Mercurial > hg
annotate mercurial/cext/mpatch.pyi @ 47120:7109a38830c9
dirstate-tree: Fold "tracked descendants" counter update in main walk
For the purpose of implementing `has_tracked_dir` (which means "has tracked
descendants) without an expensive sub-tree traversal, we maintaing a counter
of tracked descendants on each "directory" node of the tree-shaped dirstate.
Before this changeset, mutating or inserting a node at a given path would
involve:
* Walking the tree from root through ancestors to find the node or the spot
where to insert it
* Looking at the previous node if any to decide what counter update is needed
* Performing any node mutation
* Walking the tree *again* to update counters in ancestor nodes
When profiling `hg status` on a large repo, this second walk takes times
while loading a the dirstate from disk.
It turns out we have enough information to decide before he first tree walk
what counter update is needed. This changeset merges the two walks, gaining
~10% of the total time for `hg update` (in the same hyperfine benchmark as
the previous changeset).
---
Profiling was done by compiling with this `.cargo/config`:
[profile.release]
debug = true
then running with:
py-spy record -r 500 -n -o /tmp/hg.json --format speedscope -- \
./hg status -R $REPO --config experimental.dirstate-tree.in-memory=1
then visualizing the recorded JSON file in https://www.speedscope.app/
Differential Revision: https://phab.mercurial-scm.org/D10554
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Fri, 30 Apr 2021 14:22:14 +0200 |
parents | 8dca9051a859 |
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1 from typing import ( |
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2 List, |
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3 ) |
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Gregory Szorc <gregory.szorc@gmail.com>
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4 |
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5 version: int |
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Gregory Szorc <gregory.szorc@gmail.com>
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6 |
8dca9051a859
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Gregory Szorc <gregory.szorc@gmail.com>
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7 class mpatchError(Exception): ... |
8dca9051a859
cext: add .pyi files for C extensions
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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8 |
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Gregory Szorc <gregory.szorc@gmail.com>
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9 def patches(text: bytes, bins: List[bytes]) -> bytes: ... |
8dca9051a859
cext: add .pyi files for C extensions
Gregory Szorc <gregory.szorc@gmail.com>
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10 def patchedsize(orig: int, data: bytes) -> int: ... |