56 lines
2.1 KiB
Markdown
56 lines
2.1 KiB
Markdown
# Profiling
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To make it easier to track down performance problems GitLab comes with a set of
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profiling tools, some of these are available by default while others need to be
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explicitly enabled.
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## rack-mini-profiler
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This Gem is enabled by default in development only. It allows you to see the
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timings of the various components that made up a web request (e.g. the SQL
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queries executed and their execution timings).
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## Bullet
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Bullet is a Gem that can be used to track down N+1 query problems. Because
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Bullet adds quite a bit of logging noise it's disabled by default. To enable
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Bullet, set the environment variable `ENABLE_BULLET` to a non-empty value before
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starting GitLab. For example:
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ENABLE_BULLET=true bundle exec rails s
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Bullet will log query problems to both the Rails log as well as the Chrome
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console.
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## ActiveRecord Query Trace
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This Gem adds backtraces for every ActiveRecord query in the Rails console. This
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can be useful to track down where a query was executed. Because this Gem adds
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quite a bit of noise (5-10 extra lines per ActiveRecord query) it's disabled by
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default. To use this Gem you'll need to set `ENABLE_QUERY_TRACE` to a non empty
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file before starting GitLab. For example:
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ENABLE_QUERY_TRACE=true bundle exec rails s
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## rack-lineprof
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This is a Gem that can trace the execution time of code on a per line basis.
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Because this Gem can add quite a bit of overhead it's disabled by default. To
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enable it, set the environment variable `ENABLE_LINEPROF` to a non-empty value.
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For example:
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ENABLE_LINEPROF=true bundle exec rails s
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Once enabled you'll need to add a query string parameter to a request to
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actually profile code execution. The name of the parameter is `lineprof` and
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should be set to a regular expression (minus the starting/ending slash) used to
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select what files to profile. To profile all files containing "foo" somewhere in
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the path you'd use the following parameter:
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?lineprof=foo
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Or when filtering for files containing "foo" and "bar" in their path:
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?lineprof=foo|bar
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Once set the profiling output will be displayed in your terminal.
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