Mercurial > hg
view tests/test-eol-clone.t @ 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> |
---|---|
date | Fri, 30 Apr 2021 14:22:14 +0200 |
parents | 95a615dd77bf |
children | dcaa2df1f688 |
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Testing cloning with the EOL extension $ cat >> $HGRCPATH <<EOF > [extensions] > eol = > > [eol] > native = CRLF > EOF setup repository $ hg init repo $ cd repo $ cat > .hgeol <<EOF > [patterns] > **.txt = native > EOF $ printf "first\r\nsecond\r\nthird\r\n" > a.txt $ hg commit --addremove -m 'checkin' adding .hgeol adding a.txt Test commit of removed .hgeol and how it immediately makes the automatic changes explicit and committable. $ cd .. $ hg clone repo repo-2 updating to branch default 2 files updated, 0 files merged, 0 files removed, 0 files unresolved $ cd repo-2 $ cat a.txt first\r (esc) second\r (esc) third\r (esc) $ hg cat a.txt first second third $ hg remove .hgeol $ touch a.txt * # ensure consistent st dirtyness checks, ignoring dirstate timing $ hg st -v --debug M a.txt R .hgeol $ hg commit -m 'remove eol' $ hg exp # HG changeset patch # User test # Date 0 0 # Thu Jan 01 00:00:00 1970 +0000 # Node ID 3c20c2d90333b6ecdc8f7aa8f9b73223c7c7a608 # Parent 90f94e2cf4e24628afddd641688dfe4cd476d6e4 remove eol diff -r 90f94e2cf4e2 -r 3c20c2d90333 .hgeol --- a/.hgeol Thu Jan 01 00:00:00 1970 +0000 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,2 +0,0 @@ -[patterns] -**.txt = native diff -r 90f94e2cf4e2 -r 3c20c2d90333 a.txt --- a/a.txt Thu Jan 01 00:00:00 1970 +0000 +++ b/a.txt Thu Jan 01 00:00:00 1970 +0000 @@ -1,3 +1,3 @@ -first -second -third +first\r (esc) +second\r (esc) +third\r (esc) $ hg push --quiet $ cd .. Test clone of repo with .hgeol in working dir, but no .hgeol in default checkout revision tip. The repo is correctly updated to be consistent and have the exact content checked out without filtering, ignoring the current .hgeol in the source repo: $ cat repo/.hgeol [patterns] **.txt = native $ hg clone repo repo-3 -v --debug linked 7 files updating to branch default resolving manifests branchmerge: False, force: False, partial: False ancestor: 000000000000, local: 000000000000+, remote: 3c20c2d90333 calling hook preupdate.eol: hgext.eol.preupdate a.txt: remote created -> g getting a.txt 1 files updated, 0 files merged, 0 files removed, 0 files unresolved updating the branch cache $ cd repo-3 $ cat a.txt first\r (esc) second\r (esc) third\r (esc) Test clone of revision with .hgeol $ cd .. $ hg clone -r 0 repo repo-4 adding changesets adding manifests adding file changes added 1 changesets with 2 changes to 2 files new changesets 90f94e2cf4e2 updating to branch default 2 files updated, 0 files merged, 0 files removed, 0 files unresolved $ cd repo-4 $ cat .hgeol [patterns] **.txt = native $ cat a.txt first\r (esc) second\r (esc) third\r (esc) $ cd ..