Performance analysis for Python.
tuna is a modern, lightweight Python profile viewer inspired by SnakeViz. It handles runtime and import profiles, has minimal dependencies, uses d3 and bootstrap, and avoids certain errors present in SnakeViz (see below) and is faster, too.
Create a runtime profile with
python -mcProfile -o program.prof yourfile.py
or an import profile with
python -X importtime yourfile.py 2> import.log
and show it with
tuna program.prof
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):
c(t0)
d(t1)
def b():
a(1, 4)
def c(t):
time.sleep(t)
def d(t):
time.sleep(t)
if __name__ == "__main__":
a(4, 1)
b()
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. SnakeViz, on the other hand, tries to construct the entire call tree, but ends up providing lots of wrong timings.
 |
 |
|---|---|
| SnakeViz output. Wrong. | tuna output. Only shows what can be retrieved from the profile. |
Installation
tuna is available from the Python Package Index, so simply do
pip install tuna
to install.
IPython magics
tuna includes a tuna line / cell magic which can be used as a drop-in replacement for
the prun magic. Simply run %load_ext tuna to load the magic and then call it like
%tuna sleep(3) or
%%tuna
sleep(3)
prun is still used to do the actual profiling and then the results are displayed in
the notebook.
Development
After forking and cloning the repository, make sure to run just dep to install
additional dependencies (bootstrap and d3) which aren't stored in the repo.
License
This software is published under the GPLv3 license.
1 maintainer
Release files for tuna 0.5.15
For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.
Source distribution (sdist)
| File | Size | Uploaded | |
|---|---|---|---|
| tuna-0.5.15.tar.gz | 162.4 kB | Details |
Built distribution (wheel)
| File | Interpreter | ABI | Platform | Reset |
|---|---|---|---|---|
| tuna-0.5.15-py3-none-any.whl | Python 3 | none | any | Details |
Total release size:322.9 kB
Release files / tuna-0.5.15.tar.gz
| Download URL | tuna-0.5.15.tar.gz |
|---|---|
| Size | 162.4 kB |
| Tags | Source |
|
SHA-256 checksum How to use checksums |
0109ab102374ecf5d47f950267b516b6009c3cf48e8caba3b2c859ed3f6fb996
|
|
BLAKE2b-256 checksum How to use checksums |
cf792321629fc8838b07ca0b2851a8e4ebf99d4a36c2d3fecd3dc391c9dba9a9
|
| Upload date | |
|
Uploaded using Trusted Publishing? What is trusted publishing? |
Yes |
| Uploaded via |
twine/6.1.0 CPython/3.13.12
|
Provenance
Provenance describes where a file came from. On PyPI, provenance is shared via attestations, which provide a verifiable record of the build or publishing details. View details, limitations and caveats.
PyPI Publish Attestation
PyPI verified that this artifact, at this checksum, originated from the publisher listed below.
Signed by GitHub Actions, verified by PyPI on May 19, 2026.
Transparency logRelease files / tuna-0.5.15-py3-none-any.whl
| Download URL | tuna-0.5.15-py3-none-any.whl |
|---|---|
| Size | 160.5 kB |
| Tags | Python 3 |
|
SHA-256 checksum How to use checksums |
889a62552067133e86851cebb1042bfc28242141ea80d4ae9c64142d86e060a3
|
|
BLAKE2b-256 checksum How to use checksums |
a6c7622f828d2d6e73826f46d7589f1d3be9812cef5827076040c9fa06b80f7e
|
| Upload date | |
|
Uploaded using Trusted Publishing? What is trusted publishing? |
Yes |
| Uploaded via |
twine/6.1.0 CPython/3.13.12
|
Provenance
Provenance describes where a file came from. On PyPI, provenance is shared via attestations, which provide a verifiable record of the build or publishing details. View details, limitations and caveats.
PyPI Publish Attestation
PyPI verified that this artifact, at this checksum, originated from the publisher listed below.
Signed by GitHub Actions, verified by PyPI on May 19, 2026.
Transparency log
