Bitbucket is a code hosting site with unlimited public and private repositories. We're also free for small teams!



Build Status


CPython standard distribution is coming with three profilers. cProfile, Profile and hotshot. cProfile module is implemented as a C module based on lsprof, Profile is in pure Python and the hotshot can be seen as a small subset of a cProfile. The motivation to implement a new profiler is that all of these profilers lacks the support of multi-threaded programs. If you want to profile a multi-threaded application, you must give an entry point to these profilers and then maybe merge the outputs. None of these profilers is designed to work on long-running multi-threaded application. While implementing a game server, it turns out that is is impossible to profile an application retrieve the statistics then stop and then start later on on the fly(without affecting the profiled application). With the experience of implementing a game server in Python, we have identified most of the problems, tricky parts regarding profiler usage and so, we have come up with simple but powerful requirements.


  • Profiler results can be saved in callgrind and pstat formats. (new in 0.82)
  • Profiler results can be merged from different sessions on-the-fly. (new in 0.82)
  • Profiler results can be easily converted to pstats. (new in 0.82)
  • Supports profiling per-thread CPU time. See for details. (new in 0.62)
  • Profiling of multithreaded Python applications transparently.
  • Profiler can be started from any thread at any time.
  • Ability to get statistics at any time without even stopping the profiler.
  • Various flags to arrange/sort profiler results.


  • Threads must be derived from "threading" module's Thread object.
  • Latest version of Yappi supports Python 2.6.x <= x <= Python.3.4

Recent activity

Tip: Filter by directory path e.g. /media app.js to search for public/media/app.js.
Tip: Use camelCasing e.g. ProjME to search for
Tip: Filter by extension type e.g. /repo .js to search for all .js files in the /repo directory.
Tip: Separate your search with spaces e.g. /ssh pom.xml to search for src/ssh/pom.xml.
Tip: Use ↑ and ↓ arrow keys to navigate and return to view the file.
Tip: You can also navigate files with Ctrl+j (next) and Ctrl+k (previous) and view the file with Ctrl+o.
Tip: You can also navigate files with Alt+j (next) and Alt+k (previous) and view the file with Alt+o.