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A timer for the phases of Pytest's execution.

Project description


A plugin to use with Pytest to measure execution time of tests.

Distinctly different from the --durations option of pytest, this plugin measures specific pytest startup/collection phases.

Leverages pytest hooks to measure execution time of phases.



  • Python 3.7 or later.
  • Pytest 6.2 or later.

Install the plugin with any approach for your project.

Some examples:

pip install pytest-execution-timer
poetry add --dev pytest-execution-timer
pipenv install --dev pytest-execution-timer

Or add it to your requirements.txt file.


Enable the plugin with the --execution-timer option when running pytest:

$ pytest --execution-timer
Durations of pytest phases in seconds (min 100ms):
0.662	pytest_runtestloop

Control the threshold (default 100ms) by passing --minimum-duration=<value in ms>:

$ pytest --execution-timer --minimum-duration=1000  # 1 second

Understanding the output

The best ay to start is to compare the difference of the pytest_runtestloop duration and the overall duration of the test run. Example:

Durations of pytest phases in seconds (min 100ms):
0.666	pytest_runtestloop
====== 4 passed in 0.68s ======

In this example, there's not much lost between the test run and the pytest_runtestloop meaning that the startup and collection phases are not taking too much time.

If there's a larger difference in the timings, look to other emitted phases to understand what's taking the most time.

These can then be examined directly, or use other tools like profilers or import timings.


Distributed under the terms of the MIT license, "pytest-execution-timer" is free and open source software. See LICENSE for more information.

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