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race

Posted by 夏泽民 Aug 18, 2019

比如一个全局变量，如果没有加上锁，我们写一个比较庞大的项目下来，就根本不知道这个变量是不是会引起多个goroutine竞争。 package main

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make new 的区别

Posted by 夏泽民 Aug 18, 2019

二者都在堆上分配内存，但是它们的行为不同，适用于不同的类型。

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interface

Posted by 夏泽民 Aug 18, 2019

golang中的接口分为带方法的接口和空接口。 带方法的接口在底层用iface表示，空接口的底层则是eface表示。 //runtime/runtime2.go

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flame graph

Posted by 夏泽民 Aug 18, 2019

安装go-torch go get github.com/uber/go-torch 安装 FlameGraph cd $WORK_PATH && git clone https://github.com/brendangregg/FlameGraph.git export PATH=$PATH:$WORK_PATH/FlameGraph-master 安装graphviz yum install graphviz(CentOS, Redhat) package main

import ( “net/http” “net/http/pprof” )

func main() { // 主函数中添加 go func() { http.HandleFunc(“/debug/pprof/block”, pprof.Index) http.HandleFunc(“/debug/pprof/goroutine”, pprof.Index) http.HandleFunc(“/debug/pprof/heap”, pprof.Index) http.HandleFunc(“/debug/pprof/threadcreate”, pprof.Index)

    http.ListenAndServe("0.0.0.0:8888", nil)
}()
 
var finishWaiter chan int
<-finishWaiter }
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defer

Posted by 夏泽民 Aug 18, 2019

defer的行为规则，只有三条 规则一：延迟函数的参数在defer语句出现时就已经确定下来了 官方给出一个例子，如下所示：

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