Created
November 28, 2019 14:57
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Profile a code block
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| import cProfile | |
| import contextlib | |
| import io | |
| import pstats | |
| @contextlib.contextmanager | |
| def profile(max_results=-1, pattern="*"): | |
| """ | |
| Profile a code block | |
| :param max_results max number of results to show. -1 means no limit | |
| :param pattern filename pattern to profile. Eg. "module_name" | |
| :see https://docs.python.org/2/library/profile.html | |
| Example: | |
| with profiled(): | |
| Session.query(FooClass).filter(FooClass.somevalue==8).all() | |
| Output: | |
| 13726 function calls (13042 primitive calls) in 0.014 seconds | |
| Ordered by: cumulative time | |
| ncalls tottime percall cumtime percall filename:lineno(function) | |
| 222/21 0.001 0.000 0.011 0.001 lib/sqlalchemy/orm/loading.py:26(instances) | |
| 220/20 0.002 0.000 0.010 0.001 lib/sqlalchemy/orm/loading.py:327(_instance) | |
| 20 0.000 0.000 0.010 0.000 lib/sqlalchemy/orm/strategies.py:987(load_collection_from_subq) | |
| 1 0.000 0.000 0.009 0.009 lib/sqlalchemy/orm/strategies.py:940(_load) | |
| ... | |
| """ | |
| pr = cProfile.Profile() | |
| pr.enable() | |
| yield | |
| pr.disable() | |
| s = io.StringIO() | |
| ps = pstats.Stats(pr, stream=s).sort_stats("cumulative") | |
| ps.print_stats(max_results, pattern) | |
| print(s.getvalue()) |
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