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-# Benchmarking
-
-GitLab CE comes with a set of benchmarks that are executed for every build. This
-makes it easier to measure performance of certain components over time.
-
-Benchmarks are written as RSpec tests using a few extra helpers. To write a
-benchmark, first tag the top-level `describe`:
-
-```ruby
-describe MaruTheCat, benchmark: true do
-
-end
-```
-
-This ensures the benchmark is executed separately from other test collections.
-It also exposes the various RSpec matchers used for writing benchmarks to the
-test group.
-
-Next, lets write the actual benchmark:
-
-```ruby
-describe MaruTheCat, benchmark: true do
-  let(:maru) { MaruTheChat.new }
-
-  describe '#jump_in_box' do
-    benchmark_subject { maru.jump_in_box }
-
-    it { is_expected.to iterate_per_second(9000) }
-  end
-end
-```
-
-Here `benchmark_subject` is a small wrapper around RSpec's `subject` method that
-makes it easier to specify the subject of a benchmark. Using RSpec's regular
-`subject` would require us to write the following instead:
-
-```ruby
-subject { -> { maru.jump_in_box } }
-```
-
-The `iterate_per_second` matcher defines the amount of times per second a
-subject should be executed. The higher the amount of iterations the better.
-
-By default the allowed standard deviation is a maximum of 30%. This can be
-adjusted by chaining the `with_maximum_stddev` on the `iterate_per_second`
-matcher:
-
-```ruby
-it { is_expected.to iterate_per_second(9000).with_maximum_stddev(50) }
-```
-
-This can be useful if the code in question depends on external resources of
-which the performance can vary a lot (e.g. physical HDDs, network calls, etc).
-However, in most cases 30% should be enough so only change this when really
-needed.
-
-## Benchmarks Location
-
-Benchmarks should be stored in `spec/benchmarks` and should follow the regular
-Rails specs structure. That is, model benchmarks go in `spec/benchmark/models`,
-benchmarks for code in the `lib` directory go in `spec/benchmarks/lib`, etc.
-
-## Underlying Technology
-
-The benchmark setup uses [benchmark-ips][benchmark-ips] which takes care of the
-heavy lifting such as warming up code, calculating iterations, standard
-deviation, etc.
-
-[benchmark-ips]: https://github.com/evanphx/benchmark-ips