Mercurial > hg
view tests/test-narrow-acl.t @ 44386:8f7c6656ac79
rust-nodemap: pure Rust example
To run, use `cargo run --release --example nodemap`
This demonstrates that simple scenarios entirely written
in Rust can content themselves with `NodeTree<T>`.
The example mmaps both the nodemap file and the changelog index.
We had of course to include an implementation of `RevlogIndex`
directly, which isn't much at this stage. It felt a bit
prematurate to include it in the lib.
Here are some first performance measurements, obtained with
this example, on a clone of mozilla-central with 440000
changesets:
(create) Nodemap constructed in RAM in 153.638305ms
(query CAE63161B68962) found in 22.362us: Ok(Some(269489))
(bench) Did 3 queries in 36.418µs (mean 12.139µs)
(bench) Did 50 queries in 184.318µs (mean 3.686µs)
(bench) Did 100000 queries in 31.053461ms (mean 310ns)
To be fair, even between bench runs, results tend to depend whether
the file is still in kernel caches, and it's not so easy to
get back to a real cold start. The worst we've seen was in the
50us ballpark.
In any busy server setting, the pages would always be in RAM.
We hope it's good enough not to be significantly slower on any
concrete Mercurial operation than the C nodetree when fully in RAM,
and of course this implementation has the serious headstart advantage
of persistence.
Differential Revision: https://phab.mercurial-scm.org/D7797
author | Georges Racinet <georges.racinet@octobus.net> |
---|---|
date | Tue, 18 Feb 2020 19:11:15 +0100 |
parents | 280f7a095df8 |
children | 5c2a4f37eace |
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Make a narrow clone then archive it $ . "$TESTDIR/narrow-library.sh" $ hg init master $ cd master $ for x in `$TESTDIR/seq.py 3`; do > echo $x > "f$x" > hg add "f$x" > hg commit -m "Add $x" > done $ cat >> .hg/hgrc << EOF > [narrowacl] > default.includes=f1 f2 > EOF $ hg serve -a localhost -p $HGPORT1 -d --pid-file=hg.pid $ cat hg.pid >> "$DAEMON_PIDS" $ cd .. $ hg clone http://localhost:$HGPORT1 narrowclone1 requesting all changes adding changesets adding manifests adding file changes added 3 changesets with 2 changes to 2 files new changesets * (glob) updating to branch default 2 files updated, 0 files merged, 0 files removed, 0 files unresolved The clone directory should only contain f1 and f2 $ ls -1 narrowclone1 | sort f1 f2 Requirements should contain narrowhg $ cat narrowclone1/.hg/requires | grep narrowhg narrowhg-experimental NarrowHG should track f1 and f2 $ hg -R narrowclone1 tracked I path:f1 I path:f2