| msg235754 - (view) |
Author: Antoine Pitrou (pitrou) *  |
Date: 2015-02-11 16:28 |
| Recent gcc versions have an optimization level named "-Og". It enables all optimizations that do not break debugging. Here is a patch that uses it on debug builds. Without the patch I get the following time for the whole test suite: $ time ./python -m test -j12 [...] real 3m51.670s user 11m53.039s sys 0m28.300s With the patch it goes down to: real 2m36.378s user 7m13.743s sys 0m29.728s So the test suite is 33% faster to pass. |
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| msg235755 - (view) |
Author: Serhiy Storchaka (serhiy.storchaka) * |
Date: 2015-02-11 16:44 |
| Most slow tests are skipped without -uall. As for the patch, may be use AX_CHECK_COMPILE_FLAG [1]? [1] http://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html |
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| msg235756 - (view) |
Author: Antoine Pitrou (pitrou) * |
Date: 2015-02-11 17:10 |
| -uall, without patch: real 5m47.290s user 18m28.405s sys 0m29.493s -uall, with patch: real 3m35.132s user 10m26.345s sys 0m30.351s That's a 38% speedup. |
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| msg235757 - (view) |
Author: Antoine Pitrou (pitrou) * |
Date: 2015-02-11 17:11 |
| > As for the patch, may be use AX_CHECK_COMPILE_FLAG [1]? It's not used elsewhere in configure.ac. I reused the idiom used a couple lines above. |
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| msg235759 - (view) |
Author: Serhiy Storchaka (serhiy.storchaka) * |
Date: 2015-02-11 18:00 |
| This looks pretty harmless. Some slow buildbots run tests very long time and failed with timeout after 3600 seconds. May be this patch will make them faster. Yet one advantage -- the code compiled with partial optimization will be closer to the code compiled with full optimization. Therefore debugging version could catch more bugs that exist only with optimization. But may be apply this only to 3.5? |
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| msg235760 - (view) |
Author: Antoine Pitrou (pitrou) * |
Date: 2015-02-11 18:03 |
| I'd like to apply it to 3.4 as well, because it makes development more pleasant. |
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| msg235763 - (view) |
Author: Roundup Robot (python-dev)  |
Date: 2015-02-11 18:41 |
| New changeset e37b201297d2 by Antoine Pitrou in branch '3.4': Issue #23445: pydebug builds now use "gcc -Og" where possible, to make the resulting executable faster. https://hg.python.org/cpython/rev/e37b201297d2 New changeset 527ed5205806 by Antoine Pitrou in branch 'default': Issue #23445: pydebug builds now use "gcc -Og" where possible, to make the resulting executable faster. https://hg.python.org/cpython/rev/527ed5205806 |
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| msg235764 - (view) |
Author: Antoine Pitrou (pitrou) * |
Date: 2015-02-11 18:41 |
| Done. It shouldn't break anything. |
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| msg239406 - (view) |
Author: Roundup Robot (python-dev) |
Date: 2015-03-27 14:44 |
| New changeset c663dbb84c8c by Victor Stinner in branch '3.4': Issue #23445: Fix test.support.python_is_optimized() for CFLAGS=-Og https://hg.python.org/cpython/rev/c663dbb84c8c New changeset 5b5a22b9327b by Victor Stinner in branch '2.7': Issue #23445: Fix test_gdb.python_is_optimized() for CFLAGS=-Og https://hg.python.org/cpython/rev/5b5a22b9327b |
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| msg239407 - (view) |
Author: STINNER Victor (vstinner) * |
Date: 2015-03-27 14:48 |
| > Done. It shouldn't break anything. You're change skipped some test_gdb tests. I fixed the check in test_gdb/test.support. |
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| msg353754 - (view) |
Author: STINNER Victor (vstinner) * |
Date: 2019-10-02 16:57 |
| I created bpo-38350 to propose to revert this change. |
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This issue has been migrated to GitHub: https://github.com/python/cpython/issues/67633