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Visualize Python profiles in the browser

Project description


Performance analysis for Python.

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tuna is a modern, lightweight Python profile viewer inspired by SnakeViz. It handles runtime and import profiles, has no Python dependencies, uses d3 and bootstrap, and avoids certain errors present in SnakeViz.

Create a runtime profile with

python -mcProfile -o

or an import profile with

python -X importtime 2> import.log

and show it with


Why tuna doesn't show the whole call tree

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

pip3 install tuna --user --upgrade

to install or upgrade.


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



tuna is published under the MIT license.

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Files for tuna, version 0.3.5
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