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Filter to possible package paths before trying to resolve a module. by falsedrow · Pull Request #18038 · python/mypy · GitHub
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With a long sys.path (it's got 300 entries), this removes 94% of stat syscalls from running mypy. With all the filesystem caching, that's only a small time savings, though it will depend on your filesystem. Local benchmarks showed a 20% time savings but they're pretty noisy from all the I/O.

With a long sys.path (it's got 300 entries), this removes 94% of stat syscalls
from running mypy. With all the filesystem caching, that's only a small time savings,
though it will depend on your filesystem.
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Awesome stuff! I pushed two commits to try and get tests passing, I'll also run this through the benchmarking setup that I had going :-)

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hauntsaninja commented Oct 25, 2024

Okay, I benchmarked ac79825 as the following on mypy -c 'import torch' (see #17948 for description of the environments):

  • 1.09x faster in long environment
  • 1.06x faster in openai environment
  • 1.42x faster in long environment (incremental)
  • 1.22x faster in openai environment (incremental)

I'll check the extra normpath is slowing us down, if so should be very easy to save (update: looks like this might be a few 100ms, so a couple more percent)

Doing this also uncovered a minor regression from #15347 , which I shall try to fix... (update: I think best done in a new PR)

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According to mypy_primer, this change doesn't affect type check results on a corpus of open source code. ✅

@hauntsaninja hauntsaninja merged commit 715b768 into python:master Oct 25, 2024
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hauntsaninja added a commit that referenced this pull request Oct 26, 2024
Follow up to #18038

This maybe should have been two PRs
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3 participants