bpo-46841: Quicken code in-place #31888
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It looks like this results in a 3% memory improvement across all benchmarks: Ignore |
gvanrossum
reviewed
Mar 16, 2022
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1% perf improvement too: |
gvanrossum
reviewed
Mar 17, 2022
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This is still marked as draft, what is left to do? |
There is still an awkward spot in I’m still trying to understand the code better and figure out a cleaner way of doing this. Any ideas? |
#31968 should help. |
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I think it is OK to sort out the peculiarities of |
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If you want to schedule another build, you need to add the " |
markshannon
reviewed
Mar 21, 2022
markshannon
reviewed
Mar 21, 2022
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Buildbot failures are all pre-existing failures and unrelated to this PR. |
asvetlov
pushed a commit
to YvesDup/cpython
that referenced
this issue
Mar 25, 2022
* Moves the bytecode to the end of the corresponding PyCodeObject, and quickens it in-place. * Removes the almost-always-unused co_varnames, co_freevars, and co_cellvars member caches * _PyOpcode_Deopt is a new mapping from all opcodes to their un-quickened forms. * _PyOpcode_InlineCacheEntries is renamed to _PyOpcode_Caches * _Py_IncrementCountAndMaybeQuicken is renamed to _PyCode_Warmup * _Py_Quicken is renamed to _PyCode_Quicken * _co_quickened is renamed to _co_code_adaptive (and is now a read-only memoryview). * Do not emit unused nonzero opargs anymore in the compiler.
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This moves the bytecode to the end of the corresponding
PyCodeObject, and quickens it in-place.Related changes:
PyCodeObjectis now more compact. I've removed the almost-always-unusedco_varnames,co_freevars, andco_cellvarsmember caches, and rearranged someintmembers to fill some holes in the struct on 64-bit builds.co_codehas been removed and replaced with_PyCode_GetCode, andco_quickenedandco_firstinstrhave been replaced with_PyCode_CODE._PyOpcode_Deoptis a new mapping from all opcodes to their un-quickened forms._PyOpcode_InlineCacheEntriesis renamed to_PyOpcode_Caches,_Py_IncrementCountAndMaybeQuickenis renamed to_PyCode_Warmup,_Py_Quickenis renamed to_PyCode_Quicken, and_co_quickenedis renamed to_co_code_adaptive(and is now a read-onlymemoryview).https://bugs.python.org/issue46841