Skip to main content
This is a pre-production deployment of Warehouse. Changes made here affect the production instance of PyPI (
Help us improve Python packaging - Donate today!

Statistical profiler which outputs in format suitable for FlameGraph

Project Description

A simple statistical profiler which outputs in format suitable for FlameGraph.


Simply run:

pip install git+


Run your script under the profiler:

python -m flamegraph -o perf.log --your-script args here

Run Brendan Gregg’s FlameGraph tool against the output: --title "MyScript CPU" perf.log > perf.svg

Enjoy the output:


Sometimes you may want to exclude a method (for example in a server the method that waits for a new request) or you may want to profile only a subset of your code (a particular method and its children which are performance critical).

Filtering can be done by passing a python regular expression to the -f or --filter command line option which will restrict output to only those lines which match. Filtering is done against the entire line so you can filter by function name, thread name, both, or even by more complex filters such as function ABC calls DEF (ABC.*DEF).

Alternatively since the output is stackframes each on a line by itself, this can simply be done with a simple grep filter.:


  grep -v waiting_method perf.log > removed_waiting.log


  grep function_name perf.log > filtered.log

Then run the script against the filtered file.

Full profile output of yCanta webapp PDF export. Most time is spent in wait state and graph is not very helpful.

Filtered profile output of yCanta webapp PDF export. Filtering was on the pdf format function so time spent in wait state has been excluded and the graph is now helpful.

Release History

This version
History Node


Download Files

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

File Name & Hash SHA256 Hash Help Version File Type Upload Date
(4.0 kB) Copy SHA256 Hash SHA256
Source Apr 21, 2016

Supported By

WebFaction WebFaction Technical Writing Elastic Elastic Search Pingdom Pingdom Monitoring Dyn Dyn DNS Sentry Sentry Error Logging CloudAMQP CloudAMQP RabbitMQ Heroku Heroku PaaS Kabu Creative Kabu Creative UX & Design Fastly Fastly CDN DigiCert DigiCert EV Certificate Rackspace Rackspace Cloud Servers DreamHost DreamHost Log Hosting