准备工资
安装graphviz
brew install graphviz
讲$GOPATH/bin 加入$PATH
mac OS ：在.bash_profile中修改路径
安装 go-torch
go get github.com/uber/go-torch
go get github.com/uber/go-torch
下载并且复制 flamegraph.pl（https://github.com/brendangregg/FlameGraph）至 $GOPATH/bin 路径下
将$GOPATH/bin 加入$PATH