gowallet/main.go at master · coderbradlee/gowallet · GitHub

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package main

import (
	"log"
	"runtime"
	"time"
)

//func f() {
////	container := make([]int, 8)
////	log.Println("> loop.")
////	// slice会动态扩容，用它来做堆内存的申请
////	for i := 0; i < 32*1000*1000; i++ {
////		container = append(container, i)
////	}
////	log.Println("< loop.")
////	// container在f函数执行完毕后不再使用
////}
////func testfmt() {
////	log.Println("start.")
////	f()
////
////	log.Println("force gc.")
////	runtime.GC() // 调用强制gc函数
////
////	log.Println("done.")
////	time.Sleep(1 * time.Hour) // 保持程序不退出
////}
func traceMemStats() {
	var ms runtime.MemStats
	runtime.ReadMemStats(&ms)
	log.Printf("Alloc:%d(bytes) HeapIdle:%d(bytes) HeapReleased:%d(bytes)", ms.Alloc, ms.HeapIdle, ms.HeapReleased)
}

func f() {
	container := make([]int, 8)
	log.Println("> loop.")
	for i := 0; i < 32*1000*1000; i++ {
		container = append(container, i)
		if i == 16*1000*1000 {
			traceMemStats()

		}
	}
	log.Println("< loop.")
}
func main() {
	log.Println("start.")
	traceMemStats()
	f()
	traceMemStats()

	log.Println("force gc.")
	runtime.GC()

	log.Println("done.")
	traceMemStats()

	go func() {
		for {
			traceMemStats()
			time.Sleep(10 * time.Second)
		}
	}()

	time.Sleep(1 * time.Hour)
}

//
////
////import (
////	"log"
////	"net/http"
////
////	"github.com/prometheus/client_golang/prometheus"
////	"github.com/prometheus/client_golang/prometheus/promhttp"
////)
////
////var (
////	cpuTemp = prometheus.NewGauge(prometheus.GaugeOpts{
////		Name: "cpu_temperature_celsius",
////		Help: "Current temperature of the CPU.",
////	})
////	hdFailures = prometheus.NewCounterVec(
////		prometheus.CounterOpts{
////			Name: "hd_errors_total",
////			Help: "Number of hard-disk errors.",
////		},
////		[]string{"device"},
////	)
////)
////
////func init() {
////	// Metrics have to be registered to be exposed:
////	prometheus.MustRegister(cpuTemp)
////	prometheus.MustRegister(hdFailures)
////}
////
////func main() {
////	cpuTemp.Set(65.3)
////	hdFailures.With(prometheus.Labels{"device": "/dev/sda"}).Inc()
////
////	// The Handler function provides a default handler to expose metrics
////	// via an HTTP server. "/metrics" is the usual endpoint for that.
////	http.Handle("/metrics", promhttp.Handler())
////	log.Fatal(http.ListenAndServe(":8080", nil))
////}
//func main() {
//	//go func() {
//	//	http.ListenAndServe(":8088", nil)
//	//}()
//	//for i := 0; i < 100; i++ {
//	//	time.Sleep(time.Second)
//	//	fmt.Println(":", i)
//	//}
//	//ch := make(chan string)
//	//<-ch
//
//	var count int32 = 0
//	server := &http.Server{
//		Addr: ":4444",
//		Handler: http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
//			rw.Header().Set("Connection", "close")
//		}),
//		ConnContext: func(ctx context.Context, c net.Conn) context.Context {
//			atomic.AddInt32(&count, 1)
//			if c2 := ctx.Value("count"); c2 != nil {
//				fmt.Printf("发现了遗留数据: %d\n", c2.(int32))
//			}
//			fmt.Printf("本次数据: %d\n", count)
//			return context.WithValue(ctx, "count", count)
//		},
//	}
//	go func() {
//		panic(server.ListenAndServe())
//	}()
//
//	var err error
//
//	fmt.Println("第一次请求")
//	_, err = http.Get("http://localhost:4444/")
//	if err != nil {
//		panic(err)
//	}
//	fmt.Println("\n第二次请求")
//
//	_, err = http.Get("http://localhost:4444/")
//	if err != nil {
//		panic(err)
//	}
//}