Mercurial > hg
annotate mercurial/cext/osutil.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 |
children | c6a3243567b6 |
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1 from typing import ( |
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2 AnyStr, |
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3 IO, |
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4 List, |
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5 Sequence, |
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6 ) |
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7 |
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8 version: int |
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9 |
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10 class stat: |
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11 st_dev: int |
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12 st_mode: int |
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13 st_nlink: int |
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14 st_size: int |
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15 st_mtime: int |
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16 st_ctime: int |
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17 |
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18 def listdir(path: bytes, st: bool, skip: bool) -> List[stat]: ... |
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19 def posixfile(name: AnyStr, mode: bytes, buffering: int) -> IO: ... |
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20 def statfiles(names: Sequence[bytes]) -> List[stat]: ... |
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21 def recvfds(sockfd: int) -> List[int]: ... |
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22 def setprocname(name: bytes) -> None: ... |
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23 def getfstype(path: bytes) -> bytes: ... |
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24 def getfsmountpoint(path: bytes) -> bytes: ... |
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25 def unblocksignal(sig: int) -> None: ... |
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26 def isgui() -> bool: ... |