package main
import (
   "flag"
   "fmt"
   "github.com/gogf/gf/os/grpool"
   "github.com/gogf/gf/os/gtime"
   "log"
   "os"
   "runtime"
   "runtime/pprof"
   "sync"
   "time"
)
func main() {
   //接收命令行參數
   flag.Parse()
   //cpu分析
   cpuProfile()
   //主邏輯
   //demoGrpool()
   demoGoroutine()
   //內存分析
   memProfile()
}
func demoGrpool() {
   start := gtime.TimestampMilli()
   wg := sync.WaitGroup{}
   for i := 0; i < 10000; i++ {
      wg.Add(1)
      _ = grpool.Add(func() {
         var m runtime.MemStats
         runtime.ReadMemStats(&m)
         fmt.Printf("運行中占用內存：%d Kb\n", m.Alloc/1024)
         time.Sleep(time.Millisecond)
         wg.Done()
      })
      fmt.Printf("運行的協程：", grpool.Size())
   }
   wg.Wait()
   fmt.Printf("運行的時間：%v ms \n", gtime.TimestampMilli()-start)
   select {}
}
func demoGoroutine() {
   //start := gtime.TimestampMilli()
   wg := sync.WaitGroup{}
   for i := 0; i < 10000; i++ {
      wg.Add(1)
      go func() {
         //var m runtime.MemStats
         //runtime.ReadMemStats(&m)
         //fmt.Printf("運行中占用內存：%d Kb\n", m.Alloc/1024)
         time.Sleep(time.Millisecond)
         wg.Done()
      }()
   }
   wg.Wait()
   //fmt.Printf("運行的時間：%v ms \n", gtime.TimestampMilli()-start)
}
var cpuprofile = flag.String("cpuprofile", "", "write cpu profile `file`")
var memprofile = flag.String("memprofile", "", "write memory profile to `file`")
func cpuProfile() {
   if *cpuprofile != "" {
      f, err := os.Create(*cpuprofile)
      if err != nil {
         log.Fatal("could not create CPU profile: ", err)
      }
      if err := pprof.StartCPUProfile(f); err != nil { //監控cpu
         log.Fatal("could not start CPU profile: ", err)
      }
      defer pprof.StopCPUProfile()
   }
}
func memProfile() {
   if *memprofile != "" {
      f, err := os.Create(*memprofile)
      if err != nil {
         log.Fatal("could not create memory profile: ", err)
      }
      runtime.GC()                                      // GC，獲取最新的數據信息
      if err := pprof.WriteHeapProfile(f); err != nil { // 寫入內存信息
         log.Fatal("could not write memory profile: ", err)
      }
      f.Close()
   }
}