Skip to main content

Visualize Python profiles in the browser

Project description


CircleCI Code style: black PyPi Version GitHub stars

tuna is a Python profile viewer inspired by the amazing SnakeViz.

Create a runtime profile with

python -mcProfile -o

or an import profile with

python -X importprofile 2> import.log

and show it with


But tuna doesn't show the whole call tree!

Right, and that's because the whole timed call tree cannot be retrieved from profile data. Python developers made the decision to only store parent data in profiles because it can be computed with little overhead. To illustrate, consider the following program.

import time

def a(t0, t1):

def b():
    return a(1, 4)

def c(t):

def d(t):

if __name__ == "__main__":
    a(4, 1)

The root process (__main__) calls a() which spends 4 seconds in c() and 1 second in d(). __main__ also calls b() which calls a(), this time spending 1 second in c() and 4 seconds in d(). The profile, however, will only store that c() spent a total of 5 seconds when called from a(), and likewise d(). The information that the program spent more time in c() when called in root -> a() -> c() than when called in root -> b() -> a() -> c() is not present in the profile.

tuna only displays the part of the timed call tree that can be deduced from the profile:


tuna is available from the Python Package Index, so simply type

pip install -U tuna

to install or upgrade.


To run the tuna unit tests, check out this repository and type



To create a new release

  1. bump the __version__ number,

  2. tag and upload to PyPi:

    make publish


tuna is published under the MIT license.

Project details

Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Filename, size & hash SHA256 hash help File type Python version Upload date
tuna-0.2.0-py2.py3-none-any.whl (118.0 kB) Copy SHA256 hash SHA256 Wheel py2.py3
tuna-0.2.0.tar.gz (117.4 kB) Copy SHA256 hash SHA256 Source None

Supported by

Elastic Elastic Search Pingdom Pingdom Monitoring Google Google BigQuery Sentry Sentry Error logging AWS AWS Cloud computing DataDog DataDog Monitoring Fastly Fastly CDN SignalFx SignalFx Supporter DigiCert DigiCert EV certificate StatusPage StatusPage Status page