Profiling

Available Tools

• gem detailed_benchmarks
• gem memory_profiler
• gem mini-profiler

Derailed Benchmarks Gem

https://github.com/schneems/derailed_benchmarks

To see gem memory usage

bundle exec derailed bundle:mem

Runtime memory usage for the app

bundle exec derailed bundle:objects

Convert to MB. Example crowdAI's gems use 105.59MB for gems alone.

https://github.com/presidentbeef/brakeman

Do I have a memory leak?

Using the derailed_benchmarks gem, run increasing numbers of tests. If the memory usage is not stable there is a leak.

TEST_COUNT=5000 bundle exec derailed exec perf:mem_over_time
TEST_COUNT=10_000 bundle exec derailed exec perf:mem_over_time
TEST_COUNT=20_000 bundle exec derailed exec perf:mem_over_time