Benchmark Profiling

Using benchmarks you can profile your programs and see exactly where your performance or memory is being taken.

Profiling Commands

CPU Profiling

Run the benchmark.

$ go test -run none -bench . -benchtime 3s -benchmem -cpuprofile p.out

Run the pprof tool using the command line tooling.

$ go tool pprof p.out

Run these pprof commands.

(pprof) list algOne
(pprof) web list algOne

Run the pprof tool using the browser based tooling.

$ go tool pprof -http :3000 p.out

Navigate the drop down menu in the UI.

Run the pprof tool using including the memcpu.test binary.

$ go tool pprof -http :3000 memcpu.test p.out

When you do this, you can get profiling information down to the assembly level.

Memory Profiling

Run the benchmark.

$ go test -run none -bench . -benchtime 3s -benchmem -memprofile p.out

Run the pprof tool.

$ go tool pprof -<OPTIONAL_PICK_MEM_PROFILE> p.out

Run these pprof commands.

(pprof) list algOne
(pprof) web list algOne

Run the pprof tool using the browser based tooling.

$ go tool pprof -<OPTIONAL_PICK_MEM_PROFILE> -http :3000 p.out

Navigate the drop down menu in the UI.

Run the pprof tool using including the memcpu.test binary.

$ go tool pprof -<OPTIONAL_PICK_MEM_PROFILE> -http :3000 memcpu.test p.out

When you do this, you can get profiling information down to the assembly level.

Documentation of memory profile options.

// Useful to see pressure on heap over time.
-alloc_space  : All allocations happened since program start ** default
-alloc_objects: Number of object allocated at the time of profile

// Useful to see current status of heap.
-inuse_space  : Allocations live at the time of profile
-inuse_objects: Number of bytes allocated at the time of profile

If you want to reduce memory consumption, look at the -inuse_space profile collected during normal program operation.

If you want to improve execution speed, look at the -alloc_objects profile collected after significant running time or at program end.

Code Review

Profiling ( Go Playground) | Profiling Test ( Go Playground)

All material is licensed under the Apache License Version 2.0, January 2004.