pprof is finished but not review

pprof/pprof.go

@@ -17,39 +17,46 @@ func logicCode() {
 		case v := <-c: //阻塞
 			fmt.Printf("recv from chan, value:%v\n", v)
 		default:
+			//time.Sleep(time.Millisecond * 500) //优化
 
 		}
 	}
 }
 
 func main() {
-	var isCPUPprof bool
+	var isCPUPprof bool //是否开启内存profile的标志位
-	var isMemPprof bool
+	var isMemPprof bool //是否开启内存profile的标志位
 
 	flag.BoolVar(&isCPUPprof, "cpu", false, "turn cpu pprof on")
 	flag.BoolVar(&isMemPprof, "mem", false, "turn mem pprof on")
 	flag.Parse()
 
 	if isCPUPprof {
-		file, err := os.Create("./cpu.pprof")
+		f1, err := os.Create("./cpu.pprof") //在当前目录创建cpu.pprof文件
 		if err != nil {
 			fmt.Printf("create cpu pprof failed, err:%v\n", err)
 			return
 		}
-		pprof.StartCPUProfile(file)
+		pprof.StartCPUProfile(f1) //往文件中记录cpu的信息
-		defer pprof.StopCPUProfile()
+		defer func() {
+			pprof.StopCPUProfile()
+			f1.Close()
+		}() //main函数退出之后结束
 	}
 	for i := 0; i < 8; i++ {
 		go logicCode()
 	}
 	time.Sleep(20 * time.Second)
 	if isMemPprof {
-		file, err := os.Create("./mem.pprof")
+		f2, err := os.Create("./mem.pprof")
 		if err != nil {
 			fmt.Printf("create mem pprof failed, err:%v\n", err)
 			return
 		}
-		pprof.WriteHeapProfile(file)
+		pprof.WriteHeapProfile(f2)
-		file.Close()
+		f2.Close()
 	}
 }
+
+//生成文件之后用 go tool pprof cpu.pprof
+//list logicCode 查看哪一行执行时间长