counter(&wg)
+	}
+	wg.Wait()
+}