pytest-benchmark 5.2.3
A ``pytest`` fixture for benchmarking code. It will group the tests into rounds that are calibrated to the chosen timer.
Requires Python: >=3.9
Keywords: pytest, benchmark

========
Overview
========

.. list-table::
    :stub-columns: 1

    * - docs
      - |docs| |gitter|
    * - tests
      - |github-actions| |coveralls| |codecov|
    * - package
      - |version| |wheel| |supported-versions| |supported-implementations| |commits-since|
.. |docs| image:: https://readthedocs.org/projects/pytest-benchmark/badge/?style=flat
    :target: https://readthedocs.org/projects/pytest-benchmark/
    :alt: Documentation Status
.. |github-actions| image:: https://github.com/ionelmc/pytest-benchmark/actions/workflows/github-actions.yml/badge.svg
    :alt: GitHub Actions Build Status
    :target: https://github.com/ionelmc/pytest-benchmark/actions
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    :alt: Join the chat at https://gitter.im/ionelmc/pytest-benchmark
    :target: https://gitter.im/ionelmc/pytest-benchmark
.. |coveralls| image:: https://coveralls.io/repos/github/ionelmc/pytest-benchmark/badge.svg?branch=master
    :alt: Coverage Status
    :target: https://coveralls.io/github/ionelmc/pytest-benchmark?branch=master
.. |codecov| image:: https://codecov.io/gh/ionelmc/pytest-benchmark/branch/master/graphs/badge.svg?branch=master
    :alt: Coverage Status
    :target: https://app.codecov.io/github/ionelmc/pytest-benchmark
.. |version| image:: https://img.shields.io/pypi/v/pytest-benchmark.svg
    :alt: PyPI Package latest release
    :target: https://pypi.org/project/pytest-benchmark
.. |wheel| image:: https://img.shields.io/pypi/wheel/pytest-benchmark.svg
    :alt: PyPI Wheel
    :target: https://pypi.org/project/pytest-benchmark
.. |supported-versions| image:: https://img.shields.io/pypi/pyversions/pytest-benchmark.svg
    :alt: Supported versions
    :target: https://pypi.org/project/pytest-benchmark
.. |supported-implementations| image:: https://img.shields.io/pypi/implementation/pytest-benchmark.svg
    :alt: Supported implementations
    :target: https://pypi.org/project/pytest-benchmark
.. |commits-since| image:: https://img.shields.io/github/commits-since/ionelmc/pytest-benchmark/v5.2.3.svg
    :alt: Commits since latest release
    :target: https://github.com/ionelmc/pytest-benchmark/compare/v5.2.3...master

A ``pytest`` fixture for benchmarking code. It will group the tests into rounds that are calibrated to the chosen
timer.

See calibration_ and FAQ_.

* Free software: BSD 2-Clause License

Installation
============

::

    pip install pytest-benchmark

Documentation
=============

For latest release: `pytest-benchmark.readthedocs.org/en/stable <http://pytest-benchmark.readthedocs.org/en/stable/>`_.

For master branch (may include documentation fixes): `pytest-benchmark.readthedocs.io/en/latest <http://pytest-benchmark.readthedocs.io/en/latest/>`_.

Examples
========

But first, a prologue:

    This plugin tightly integrates into pytest. To use this effectively you should know a thing or two about pytest first.
    Take a look at the `introductory material <http://docs.pytest.org/en/latest/getting-started.html>`_
    or watch `talks <http://docs.pytest.org/en/latest/talks.html>`_.

    Few notes:

    * This plugin benchmarks functions and only that. If you want to measure block of code
      or whole programs you will need to write a wrapper function.
    * In a test you can only benchmark one function. If you want to benchmark many functions write more tests or
      use `parametrization <http://docs.pytest.org/en/latest/parametrize.html>`_.
    * To run the benchmarks you simply use `pytest` to run your "tests". The plugin will automatically do the
      benchmarking and generate a result table. Run ``pytest --help`` for more details.

This plugin provides a `benchmark` fixture. This fixture is a callable object that will benchmark any function passed
to it.

Example:

.. code-block:: python

    def something(duration=0.000001):
        """
        Function that needs some serious benchmarking.
        """
        time.sleep(duration)
        # You may return anything you want, like the result of a computation
        return 123

    def test_my_stuff(benchmark):
        # benchmark something
        result = benchmark(something)

        # Extra code, to verify that the run completed correctly.
        # Sometimes you may want to check the result, fast functions
        # are no good if they return incorrect results :-)
        assert result == 123

You can also pass extra arguments:

.. code-block:: python

    def test_my_stuff(benchmark):
        benchmark(time.sleep, 0.02)

Or even keyword arguments:

.. code-block:: python

    def test_my_stuff(benchmark):
        benchmark(time.sleep, duration=0.02)

Another pattern seen in the wild, that is not recommended for micro-benchmarks (very fast code) but may be convenient:

.. code-block:: python

    def test_my_stuff(benchmark):
        @benchmark
        def something():  # unnecessary function call
            time.sleep(0.000001)

A better way is to just benchmark the final function:

.. code-block:: python

    def test_my_stuff(benchmark):
        benchmark(time.sleep, 0.000001)  # way more accurate results!

If you need to do fine control over how the benchmark is run (like a `setup` function, exact control of `iterations` and
`rounds`) there's a special mode - pedantic_:

.. code-block:: python

    def my_special_setup():
        ...

    def test_with_setup(benchmark):
        benchmark.pedantic(something, setup=my_special_setup, args=(1, 2, 3), kwargs={'foo': 'bar'}, iterations=10, rounds=100)

Screenshots
-----------

Normal run:

.. image:: https://github.com/ionelmc/pytest-benchmark/raw/master/docs/screenshot.png
    :alt: Screenshot of pytest summary

Compare mode (``--benchmark-compare``):

.. image:: https://github.com/ionelmc/pytest-benchmark/raw/master/docs/screenshot-compare.png
    :alt: Screenshot of pytest summary in compare mode

Histogram (``--benchmark-histogram``):

.. image:: https://cdn.rawgit.com/ionelmc/pytest-benchmark/94860cc8f47aed7ba4f9c7e1380c2195342613f6/docs/sample-tests_test_normal.py_test_xfast_parametrized%5B0%5D.svg
    :alt: Histogram sample

..

    Also, it has `nice tooltips <https://cdn.rawgit.com/ionelmc/pytest-benchmark/master/docs/sample.svg>`_.

Development
===========

To run the all tests run::

    tox

Credits
=======

* Timing code and ideas taken from: https://github.com/vstinner/misc/blob/34d3128468e450dad15b6581af96a790f8bd58ce/python/benchmark.py

.. _FAQ: http://pytest-benchmark.readthedocs.org/en/latest/faq.html
.. _calibration: http://pytest-benchmark.readthedocs.org/en/latest/calibration.html
.. _pedantic: http://pytest-benchmark.readthedocs.org/en/latest/pedantic.html


Changelog
=========

v5.2.3 (2025-11-09)
--------------------

* Add support for pytest 9.0.
* Moved the README.rst/CHANGELOG.rst concatenation from setup.py to pyproject.toml.

v5.2.2 (2025-11-07)
--------------------

* Fixed auto-disable to work with newer xdist (pytest-benchmark auto disables benchmarks if xdist is enabled by design).
  Contributed by Thomas B. Brunner in `#294 <https://github.com/ionelmc/pytest-benchmark/pull/294>`_.

v5.2.1 (2025-11-04)
--------------------

* Add markers so pytest doesn't try to assert-rewrite the plugin internals
  (fixes those ``pytest.PytestAssertRewriteWarning: Module already imported so cannot be rewritten; pytest_benchmark`` warnings).

v5.2.0 (2025-10-30)
-------------------

* Added support for a per-round ``teardown`` function to pedantic mode.
  Contributed Patrick Winter by `#264 <https://github.com/ionelmc/pytest-benchmark/pull/264>`_.
* Added ``--benchmark-time-unit`` option.
  Contributed by Tony Kuo in `#281 <https://github.com/ionelmc/pytest-benchmark/pull/281>`_.
* Fixed deprecated hook examples in docstrings.
  Contributed by Ali-Akber Saifee in `#284 <https://github.com/ionelmc/pytest-benchmark/pull/284>`_.
* Changed ``--benchmark-compare-fail`` to accept percentages higher than 100%.
  Contributed by Ben Avrahami in `#280 <https://github.com/ionelmc/pytest-benchmark/pull/280>`_.
* Added minimal typing support.
  Contributed by Sorin Sbarnea in `#290 <https://github.com/ionelmc/pytest-benchmark/pull/290>`_.
* Fixed support for Python 3.9.
  Contributed by Enno Gotthold in `#291 <https://github.com/ionelmc/pytest-benchmark/pull/291>`_.
* Replaced the complicated and broken code of ``pytest_benchmark.utils.clonefunc`` with a simple return of the input.
  That function was supposed to allow benchmarking with the cost of PyPy JIT included but it's a hassle to maintain.
* Moved the instrumentation pause outside the round loops (in addition to tracing, profiling is paused too).
  Pedantic mode will keep doing this per round (as the user manually controls the round count).
  This is necessary because in some scenarios setting and unsetting the tracer too much will overflow an internal counter
  (found to cause "OverflowError: events set too many times" at least on Python 3.13).

v5.1.0 (2024-10-30)
-------------------

* Fixed broken hooks handling on pytest 8.1 or later (the ``TypeError: import_path() missing 1 required keyword-only argument: 'consider_namespace_packages'`` issue).
  Unfortunately this sets the minimum supported pytest version to 8.1.

v5.0.1 (2024-10-30)
-------------------

* Fixed bad fixture check that broke down then `nbmake <https://pypi.org/project/nbmake/>`_ was enabled.

v5.0.0 (2024-10-29)
-------------------

* Dropped support for now EOL Python 3.8. Also moved tests suite to only test the latest pytest versions (8.3.x).
* Fix generate parametrize tests benchmark csv report errors (issue `#268 <https://github.com/ionelmc/pytest-benchmark/issues/268>`_).
  Contributed by Johnny Huang in `#269 <https://github.com/ionelmc/pytest-benchmark/pull/269>`_.
* Added the ``--benchmark-time-unit`` cli option for overriding the measurement unit used for display.
  Contributed by Tony Kuo in `#257 <https://github.com/ionelmc/pytest-benchmark/pull/257>`_.
* Fixes spelling in some help texts.
  Contributed by Eugeniy in `#267 <https://github.com/ionelmc/pytest-benchmark/pull/267>`_.
* Added new cprofile options:

  - ``--benchmark-cprofile-loops=LOOPS`` - previously profiling only ran the function once, this allow customization.
  - ``--benchmark-cprofile-top=COUNT`` - allows showing more rows.
  - ``--benchmark-cprofile-dump=[FILENAME-PREFIX]`` - allows saving to a file (that you can load in `snakeviz <https://pypi.org/project/snakeviz/>`_, `RunSnakeRun <https://pypi.org/project/RunSnakeRun/>`_ or other tools).
* Removed hidden dependency on `py.path <https://pypi.org/project/py/>`_ (replaced with pathlib).

v4.0.0 (2022-10-26)
-------------------

* Dropped support for legacy Pythons (2.7, 3.6 or older).
* Switched CI to GitHub Actions.
* Removed dependency on the ``py`` library (that was not properly specified as a dependency anyway).
* Fix skipping test in `test_utils.py` if appropriate VCS not available. Also fix typo.
  Contributed by Sam James in `#211 <https://github.com/ionelmc/pytest-benchmark/pull/211>`_.
* Added support for pytest 7.2.0 by using ``pytest.hookimpl`` and ``pytest.hookspec`` to configure hooks.
  Contributed by Florian Bruhin in `#224 <https://github.com/ionelmc/pytest-benchmark/pull/224>`_.
* Now no save is attempted if ``--benchmark-disable`` is used.
  Fixes `#205 <https://github.com/ionelmc/pytest-benchmark/issues/205>`_.
  Contributed by Friedrich Delgado in `#207 <https://github.com/ionelmc/pytest-benchmark/pull/207>`_.

v3.4.1 (2021-04-17)
-------------------

* Republished with updated changelog.

  I intended to publish a ``3.3.0`` release but I messed it up because bumpversion doesn't work well with pre-commit
  apparently... thus ``3.4.0`` was set in by accident.


v3.4.0 (2021-04-17)
-------------------

* Disable progress indication unless ``--benchmark-verbose`` is used.
  Contributed by Dimitris Rozakis in `#149 <https://github.com/ionelmc/pytest-benchmark/pull/149>`_.
* Added Python 3.9, dropped Python 3.5.
  Contributed by Miroslav Šedivý in `#189 <https://github.com/ionelmc/pytest-benchmark/pull/189>`_.
* Changed the "cpu" data in the json output to include everything that cpuinfo outputs, for better or worse as cpuinfo 6.0 changed some
  fields. Users should now ensure they are an adequate cpuinfo package installed.
  **MAY BE BACKWARDS INCOMPATIBLE**
* Changed behavior of ``--benchmark-skip`` and ``--benchmark-only`` to apply early in the collection phase.
  This means skipped tests won't make pytest run fixtures for said tests unnecessarily, but unfortunately this also means
  the skipping behavior will be applied to any tests that requires a "benchmark" fixture, regardless if it would come from pytest-benchmark
  or not.
  **MAY BE BACKWARDS INCOMPATIBLE**
* Added ``--benchmark-quiet`` - option to disable reporting and other information output.
* Squelched unnecessary warning when ``--benchmark-disable`` and save options are used.
  Fixes `#199 <https://github.com/ionelmc/pytest-benchmark/issues/199>`_.
* ``PerformanceRegression`` exception no longer inherits ``pytest.UsageError`` (apparently a *final* class).

v3.2.3 (2020-01-10)
-------------------

* Fixed "already-imported" pytest warning. Contributed by Jonathan Simon Prates in
  `#151 <https://github.com/ionelmc/pytest-benchmark/pull/151>`_.
* Fixed breakage that occurs when benchmark is disabled while using cprofile feature (by disabling cprofile too).
* Dropped Python 3.4 from the test suite and updated test deps.
* Fixed ``pytest_benchmark.utils.clonefunc`` to work on Python 3.8.

v3.2.2 (2017-01-12)
-------------------

* Added support for pytest items without funcargs. Fixes interoperability with other pytest plugins like pytest-flake8.

v3.2.1 (2017-01-10)
-------------------

* Updated changelog entries for 3.2.0. I made the release for pytest-cov on the same day and thought I updated the
  changelogs for both plugins. Alas, I only updated pytest-cov.
* Added missing version constraint change. Now pytest >= 3.8 is required (due to pytest 4.1 support).
* Fixed couple CI/test issues.
* Fixed broken ``pytest_benchmark.__version__``.

v3.2.0 (2017-01-07)
-------------------

* Added support for simple ``trial`` x-axis histogram label. Contributed by Ken Crowell in
  `#95 <https://github.com/ionelmc/pytest-benchmark/pull/95>`_).
* Added support for Pytest 3.3+, Contributed by Julien Nicoulaud in
  `#103 <https://github.com/ionelmc/pytest-benchmark/pull/103>`_.
* Added support for Pytest 4.0. Contributed by Pablo Aguiar in
  `#129 <https://github.com/ionelmc/pytest-benchmark/pull/129>`_ and
  `#130 <https://github.com/ionelmc/pytest-benchmark/pull/130>`_.
* Added support for Pytest 4.1.
* Various formatting, spelling and documentation fixes. Contributed by
  Ken Crowell, Ofek Lev, Matthew Feickert, Jose Eduardo, Anton Lodder, Alexander Duryagin and Grygorii Iermolenko in
  `#97 <https://github.com/ionelmc/pytest-benchmark/pull/97>`_,
  `#105 <https://github.com/ionelmc/pytest-benchmark/pull/105>`_,
  `#110 <https://github.com/ionelmc/pytest-benchmark/pull/110>`_,
  `#111 <https://github.com/ionelmc/pytest-benchmark/pull/111>`_,
  `#115 <https://github.com/ionelmc/pytest-benchmark/pull/115>`_,
  `#123 <https://github.com/ionelmc/pytest-benchmark/pull/123>`_,
  `#131 <https://github.com/ionelmc/pytest-benchmark/pull/131>`_ and
  `#140 <https://github.com/ionelmc/pytest-benchmark/pull/140>`_.
* Fixed broken ``pytest_benchmark_update_machine_info`` hook. Contributed by Alex Ford in
  `#109 <https://github.com/ionelmc/pytest-benchmark/pull/109>`_.
* Fixed bogus xdist warning when using ``--benchmark-disable``. Contributed by Francesco Ballarin in
  `#113 <https://github.com/ionelmc/pytest-benchmark/pull/113>`_.
* Added support for pathlib2. Contributed by Lincoln de Sousa in
  `#114 <https://github.com/ionelmc/pytest-benchmark/pull/114>`_.
* Changed handling so you can use ``--benchmark-skip`` and ``--benchmark-only``, with the later having priority.
  Contributed by Ofek Lev in
  `#116 <https://github.com/ionelmc/pytest-benchmark/pull/116>`_.
* Fixed various CI/testing issues.
  Contributed by Stanislav Levin in
  `#134 <https://github.com/ionelmc/pytest-benchmark/pull/134>`_,
  `#136 <https://github.com/ionelmc/pytest-benchmark/pull/136>`_ and
  `#138 <https://github.com/ionelmc/pytest-benchmark/pull/138>`_.

v3.1.1 (2017-07-26)
-------------------

* Fixed loading data from old json files (missing ``ops`` field, see
  `#81 <https://github.com/ionelmc/pytest-benchmark/issues/81>`_).
* Fixed regression on broken SCM (see
  `#82 <https://github.com/ionelmc/pytest-benchmark/issues/82>`_).

v3.1.0 (2017-07-21)
-------------------

* Added "operations per second" (``ops`` field in ``Stats``) metric --
  shows the call rate of code being tested. Contributed by Alexey Popravka in
  `#78 <https://github.com/ionelmc/pytest-benchmark/pull/78>`_.
* Added a ``time`` field in ``commit_info``. Contributed by "varac" in
  `#71 <https://github.com/ionelmc/pytest-benchmark/pull/71>`_.
* Added a ``author_time`` field in ``commit_info``. Contributed by "varac" in
  `#75   <https://github.com/ionelmc/pytest-benchmark/pull/75>`_.
* Fixed the leaking of credentials by masking the URL printed when storing
  data to elasticsearch.
* Added a ``--benchmark-netrc`` option to use credentials from a netrc file when
  storing data to elasticsearch. Both contributed by Andre Bianchi in
  `#73 <https://github.com/ionelmc/pytest-benchmark/pull/73>`_.
* Fixed docs on hooks. Contributed by Andre Bianchi in `#74 <https://github.com/ionelmc/pytest-benchmark/pull/74>`_.
* Remove ``git`` and ``hg`` as system dependencies when guessing the project name.

3.1.0a2 (2017-03-27)
---------------------

* ``machine_info`` now contains more detailed information about the CPU, in
  particular the exact model. Contributed by Antonio Cuni in `#61 <https://github.com/ionelmc/pytest-benchmark/pull/61>`_.
* Added ``benchmark.extra_info``, which you can use to save arbitrary stuff in
  the JSON. Contributed by Antonio Cuni in the same PR as above.
* Fix support for latest PyGal version (histograms). Contributed by Swen Kooij in
  `#68 <https://github.com/ionelmc/pytest-benchmark/pull/68>`_.
* Added support for getting ``commit_info`` when not running in the root of the repository. Contributed by Vara Canero in
  `#69 <https://github.com/ionelmc/pytest-benchmark/pull/69>`_.
* Added short form for ``--storage``/``--verbose`` options in CLI.
* Added an alternate ``pytest-benchmark`` CLI bin (in addition to ``py.test-benchmark``) to match the madness in pytest.
* Fix some issues with ``--help`` in CLI.
* Improved git remote parsing (for ``commit_info`` in JSON outputs).
* Fixed default value for ``--benchmark-columns``.
* Fixed comparison mode (loading was done too late).
* Remove the project name from the autosave name. This will get the old brief naming from 3.0 back.

3.1.0a1 (2016-10-29)
---------------------

* Added ``--benchmark-columns`` command line option. It selects what columns are displayed in the result table. Contributed by
  Antonio Cuni in `#34 <https://github.com/ionelmc/pytest-benchmark/pull/34>`_.
* Added support for grouping by specific test parametrization (``--benchmark-group-by=param:NAME`` where ``NAME`` is your
  param name). Contributed by Antonio Cuni in `#37 <https://github.com/ionelmc/pytest-benchmark/pull/37>`__.
* Added support for ``name`` or ``fullname`` in ``--benchmark-sort``.
  Contributed by Antonio Cuni in `#37 <https://github.com/ionelmc/pytest-benchmark/pull/37>`_.
* Changed signature for ``pytest_benchmark_generate_json`` hook to take 2 new arguments: ``machine_info`` and ``commit_info``.
* Changed ``--benchmark-histogram`` to plot groups instead of name-matching runs.
* Changed ``--benchmark-histogram`` to plot exactly what you compared against. Now it's ``1:1`` with the compare feature.
* Changed ``--benchmark-compare`` to allow globs. You can compare against all the previous runs now.
* Changed ``--benchmark-group-by`` to allow multiple values separated by comma.
  Example: ``--benchmark-group-by=param:foo,param:bar``
* Added a command line tool to compare previous data: ``py.test-benchmark``. It has two commands:

  * ``list`` - Lists all the available files.
  * ``compare`` - Displays result tables. Takes options:

    * ``--sort=COL``
    * ``--group-by=LABEL``
    * ``--columns=LABELS``
    * ``--histogram=[FILENAME-PREFIX]``
* Added ``--benchmark-cprofile`` that profiles last run of benchmarked function.  Contributed by Petr Šebek.
* Changed ``--benchmark-storage`` so it now allows elasticsearch storage. It allows to store data to elasticsearch instead to
  json files. Contributed by Petr Šebek in `#58 <https://github.com/ionelmc/pytest-benchmark/pull/58>`_.

v3.0.0 (2015-11-08)
-------------------

* Improved ``--help`` text for ``--benchmark-histogram``, ``--benchmark-save`` and ``--benchmark-autosave``.
* Benchmarks that raised exceptions during test now have special highlighting in result table (red background).
* Benchmarks that raised exceptions are not included in the saved data anymore (you can still get the old behavior back
  by implementing ``pytest_benchmark_generate_json`` in your ``conftest.py``).
* The plugin will use pytest's warning system for warnings. There are 2 categories: ``WBENCHMARK-C`` (compare mode
  issues) and ``WBENCHMARK-U`` (usage issues).
* The red warnings are only shown if ``--benchmark-verbose`` is used. They still will be always be shown in the
  pytest-warnings section.
* Using the benchmark fixture more than one time is disallowed (will raise exception).
* Not using the benchmark fixture (but requiring it) will issue a warning (``WBENCHMARK-U1``).

3.0.0rc1 (2015-10-25)
----------------------

* Changed ``--benchmark-warmup`` to take optional value and automatically activate on PyPy (default value is ``auto``).
  **MAY BE BACKWARDS INCOMPATIBLE**
* Removed the version check in compare mode (previously there was a warning if current version is lower than what's in
  the file).

3.0.0b3 (2015-10-22)
----------------------

* Changed how comparison is displayed in the result table. Now previous runs are shown as normal runs and names get a
  special suffix indicating the origin. Eg: "test_foobar (NOW)" or "test_foobar (0123)".
* Fixed sorting in the result table. Now rows are sorted by the sort column, and then by name.
* Show the plugin version in the header section.
* Moved the display of default options in the header section.

3.0.0b2 (2015-10-17)
----------------------

* Add a ``--benchmark-disable`` option. It's automatically activated when xdist is on
* When xdist is on or ``statistics`` can't be imported then ``--benchmark-disable`` is automatically activated (instead
  of ``--benchmark-skip``). **BACKWARDS INCOMPATIBLE**
* Replace the deprecated ``__multicall__`` with the new hookwrapper system.
* Improved description for ``--benchmark-max-time``.

3.0.0b1 (2015-10-13)
---------------------

* Tests are sorted alphabetically in the results table.
* Failing to import ``statistics`` doesn't create hard failures anymore. Benchmarks are automatically skipped if import
  failure occurs. This would happen on Python 3.2 (or earlier Python 3).

3.0.0a4 (2015-10-08)
---------------------

* Changed how failures to get commit info are handled: now they are soft failures. Previously it made the whole
  test suite fail, just because you didn't have ``git/hg`` installed.

3.0.0a3 (2015-10-02)
---------------------

* Added progress indication when computing stats.

3.0.0a2 (2015-09-30)
---------------------

* Fixed accidental output capturing caused by capturemanager misuse.

3.0.0a1 (2015-09-13)
---------------------

* Added JSON report saving (the ``--benchmark-json`` command line arguments). Based on initial work from Dave Collins in
  `#8 <https://github.com/ionelmc/pytest-benchmark/pull/8>`_.
* Added benchmark data storage(the ``--benchmark-save`` and ``--benchmark-autosave`` command line arguments).
* Added comparison to previous runs (the ``--benchmark-compare`` command line argument).
* Added performance regression checks (the ``--benchmark-compare-fail`` command line argument).
* Added possibility to group by various parts of test name (the ``--benchmark-compare-group-by`` command line argument).
* Added historical plotting (the ``--benchmark-histogram`` command line argument).
* Added option to fine tune the calibration (the ``--benchmark-calibration-precision`` command line argument and
  ``calibration_precision`` marker option).

* Changed ``benchmark_weave`` to no longer be a context manager. Cleanup is performed automatically.
  **BACKWARDS INCOMPATIBLE**
* Added ``benchmark.weave`` method (alternative to ``benchmark_weave`` fixture).

* Added new hooks to allow customization:

  * ``pytest_benchmark_generate_machine_info(config)``
  * ``pytest_benchmark_update_machine_info(config, info)``
  * ``pytest_benchmark_generate_commit_info(config)``
  * ``pytest_benchmark_update_commit_info(config, info)``
  * ``pytest_benchmark_group_stats(config, benchmarks, group_by)``
  * ``pytest_benchmark_generate_json(config, benchmarks, include_data)``
  * ``pytest_benchmark_update_json(config, benchmarks, output_json)``
  * ``pytest_benchmark_compare_machine_info(config, benchmarksession, machine_info, compared_benchmark)``

* Changed the timing code to:

  * Tracers are automatically disabled when running the test function (like coverage tracers).
  * Fixed an issue with calibration code getting stuck.

* Added ``pedantic mode`` via ``benchmark.pedantic()``. This mode disables calibration and allows a setup function.


v2.5.0 (2015-06-20)
-------------------

* Improved test suite a bit (not using ``cram`` anymore).
* Improved help text on the ``--benchmark-warmup`` option.
* Made ``warmup_iterations`` available as a marker argument (eg: ``@pytest.mark.benchmark(warmup_iterations=1234)``).
* Fixed ``--benchmark-verbose``'s printouts to work properly with output capturing.
* Changed how warmup iterations are computed (now number of total iterations is used, instead of just the rounds).
* Fixed a bug where calibration would run forever.
* Disabled red/green coloring (it was kinda random) when there's a single test in the results table.

v2.4.1 (2015-03-16)
-------------------

* Fix regression, plugin was raising ``ValueError: no option named 'dist'`` when xdist wasn't installed.

v2.4.0 (2015-03-12)
-------------------

* Add a ``benchmark_weave`` experimental fixture.
* Fix internal failures when ``xdist`` plugin is active.
* Automatically disable benchmarks if ``xdist`` is active.

v2.3.0 (2014-12-27)
-------------------

* Moved the warmup in the calibration phase. Solves issues with benchmarking on PyPy.

  Added a ``--benchmark-warmup-iterations`` option to fine-tune that.

v2.2.0 (2014-12-26)
-------------------

* Make the default rounds smaller (so that variance is more accurate).
* Show the defaults in the ``--help`` section.

v2.1.0 (2014-12-20)
-------------------

* Simplify the calibration code so that the round is smaller.
* Add diagnostic output for calibration code (``--benchmark-verbose``).

v2.0.0 (2014-12-19)
-------------------

* Replace the context-manager based API with a simple callback interface. **BACKWARDS INCOMPATIBLE**
* Implement timer calibration for precise measurements.

v1.0.0 (2014-12-15)
-------------------

* Use a precise default timer for PyPy.

v0.0.1 - v0.12.1 (2014-10-09 - 2014-12-15)
------------------------------------------

* README and styling fixes. Contributed by Marc Abramowitz in `#4 <https://github.com/ionelmc/pytest-benchmark/pull/4>`_.
* Lots of wild changes and too many irrelevant releases to include.