To enable contetion profiling you need to add line ```rt.SetBlockProfileRate(1)```to ones added before (```rt``` stands for ```runtime``` in ```master.go```). This enables 'debug/pprof/block' subpage, which can be used as an input go to ```go tool pprof```.
To enable contetion profiling you need to add line ```rt.SetBlockProfileRate(1)```in addition to ```m.mux.HandleFunc(...)``` added before (```rt``` stands for ```runtime``` in ```master.go```). This enables 'debug/pprof/block' subpage, which can be used as an input to ```go tool pprof```.