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Yet Another Python Profiler, but this time multithreading, asyncio and gevent aware.
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sumerc/yappi
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A tracing profiler that ismultithreading, asyncio and gevent aware.
- Fast: Yappi is fast. It is completely written in C and lots of love and care went into making it fast.
- Unique: Yappi supports multithreaded,asyncio andgevent profiling. Tagging/filtering multiple profiler results has interestinguse cases.
- Intuitive: Profiler can be started/stopped and results can be obtained from any time and any thread.
- Standards Compliant: Profiler results can be saved in callgrind or pstat formats.
- Rich in Feature set: Profiler results can show eitherWall Time or actualCPU Time and can be aggregated from different sessions. Various flags are defined for filtering and sorting profiler results.
- Robust: Yappi has been around for years.
CPython standard distribution comes with three deterministic profilers.cProfile,Profile andhotshot.cProfile is implemented as a C module based onlsprof,Profile is in pure Python andhotshot 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 onasyncio 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 ofcoroutine profiling. Withcoroutine-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 detailshere.
Can be installed via PyPI
$ pip install yappiOR from the source directly.
$ pip install git+https://github.com/sumerc/yappi#egg=yappiimportyappidefa():for_inrange(10000000):# do something CPU heavypassyappi.set_clock_type("cpu")# Use set_clock_type("wall") for wall timeyappi.start()a()yappi.get_func_stats().print_all()yappi.get_thread_stats().print_all()'''Clock type: CPUOrdered by: totaltime, descname ncall tsub ttot tavgdoc.py:5 a 1 0.117907 0.117907 0.117907name id tid ttot scnt_MainThread 0 139867147315008 0.118297 1'''
You can profile a multithreaded application via Yappi and can easily retrieveper-thread profile information by filtering onctx_id withget_func_stats API.
importyappiimporttimeimportthreading_NTHREAD=3def_work(n):time.sleep(n*0.1)yappi.start()threads= []# generate _NTHREAD threadsforiinrange(_NTHREAD):t=threading.Thread(target=_work,args=(i+1, ))t.start()threads.append(t)# wait all threads to finishfortinthreads:t.join()yappi.stop()# retrieve thread stats by their thread id (given by yappi)threads=yappi.get_thread_stats()forthreadinthreads:print("Function stats for (%s) (%d)"% (thread.name,thread.id) )# it is the Thread.__class__.__name__yappi.get_func_stats(ctx_id=thread.id).print_all()'''Function stats for (Thread) (3)name ncall tsub ttot tavg..hon3.7/threading.py:859 Thread.run 1 0.000017 0.000062 0.000062doc3.py:8 _work 1 0.000012 0.000045 0.000045Function stats for (Thread) (2)name ncall tsub ttot tavg..hon3.7/threading.py:859 Thread.run 1 0.000017 0.000065 0.000065doc3.py:8 _work 1 0.000010 0.000048 0.000048Function stats for (Thread) (1)name ncall tsub ttot tavg..hon3.7/threading.py:859 Thread.run 1 0.000010 0.000043 0.000043doc3.py:8 _work 1 0.000006 0.000033 0.000033'''
You can usefilter_callback onget_func_stats API to filter on functions, modulesor whatever available inYFuncStat object.
importpackage_aimportyappiimportsysdefa():passdefb():passyappi.start()a()b()package_a.a()yappi.stop()# filter by module objectcurrent_module=sys.modules[__name__]stats=yappi.get_func_stats(filter_callback=lambdax:yappi.module_matches(x, [current_module]))# x is a yappi.YFuncStat objectstats.sort("name","desc").print_all()'''Clock type: CPUOrdered by: name, descname ncall tsub ttot tavgdoc2.py:10 b 1 0.000001 0.000001 0.000001doc2.py:6 a 1 0.000001 0.000001 0.000001'''# filter by function objectstats=yappi.get_func_stats(filter_callback=lambdax:yappi.func_matches(x, [a,b])).print_all()'''name ncall tsub ttot tavgdoc2.py:6 a 1 0.000001 0.000001 0.000001doc2.py:10 b 1 0.000001 0.000001 0.000001'''# filter by module namestats=yappi.get_func_stats(filter_callback=lambdax:'package_a'inx.module ).print_all()'''name ncall tsub ttot tavgpackage_a/__init__.py:1 a 1 0.000001 0.000001 0.000001'''# filter by function namestats=yappi.get_func_stats(filter_callback=lambdax:'a'inx.name ).print_all()'''name ncall tsub ttot tavgdoc2.py:6 a 1 0.000001 0.000001 0.000001package_a/__init__.py:1 a 1 0.000001 0.000001 0.000001'''
You can see that coroutine wall-time's are correctly profiled.
importasyncioimportyappiasyncdeffoo():awaitasyncio.sleep(1.0)awaitbaz()awaitasyncio.sleep(0.5)asyncdefbar():awaitasyncio.sleep(2.0)asyncdefbaz():awaitasyncio.sleep(1.0)yappi.set_clock_type("WALL")withyappi.run():asyncio.run(foo())asyncio.run(bar())yappi.get_func_stats().print_all()'''Clock type: WALLOrdered by: totaltime, descname ncall tsub ttot tavgdoc4.py:5 foo 1 0.000030 2.503808 2.503808doc4.py:11 bar 1 0.000012 2.002492 2.002492doc4.py:15 baz 1 0.000013 1.001397 1.001397'''
You can use yappi to profile greenlet applications now!
importyappifromgreenletimportgreenletimporttimeclassGreenletA(greenlet):defrun(self):time.sleep(1)yappi.set_context_backend("greenlet")yappi.set_clock_type("wall")yappi.start(builtins=True)a=GreenletA()a.switch()yappi.stop()yappi.get_func_stats().print_all()'''name ncall tsub ttot tavgtests/test_random.py:6 GreenletA.run 1 0.000007 1.000494 1.000494time.sleep 1 1.000487 1.000487 1.000487'''
Coroutine Profiling(new in 1.2)
Greenlet Profiling(new in 1.3)
Note: Yes. I know I should be moving docs to readthedocs.io. Stay tuned!
Special thanks to A.Jesse Jiryu Davis:
Yappi is the default profiler inPyCharm. If you have Yappi installed,PyCharm will use it. Seethe official documentation for more details.
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Yet Another Python Profiler, but this time multithreading, asyncio and gevent aware.
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