P - processor, a resource that is required to execute Go code. 一般一个进程
M - worker thread, or machine. 根据cpu情况创建，一般小于10个线程，请求越多Thread越多， goroutine越多Thread也越多
G - goroutine.
Each goroutine (G) runs on an OS thread (M) that is assigned to a logical CPU (P)

cd pprof/http or cd pprof/gin
go build -o main // 编译程序
./main & // 运行程序
go tool pprof main // 预设查看信息
- http://127.0.0.1:6060/debug/pprof/ //查看全部支持的profile
- go tool pprof main http://127.0.0.1:6060/debug/pprof/profile // 预设查看cpu profile
- go tool pprof main http://127.0.0.1:6060/debug/pprof/heap // 预设查看heap profile
- go tool pprof main http://127.0.0.1:6060/debug/pprof/threadcreate // 预设查看thread
- go tool pprof main http://127.0.0.1:6060/debug/pprof/goroutine //预设查看goroutines信息
- wget http://localhost:6060/debug/pprof/trace\?seconds\=10 -O ./trace // 预设查看trace profile
ab 测试 // 请求程序
- ab -k -c 8 -n 100000 "http://127.0.0.1:6060/concat/?str=test&count=50" &
- ab -k -c 8 -n 100000 "http://127.0.0.1:6060/fib/?n=50&type=recursive" &
- ab -k -c 8 -n 100000 "http://127.0.0.1:6060/fib/?n=50&type=iterative" &
用pprof visualization tool 可视化数据
- go tool pprof -http=:8080 ./pprof.pprof.samples.cpu.001.pb.gz
- go tool trace ./trace

cpu: 查看cpu profile
- go tool pprof main http://127.0.0.1:6060/debug/pprof/profile
- CPU profile determines where a program spends its time while actively consuming CPU cycles
heap:
- go tool pprof main http://127.0.0.1:6060/debug/pprof/heap
- Heap profile reports memory allocation samples; used to monitor current and historical memory usage
threadcreate:
- Thread creation profile reports the sections of the program that lead the creation of new OS threads.
goroutine:
- wget http://localhost:6060/debug/pprof/trace?seconds=5
- Goroutine profile reports the stack traces of all current goroutines.
block:
- Block profile shows where goroutines block waiting on synchronization primitives.
- Block profile is not enabled by default; use runtime.SetBlockProfileRate to enable it.

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