upstream/mercurial-mirror Files · contrib/casesmash.py

rust: Preallocate the returned `Vec` in `utils::files::relativize_path`...

rust: Preallocate the returned `Vec` in `utils::files::relativize_path` Profiling `rhg files > /dev/null` on an old snapshot of mozilla-central (with `perf` and the Firefox Profiler: https://github.com/firefox-devtools/profiler/blob/main/docs-user/guide-perf-profiling.md) showed non-trivial time spend in this function and in `realloc`. This change makes the wall-clock time for that process on my machine go from ~190 ms to ~150 ms. Differential Revision: https://phab.mercurial-scm.org/D10199

Augie Fackler - - Load All Authors

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      from __future__ import absolute_import

      import __builtin__

      import os

      from mercurial import util

      def lowerwrap(scope, funcname):

          f = getattr(scope, funcname)

          def wrap(fname, *args, **kwargs):

              d, base = os.path.split(fname)

              try:

                  files = os.listdir(d or '.')

              except OSError:

                  files = []

              if base in files:

                  return f(fname, *args, **kwargs)

              for fn in files:

                  if fn.lower() == base.lower():

                      return f(os.path.join(d, fn), *args, **kwargs)

              return f(fname, *args, **kwargs)

          scope.__dict__[funcname] = wrap

      def normcase(path):

          return path.lower()

      os.path.normcase = normcase

      for f in 'file open'.split():

          lowerwrap(__builtin__, f)

      for f in "chmod chown open lstat stat remove unlink".split():

          lowerwrap(os, f)

      for f in "exists lexists".split():

          lowerwrap(os.path, f)

      lowerwrap(util, 'posixfile')

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				from __future__ import absolute_import
				import __builtin__
				import os
				from mercurial import util


				def lowerwrap(scope, funcname):
				f = getattr(scope, funcname)

				def wrap(fname, args, *kwargs):
				d, base = os.path.split(fname)
				try:
				files = os.listdir(d or '.')
				except OSError:
				files = []
				if base in files:
				return f(fname, args, *kwargs)
				for fn in files:
				if fn.lower() == base.lower():
				return f(os.path.join(d, fn), args, *kwargs)
				return f(fname, args, *kwargs)

				scope.__dict__[funcname] = wrap


				def normcase(path):
				return path.lower()


				os.path.normcase = normcase

				for f in 'file open'.split():
				lowerwrap(__builtin__, f)

				for f in "chmod chown open lstat stat remove unlink".split():
				lowerwrap(os, f)

				for f in "exists lexists".split():
				lowerwrap(os.path, f)

				lowerwrap(util, 'posixfile')