= golang

go test -cover -race -shuffle=on -vet=all -failfast <PACKAGES>

== race conditions, CPU profiling and memory profiling

## based on https://github.com/bradfitz/talk-yapc-asia-2015/blob/master/talk.md
1. Write tests to catch data races. Run
   $ go test -v
2. Run with race detector.
   $ go test -v -race
3. To fix data race problems use functional style, mutex or atomic
4. Write benchmarks to do some CPU profiling:
   $ go test -v -run=^$ -bench=.
5. Collect data about the CPU:
   $ go test -v -run=^$ -bench=. -benchtime=2s -cpuprofile=prof.cpu
6. Run pprof to read created demo.test
   $ go tool pprof demo.test prof.cpu
   > top
   > top --cum
   > list handleHi
   > web            # requires installation of graphviz
7. Memory profiling with --alloc_space
   $ go tool pprof --alloc_space demo.test prof.mem
   > top
   > top --cum
   > list BenchmarkHi
   > list handleHi