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Yet Another Python Profiler

Project description


  • Fast: Yappi is fast. It is completely written in C and lots of love&care went into making it fast.
  • Unique: Yappi supports multithreaded and asynchronous code profiling. Tagging/filtering multiple profiler results has interesting use cases.
  • Intuitive: Profiler can be started/stopped and results can be obtained from any time and any thread.
  • Standarts Complaint: Profiler results can be saved in callgrind or pstat formats.
  • Rich in Feature set: Profiler results can show either Wall Time or actual CPU Time and can be aggregated from different sessions. Various flags are defined for filtering and sorting profiler results.
  • Robust: Yappi had seen more than 8 years of production usage.


CPython standard distribution comes with three deterministic profilers. cProfile, Profile and hotshot. cProfile is implemented as a C module based on lsprof, Profile is in pure Python and hotshot can be seen as a small subset of a cProfile. The major issue is that all of these profilers lack support for multi-threaded programs and CPU time.

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 are designed to work on long-running multi-threaded applications. It is also not possible to profile an application that start/stop/retrieve traces on the fly with these profilers.

Now fast forwarding to 2019: With the latest improvements on asyncio library and asynchronous frameworks, most of the current profilers lacks the ability to show correct wall/cpu time or even call count information per-coroutine. Thus we need a different kind of approach to profile asynchronous code. Yappi, with v1.2 introduces the concept of coroutine profiling. With coroutine-profiling, you should be able to profile correct wall/cpu time and call count of your coroutine. (including the time spent in context switches, too). You can see details here.


Can be installed via PyPI

$ pip install yappi

OR from the source directly.

$ pip install git+



  • Threads must be derived from "threading" module's Thread object.

Related Talks

Special thanks to A.Jesse Jiryu Davis:

PyCharm Integration

Yappi is the default profiler in PyCharm. If you have Yappi installed, PyCharm will use it. See the official documentation for more details.

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