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  • Try profiling Datasette using scalene · 2 ✖

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775442039 https://github.com/simonw/datasette/issues/1219#issuecomment-775442039 https://api.github.com/repos/simonw/datasette/issues/1219 MDEyOklzc3VlQ29tbWVudDc3NTQ0MjAzOQ== simonw 9599 2021-02-08T20:39:52Z 2021-02-08T22:13:00Z OWNER

This comment helped me find a pattern for running Scalene against the Datasette test suite: https://github.com/emeryberger/scalene/issues/70#issuecomment-755245858

pip install scalene Then I created a file called run_tests.py with the following contents: python if __name__ == "__main__": import sys, pytest pytest.main(sys.argv) Then I ran this: scalene --profile-all run_tests.py -sv -x . But... it quit with a segmentation fault! ``` (datasette) datasette % scalene --profile-all run_tests.py -sv -x . ======================================================================== test session starts ======================================================================== platform darwin -- Python 3.8.6, pytest-6.0.1, py-1.9.0, pluggy-0.13.1 -- python cachedir: .pytest_cache rootdir: /Users/simon/Dropbox/Development/datasette, configfile: pytest.ini plugins: asyncio-0.14.0, timeout-1.4.2 collecting ... Fatal Python error: Segmentation fault

Current thread 0x0000000110c1edc0 (most recent call first): File "/Users/simon/Dropbox/Development/datasette/datasette/utils/init.py", line 553 in detect_json1 File "/Users/simon/Dropbox/Development/datasette/datasette/filters.py", line 168 in Filters File "/Users/simon/Dropbox/Development/datasette/datasette/filters.py", line 94 in <module> File "<frozen importlib._bootstrap>", line 219 in _call_with_frames_removed File "<frozen importlib._bootstrap_external>", line 783 in exec_module File "<frozen importlib._bootstrap>", line 671 in _load_unlocked File "<frozen importlib._bootstrap>", line 975 in _find_and_load_unlocked File "<frozen importlib._bootstrap>", line 991 in _find_and_load File "/Users/simon/Dropbox/Development/datasette/datasette/views/table.py", line 27 in <module> File "<frozen importlib._bootstrap>", line 219 in _call_with_frames_removed File "<frozen importlib._bootstrap_external>", line 783 in exec_module File "<frozen importlib._bootstrap>", line 671 in _load_unlocked File "<frozen importlib._bootstrap>", line 975 in _find_and_load_unlocked File "<frozen importlib._bootstrap>", line 991 in _find_and_load File "/Users/simon/Dropbox/Development/datasette/datasette/app.py", line 42 in <module> File "<frozen importlib._bootstrap>", line 219 in _call_with_frames_removed File "<frozen importlib._bootstrap_external>", line 783 in exec_module File "<frozen importlib._bootstrap>", line 671 in _load_unlocked File "<frozen importlib._bootstrap>", line 975 in _find_and_load_unlocked File "<frozen importlib._bootstrap>", line 991 in _find_and_load File "/Users/simon/Dropbox/Development/datasette/tests/test_api.py", line 1 in <module> File "/Users/simon/.local/share/virtualenvs/datasette-AWNrQs95/lib/python3.8/site-packages/_pytest/assertion/rewrite.py", line 170 in exec_module File "<frozen importlib._bootstrap>", line 671 in _load_unlocked File "<frozen importlib._bootstrap>", line 975 in _find_and_load_unlocked File "<frozen importlib._bootstrap>", line 991 in _find_and_load File "<frozen importlib._bootstrap>", line 1014 in _gcd_import File "/usr/local/opt/python@3.8/Frameworks/Python.framework/Versions/3.8/lib/python3.8/importlib/init.py", line 127 in import_module File "/Users/simon/.local/share/virtualenvs/datasette-AWNrQs95/lib/python3.8/site-packages/_pytest/pathlib.py", line 520 in import_path File "/Users/simon/.local/share/virtualenvs/datasette-AWNrQs95/lib/python3.8/site-packages/_pytest/python.py", line 552 in _importtestmodule File "/Users/simon/.local/share/virtualenvs/datasette-AWNrQs95/lib/python3.8/site-packages/_pytest/python.py", line 484 in _getobj File "/Users/simon/.local/share/virtualenvs/datasette-AWNrQs95/lib/python3.8/site-packages/_pytest/python.py", line 288 in obj File "/Users/simon/.local/share/virtualenvs/datasette-AWNrQs95/lib/python3.8/site-packages/_pytest/python.py", line 500 in _inject_setup_module_fixture File "/Users/simon/.local/share/virtualenvs/datasette-AWNrQs95/lib/python3.8/site-packages/_pytest/python.py", line 487 in collect File "/Users/simon/.local/share/virtualenvs/datasette-AWNrQs95/lib/python3.8/site-packages/_pytest/runner.py", line 324 in <lambda> File "/Users/simon/.local/share/virtualenvs/datasette-AWNrQs95/lib/python3.8/site-packages/_pytest/runner.py", line 294 in from_call File "/Users/simon/.local/share/virtualenvs/datasette-AWNrQs95/lib/python3.8/site-packages/_pytest/runner.py", line 324 in pytest_make_collect_report File "/Users/simon/.local/share/virtualenvs/datasette-AWNrQs95/lib/python3.8/site-packages/pluggy/callers.py", line 187 in _multicall File "/Users/simon/.local/share/virtualenvs/datasette-AWNrQs95/lib/python3.8/site-packages/pluggy/manager.py", line 84 in <lambda> File "/Users/simon/.local/share/virtualenvs/datasette-AWNrQs95/lib/python3.8/site-packages/pluggy/manager.py", line 93 in _hookexec File "/Users/simon/.local/share/virtualenvs/datasette-AWNrQs95/lib/python3.8/site-packages/pluggy/hooks.py", line 286 in call File "/Users/simon/.local/share/virtualenvs/datasette-AWNrQs95/lib/python3.8/site-packages/_pytest/runner.py", line 441 in collect_one_node File "/Users/simon/.local/share/virtualenvs/datasette-AWNrQs95/lib/python3.8/site-packages/_pytest/main.py", line 768 in genitems File "/Users/simon/.local/share/virtualenvs/datasette-AWNrQs95/lib/python3.8/site-packages/_pytest/main.py", line 771 in genitems File "/Users/simon/.local/share/virtualenvs/datasette-AWNrQs95/lib/python3.8/site-packages/_pytest/main.py", line 568 in _perform_collect File "/Users/simon/.local/share/virtualenvs/datasette-AWNrQs95/lib/python3.8/site-packages/_pytest/main.py", line 516 in perform_collect File "/Users/simon/.local/share/virtualenvs/datasette-AWNrQs95/lib/python3.8/site-packages/_pytest/main.py", line 306 in pytest_collection File "/Users/simon/.local/share/virtualenvs/datasette-AWNrQs95/lib/python3.8/site-packages/pluggy/callers.py", line 187 in _multicall File "/Users/simon/.local/share/virtualenvs/datasette-AWNrQs95/lib/python3.8/site-packages/pluggy/manager.py", line 84 in <lambda> File "/Users/simon/.local/share/virtualenvs/datasette-AWNrQs95/lib/python3.8/site-packages/pluggy/manager.py", line 93 in _hookexec File "/Users/simon/.local/share/virtualenvs/datasette-AWNrQs95/lib/python3.8/site-packages/pluggy/hooks.py", line 286 in call File "/Users/simon/.local/share/virtualenvs/datasette-AWNrQs95/lib/python3.8/site-packages/_pytest/main.py", line 295 in _main File "/Users/simon/.local/share/virtualenvs/datasette-AWNrQs95/lib/python3.8/site-packages/_pytest/main.py", line 240 in wrap_session File "/Users/simon/.local/share/virtualenvs/datasette-AWNrQs95/lib/python3.8/site-packages/_pytest/main.py", line 289 in pytest_cmdline_main File "/Users/simon/.local/share/virtualenvs/datasette-AWNrQs95/lib/python3.8/site-packages/pluggy/callers.py", line 187 in _multicall File "/Users/simon/.local/share/virtualenvs/datasette-AWNrQs95/lib/python3.8/site-packages/pluggy/manager.py", line 84 in <lambda> File "/Users/simon/.local/share/virtualenvs/datasette-AWNrQs95/lib/python3.8/site-packages/pluggy/manager.py", line 93 in _hookexec File "/Users/simon/.local/share/virtualenvs/datasette-AWNrQs95/lib/python3.8/site-packages/pluggy/hooks.py", line 286 in call File "/Users/simon/.local/share/virtualenvs/datasette-AWNrQs95/lib/python3.8/site-packages/_pytest/config/init.py", line 157 in main File "run_tests.py", line 3 in <module> File "/Users/simon/.local/share/virtualenvs/datasette-AWNrQs95/lib/python3.8/site-packages/scalene/scalene_profiler.py", line 1525 in main File "/Users/simon/.local/share/virtualenvs/datasette-AWNrQs95/lib/python3.8/site-packages/scalene/main.py", line 7 in main File "/Users/simon/.local/share/virtualenvs/datasette-AWNrQs95/lib/python3.8/site-packages/scalene/main.py", line 14 in <module> File "/usr/local/opt/python@3.8/Frameworks/Python.framework/Versions/3.8/lib/python3.8/runpy.py", line 87 in _run_code File "/usr/local/opt/python@3.8/Frameworks/Python.framework/Versions/3.8/lib/python3.8/runpy.py", line 194 in _run_module_as_main Scalene error: received signal SIGSEGV ```

 
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 Try profiling Datasette using scalene 803929694  
775497449 https://github.com/simonw/datasette/issues/1219#issuecomment-775497449 https://api.github.com/repos/simonw/datasette/issues/1219 MDEyOklzc3VlQ29tbWVudDc3NTQ5NzQ0OQ== simonw 9599 2021-02-08T22:11:34Z 2021-02-08T22:11:34Z OWNER

https://github.com/emeryberger/scalene/issues/110 reports a "received signal SIGSEGV" error that was fixed by upgrading to the latest Scalene version, but I'm running that already.

 
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 Try profiling Datasette using scalene 803929694  

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