mumubin/go-learn.md

## go-learn.md

      
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              go-learn.md
            
          
    GO Test

go test -coverprofile=c.out             
go tool cover -html=c.out 

go test -bench . -cpuprofile=cpu.profile
go tool pprof cpu.profile

Example

func ExampleQueue_Pop() {
	q := Queue{1}
	q.Push(2)
	q.Push(3)
	fmt.Println(q.Pop())
	fmt.Println(q.Pop())
	fmt.Println(q.IsEmpty())
	fmt.Println(q.Pop())
	fmt.Println(q.IsEmpty())

	//Output:
	//1
	//2
	//false
	//31
	//true
}


goroutine可能切换的点


I/O,select
channel
等待锁
函数调用（有时）
runtime.Gosched()
只是参考，不保证切换，其它地方也不保证不切换

go run -race goroutine.go


传统同步机制

不要使用共享内存来同步数据，使用chan来同步

WaitGroup
Mutex
Cond

http 性能调优


pprof

http://localhost:8888/debug/pprof
import(
_ "net/http/pprof"
)

or
go tool pprof http://localhost:8888/debug/pprof/profile
go tool pprof http://localhost:8888/debug/pprof/heap

看文档

godoc -http :8888