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store: don't read the whole fncache in memory...
store: don't read the whole fncache in memory In large repositories with lot of files, the fncache grows more than 100 MB and reading that whole thing into memory slows things down. Let's not read the whole thing into memory. This patch changes fncache loading code to read 1 MB at once. Loading 1 MB at once saves ~1 sec on perffncacheload for our internal repository. I tried various values such as 0.5 MB, 5 MB, 10 MB but best results were produced using 1 MB as the chunksize. On a narrow clone with fncache around 40 MB, this patch saves ~0.04 seconds on average on perffncacheload. To test the code, I have coded an extension in test-fncache.t which set chunksize to 1 byte, and the test passes with that. Differential Revision: https://phab.mercurial-scm.org/D5296
Siddharth Agarwal - - Load All Authors

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exceptions.py
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/ mercurial / thirdparty / attr / exceptions.py
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from __future__ import absolute_import, division, print_function
class FrozenInstanceError(AttributeError):
"""
A frozen/immutable instance has been attempted to be modified.
It mirrors the behavior of ``namedtuples`` by using the same error message
and subclassing :exc:`AttributeError`.
.. versionadded:: 16.1.0
"""
msg = "can't set attribute"
args = [msg]
class AttrsAttributeNotFoundError(ValueError):
"""
An ``attrs`` function couldn't find an attribute that the user asked for.
.. versionadded:: 16.2.0
"""
class NotAnAttrsClassError(ValueError):
"""
A non-``attrs`` class has been passed into an ``attrs`` function.
.. versionadded:: 16.2.0
"""
class DefaultAlreadySetError(RuntimeError):
"""
A default has been set using ``attr.ib()`` and is attempted to be reset
using the decorator.
.. versionadded:: 17.1.0
"""