pyinstrument

Documentation

Pyinstrument is a Python profiler. A profiler is a tool to help you optimize your code - make it faster. To get the biggest speed increase you should focus on the slowest part of your program. Pyinstrument helps you find it!

☕️ Not sure where to start? Check out this video tutorial from calmcode.io!

Installation

pip install pyinstrument

Pyinstrument supports Python 3.8+.

To run Pyinstrument from a git checkout, there's a build step. Take a look at Contributing for more info.

Documentation

To learn how to use pyinstrument, or to check the reference, head to the documentation.

Known issues

Profiling code inside a Docker container can cause some strange results, because the gettimeofday syscall that pyinstrument uses is slow in that environment. See #83
When using pyinstrument script.py where script.py contains a class serialized with pickle, you might encounter errors because the serialisation machinery doesn't know where __main__ is. See this issue for workarounds

Changelog

v5.1.3

Fixed Django middleware so PYINSTRUMENT_SHOW_CALLBACK is respected when PYINSTRUMENT_PROFILE_DIR is configured, allowing profiles to be selectively written to disk (#452).
Fixed Jupyter’s %%pyinstrument magic so console-specific render options—including time=percent_of_total, flat, short_mode, color, and Unicode settings—are correctly applied to text output (#446).
Fixed long program and command names overflowing the header in HTML reports. Long names now wrap cleanly (#449).
Added context-manager type annotations so type checkers correctly infer profile as a Profiler in with Profiler() as profile: blocks (#445).
Expanded wheel-building coverage to include CPython prereleases and GraalPy (#442).
Replaced the deprecated vendored appdirs implementation with simpler internal platform-specific user-data-directory handling (#451).
Updated build tooling and dependencies, including cibuildwheel and GitHub Actions.

v5.1.2

4 January 2026

Adds the ability to customize description using CLI option --target-description (#408)
You can set the interval for the Django middleware using the PYINSTRUMENT_INTERVAL option (#416)
HTMLRenderer can now run preprocessors on the input, to manipulate the call tree before writing to HTML (#403)
Fix a bug where mismatched start/stops can produce "call stack without an active session" errors (#406)
Limit sample count for the HTML renderer to ensure the browser can load the sample (#407)

v5.1.1

12 August 2025

Fix some memory leaks in the low-level C extension (#394)

v5.1.0

10 August 2025

Precision of printed durations now adapts to the interval of the profile. This allows you to see more detail when the interval, and hides unnecessary detail when the interval is large. (#390)
Adds an option to the Django middleware to customise the filename of saved profile runs using a callback (#393)
Adds an aiohttp.web example to the documentation (#389)

v5.0.3

2 July 2025

Fix a bug where the HTML renderer would crash when the profile is empty (#377)

v5.0.2

24 May 2025

Fix a bug that caused jupyter notebooks to continue to run after a profiled cell was interrupted with Ctrl-C (#373)
Fix a type annotation issue when using mypy and import pyinstrument (#373)

v5.0.1

23 January 2025

Adds a Django option to customise the filename of saved profile runs (#339)
Improve the FastAPI integration docs (#355)
Include more options in the IPython magic (#350)

v5.0.0

11 October 2024

Loads of improvements to the HTML renderer!

Timeline mode - see and zoom into an interactive linear timeline!
HTML mode now has interactive options, rather than needing to set the upfront.
Streamlined the design of the HTML page header.
HTML Call stack view supports arrow key navigation.
The way ‘library’ code is detected has been changed. Previously, if the string ‘/lib/’ occurred in the file path, that was considered library code (and collapsed by default). Now, pyinstrument captures the paths of the Python install and any active virtualenv/conda env at profile time. Files that are stored there are considered library. That should give fewer false positives.
Calls to profiler.start() can now pass a target_description parameter, which is displayed in the profile readout.

Check my blog post for more info on the new features.

v4.7.3

6 September 2024

Fix a bug introduced in 4.7.0 which would cause the profiler to crash when profiling code with unusual locals, notably some pytest extensions (#332)
Fix a bug that causes pyinstrument to fail to import packages like glom on Python 3.12 or later, which mutate the locals() dict. (#336)
Fix a bug that caused a UnicodeDecodeError on some platforms (#330)
Fix a DivideByZero error that occurs in some situations
The IPython integration takes greater step to ensure a clean profile output, by ensuring internal frames are trimmed before printing. (#321)

v4.7.2

5 August 2024

Add CPython 3.13 wheels
Fix a bug that caused the HTML output to fail to render in some browser contexts (#328)

v4.7.1

2 August 2024

Fix issue with PyPI upload

v4.7.0

1 August 2024

Adds a new, convenient API for profiling chunks of Python code! You can now profile simply using a with block, or a function/method decorator. This will profile the code and print a short readout into the terminal. (#327)
Adds new, lower overhead timing options. Pyinstrument calls timers on every Python function call, which is fine on systems with fast timing available, but it adds significant overhead on systems that require a syscall for each, such as some Docker environments. Pyinstrument will now detect slow timers present a warning with two choices. You can enable a 'timing thread', which offloads the timing workload from the profiled thread, or, if you're happy with lower resolution, you can opt to use a 'coarse' timer, which is provided on some Linux systems. (#273)
Alt-click rows in the HTML output to collapse/expand the whole tree (#325)
Adds a flat argument to the console output, to present a flat list of functions (#294)
Adds a Litestar example config and docs (#284)
Preliminary Python 3.13 support (#322)

v4.6.2

26 January 2024

Fixes a bug with the pstats renderer, where additional frames could be seen in the output. (#287)
Adds show_all option to Profiler.output_html

v4.6.1

8 November 2023

Fixes a bug with unwanted variable expansion in the IPython magics %pyinstrument (#278)

v4.6.0

12 October 2023

Adds a feature -c, which allows profiling code directly from the command line, like python -c. (#271)
Adds a convenience method Profiler.write_html, for writing HTML output to a file directly. (#266)

v4.5.3

7 September 2023

Fix a problem in the packaging process that prevented upload to PyPI

v4.5.2

1 September 2023

Show the program name in the header of the HTML output (#260)
Improve program name capture through resilience to other programs modifying sys.argv (#258)
Add support for Python 3.12 (#246)

v4.5.1

22 July 2023

Fix a bug that caused [X frames hidden] in the output when frames were deleted due to __tracebackhide__ (#255)
Fix a bug causing built-in code to display the filepath None in the console output (#254)
Some docs improvements (#251)

v4.5.0

5 June 2023

Adds a flat mode to the console renderer, which can be enabled by passing -p flat on the command line. This mode shows the heaviest frame as measured by self-time, which can be useful in some codebases. (#240)
Adds the ability to save pstats files. This is the file format used by cprofile in the stdlib. It's less detailed than pyinstrument profiles, but it's compatible with more tools. (#236)
Fixes a detail of the --show-all option - pyinstrument will no longer remove Python-internal frames when this option is supplied. (#239)
Internally to the HTML renderer, it now uses Svelte to render the frontend, meaning profile HTML files bundle less javascript and so are smaller. (#222)

v4.4.0

5 November 2022

Adds the class name to methods in the console & HTML outputs (#203)
Fix a bug that caused pyinstrument machinery to appear at the start of a profile (#215)
Frames that set a __traceback_hide__ local variable will now be removed from the output (#217)
Jupyter/IPython magic now supports async/await, if you run with a --async_mode=enabled flag. (#212)
Fix a crash when more than one root frame is captured in a thread - this can happen with gevent.
A big refactor to the backend, allowing more than just static information to be captured. This currently is just powering the class name feature, but more is to come!

v4.3.0

21 August 2022

Adds buttons in the HTML output to switch between absolute and proportional (percentage) time.
Adds a command line flag --interval (seconds, default 0.001) to change the interval that pyinstrument samples a program. This is useful for long-running programs, where increasing the interval reduces the memory overhead.
Includes wheels for CPython 3.11.

v4.2.0

Adds a command-line option -p --render-option that allows arbitrary setting of render options. This lets you set options like filter_threshold from the command line, by doing something like pyinstrument -p processor_options.filter_threshold=0.

Here's the help output for the option:

  -p RENDER_OPTION, --render-option=RENDER_OPTION
                    options to pass to the renderer, in the format
                    'flag_name' or 'option_name=option_value'. For
                    example, to set the option 'time', pass '-p
                    time=percent_of_total'. To pass multiple options, use
                    the -p option multiple times. You can set processor
                    options using dot-syntax, like '-p
                    processor_options.filter_threshold=0'. option_value is
                    parsed as a JSON value or a string.

Adds the ability to view times in the console output as percentages, rather than absolute times. Use the ConsoleRenderer option time='percent_of_total', or on the command line, use -p, like pyinstrument -p time=percent_of_total.
Adds command line options for loading and saving pyinstrument sessions. You can save the raw data for a pyinstrument session with -r session, like pyinstrument -r session -o session.pyisession myscript.py. Loading is via --load, e.g. pyinstrument --load session.pyisession.
Command line output format is inferred from the -o output file extension. So if you do pyinstrument -o profile.html myscript.py, you don't need to supply -r html, pyinstrument will automatically use the HTML renderer. Or if you do pyinstrument -o profile.pyisession myscript.py, it will save a raw session object.
Adds usage examples for FastAPI and pytest to the documentation.
Fixes a bug causing NotImplementedError when using async_mode=strict.
Adds support for Python 3.11

v4.1.1

Fixed an issue causing PYINSTRUMENT_PROFILE_DIR_RENDERER to output the wrong file extension when used with the speedscope renderer.

v4.1.0

You can now use pyinstrument natively in an IPython notebook! Just use %load_ext pyinstrument at the top of your notebook, and then %%pyinstrument in the cell you want to profile.
Added support for the speedscope format. This provides a way to view interactive flamecharts using pyinstrument. To use, profile with pyinstrument -r speedscope, and upload to the speedscope web app.
You can now configure renderers for the Django middleware file output, using the PYINSTRUMENT_PROFILE_DIR_RENDERER option.
Added wheels for Linux aarch64 (64-bit ARM).

v4.0.4

Fix a packaging issue where a package called 'test' was installed alongside pyinstrument
Use more modern C APIs to resolve deprecation warnings on Python 3.10.
Minor docs fixes

v4.0.3

CPython 3.10 support
Improve error messages when trying to use Profiler from multiple threads
Fix crash when rendering sessions that contain a module in a FrameGroup

v4.0.2

Fix some packaging issues

v4.0.0

Async support! Pyinstrument now detects when an async task hits an await, and tracks time spent outside of the async context under this await.

So, for example, here's a simple script with an async task that does a sleep:

import asyncio
from pyinstrument import Profiler

async def main():
    p = Profiler(async_mode='disabled')

    with p:
        print('Hello ...')
        await asyncio.sleep(1)
        print('... World!')

    p.print()

asyncio.run(main())

Before Pyinstrument 4.0.0, we'd see only time spent in the run loop, like this:

  _     ._   __/__   _ _  _  _ _/_   Recorded: 18:33:03  Samples:  2
 /_//_/// /_\ / //_// / //_'/ //     Duration: 1.006     CPU time: 0.001
/   _/                      v3.4.2

Program: examples/async_example_simple.py

1.006 _run_once  asyncio/base_events.py:1784
└─ 1.005 select  selectors.py:553
      [3 frames hidden]  selectors, <built-in>
         1.005 kqueue.control  <built-in>:0

Now, with pyinstrument 4.0.0, we get:

  _     ._   __/__   _ _  _  _ _/_   Recorded: 18:30:43  Samples:  2
 /_//_/// /_\ / //_// / //_'/ //     Duration: 1.007     CPU time: 0.001
/   _/                      v4.0.0

Program: examples/async_example_simple.py

1.006 main  async_example_simple.py:4
└─ 1.005 sleep  asyncio/tasks.py:641
      [2 frames hidden]  asyncio
         1.005 [await]

For more information, check out the async profiling documentation and the Profiler.async_mode property.

Pyinstrument has a documentation site, including full Python API docs!

v3.4.2

Fix a bug that caused --show, --show-regex, --show-all to be ignored on the command line.

v3.4.1

Under-the-hood modernisation

v3.4.0

Added timeline option (boolean) to Profiler methods output_html() and open_in_browser().

v3.3.0

Fixed issue with pyinstrument -m module, where pyinstrument wouldn't find modules in the current directory.
Dropped support for Python 2.7 and 3.5. Old versions will remain available on PyPI, and pip should choose the correct one automatically.

v3.2.0

Added the ability to track time in C functions. Minor note - Pyinstrument will record time spent C functions as 'leaf' functions, due to a limitation in how Python records frames. Python -> C -> Python is recorded as Python -> Python, but Python -> Python -> C will be attributed correctly. (#103)

v3.1.2

Fix <__array_function__ internals> frames appearing as app code in reports

v3.1.1

Added support for timeline mode on HTML and JSON renderers
Released as a tarball as well as a universal wheel

v3.1.0

Added PYINSTRUMENT_SHOW_CALLBACK option on the Django middleware to add a condition to showing the profile (could be used to run pyinstrument on a live server!)
Fixed bug in the Django middleware where file would not be written because of a unicode error

v3.0.3

Fixed bug with the Django middleware on Windows where profiling would fail because we were trying to put an illegal character '?' in the profile path. (#66)

v3.0.2

Add --show and --show-regex options, to mark certain files to be displayed. This helps to profile inside specific modules, while hiding others. For example, pyinstrument --show '*/sympy/*' script.py.

v3.0.1

Fix #60: pass all arguments after -m module_name to the called module
Fix crash during HTML/JSON output when no frames were captured.

v3.0.0

Pyinstrument will now hide traces through libraries that you're using by default. So instead of showing you loads of frames going through the internals of something external e.g. urllib, it lets you focus on your code.

Before After

To go back to the old behaviour, use --show-all on the command line.
'Entry' frames of hidden groups are shown, so you know which call is the problem
Really slow frames in the groups are shown too, e.g. the 'read' call on the socket
Application code is highlighted in the console
Additional metrics are shown at the top of the trace - timestamp, number of samples, duration, CPU time

Hidden code is controlled by the --hide or --hide-regex options - matching on the path of the code files.

  --hide=EXPR           glob-style pattern matching the file paths whose
                        frames to hide. Defaults to '*/lib/*'.
  --hide-regex=REGEX    regex matching the file paths whose frames to hide.
                        Useful if --hide doesn't give enough control.

Outputting a timeline is supported from the command line.

  -t, --timeline        render as a timeline - preserve ordering and don't
                        condense repeated calls

Because there are a few rendering options now, you can load a previous profiling session using --load-prev - pyinstrument keeps the last 10 sessions.
Hidden groups can also call back into application code, that looks like this:
(internal) When recording timelines, frame trees are completely linear now, allowing for the creation of super-accurate frame charts.
(internal) The HTML renderer has been rewritten as a Vue.js app. All the console improvements apply to the HTML output too, plus it's interactive.
(internal) A lot of unit and integration tests added!

Yikes! See #49 for the gory details. I hope you like it.

v2.3.0

Big refactor!
- Recorders have been removed. The frame recording is now internal to the Profiler object. This means the 'frame' objects are more general-purpose, which paves the way for...
- Processors! These are functions that mutate the tree to sculpt the output. They are used by the renderers to filter the output to the correct form. Now, instead of a time-aggregating recorder, the profiler just uses timeline-style recording (this is lower-overhead anyway) and the aggregation is done as a processing step.
- The upshot of this is that it's now way easier to alter the tree to filter stuff out, and do more advanced things like combining frames that we don't care about. More features to come that use this in v3.0!
Importlib frames are removed - you won't see them at all. Their children are retained, so imports are just transparent.
Django profile file name is now limited to a hundred of characters (#50)
Fix bug with --html option (#53)
Add --version command line option

v2.2.1

Fix crash when using on the command line.

v2.2.0

Added support for JSON output. Use pyinstrument --renderer=json scriptfile.py. PR
@iddan has put together an interactive viewer using the JSON output!
When running pyinstrument --html and you don't pipe the output to a file, pyinstrument will write the console output to a temp file and open that in a browser.

v2.1.0

Added support for running modules with pyinstrument via the command line. The new syntax is the -m flag e.g. pyinstrument -m module_name! PR

v2.0.4

Fix crashes due to multi-threaded use of pyinstrument. The fix is in the C extension, over at https://github.com/joerick/pyinstrument_cext/pull/3

v2.0.3

Pyinstrument can now be used in a with block.

For example:

profiler = pyinstrument.Profiler()
with profiler:
    # do some work here...
print(profiler.output_text())

Middleware fix for older versions of Django

v2.0.2

Fix for max recursion error when used to profile programs with a lot of frames on the stack.

v2.0.1

Ensure license is included in the sdist.

v2.0.0

Pyinstrument uses a new profiling mode. Rather than using signals, pyintrument uses a new statistical profiler built on PyEval_SetProfile. This means no more main thread restriction, no more IO errors when using Pyinstrument, and no need for a separate more 'setprofile' mode!
Renderers. Users can customize Pyinstrument to use alternative renderers with the renderer argument on Profiler.output(), or using the --renderer argument on the command line.
Recorders. To support other use cases of Pyinstrument (e.g. flame charts), pyinstrument now has a 'timeline' recorder mode. This mode records captured frames in a linear way, so the program execution can be viewed on a timeline.

v0.13

pyinstrument command. You can now profile python scripts from the shell by running $ pyinstrument script.py. This is now equivalent to python -m pyinstrument. Thanks @asmeurer!

v0.12

Application code is highlighted in HTML traces to make it easier to spot
Added PYINSTRUMENT_PROFILE_DIR option to the Django interface, which will log profiles of all requests to a file the specified folder. Useful for profiling API calls.
Added PYINSTRUMENT_USE_SIGNAL option to the Django interface, for use when signal mode presents problems.

Contributing

To setup a dev environment:

virtualenv --python=python3 env
. env/bin/activate
pip install --upgrade pip
pip install -r requirements-dev.txt
prek install --install-hooks

To get some sample output:

pyinstrument examples/demo_scripts/wikipedia_article_word_count.py

To run the tests:

pytest

To run linting checks locally:

prek run --all-files

Some of the checks, like isort or black, will auto-fix the problems they find. So if the above command returns an error, try running it again, it might succeed the second time :)

Running all the checks can be slow, so you can also run checks individually, e.g., to format source code that fails isort or black checks:

prek run --all-files isort
prek run --all-files black

To diagnose why pyright checks are failing:

prek run --all-files pyright

The HTML renderer Vue.js app

The HTML renderer works by embedding a JSON representation of the sample with a Javascript 'bundle' inside an HTML file that can be viewed in any web browser.

To edit the html renderer style, do:

cd html_renderer
npm ci
npm run serve

When launched without a top-level window.profileSession object, it will fetch a sample profile so you can work with it.

To compile the JS app and bundle it back into the pyinstrument python tool:

bin/build_js_bundle.py [--force]

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pyinstrument 5.1.3

pyinstrument

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