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Profiling
To make it easier to track down performance problems GitLab comes with a set of profiling tools, some of these are available by default while others need to be explicitly enabled.
Sherlock
Sherlock is a custom profiling tool built into GitLab. Sherlock is only
available when running GitLab in development mode and when setting the
environment variable ENABLE_SHERLOCK to a non empty value. For example:
ENABLE_SHERLOCK=1 bundle exec rails s
Recorded transactions can be found by navigating to /sherlock/transactions.
Bullet
Bullet is a Gem that can be used to track down N+1 query problems. Because
Bullet adds quite a bit of logging noise it's disabled by default. To enable
Bullet, set the environment variable ENABLE_BULLET to a non-empty value before
starting GitLab. For example:
ENABLE_BULLET=true bundle exec rails s
Bullet will log query problems to both the Rails log as well as the Chrome console.
As a follow up to finding N+1 queries with Bullet, consider writing a QueryRecoder test to prevent a regression.