Mercurial > hg
view relnotes/5.3 @ 51108:0250e45040f1
revlog: add a small cache of unfiltered chunk
This can provides a massive boost to the reading of multiple revision and the
computation of a valid delta chain.
This greatly help operation like `hg log --patch`, delta computation (helping
pull/unbundle), linkrev adjustment (helping copy tracing).
A first round of benchmark for `hg log --patch --limit 1000` shows improvement
in the 10-20% range on "small" repository like pypy or mercurial and large
improvements (about 33%) for more complex ones like netbeans and mozilla's.
These speeds up are consistent with the improvement to `hg pull` (from a server
sending poor deltas) I saw benchmarking this last year. Further benchmark will
be run during the freeze.
I added some configuration in the experimental space to be able to further test
the effect of various tuning for now. This feature should fit well in the
"usage/resource profile" configuration that we should land next cycle.
When it does not provides a benefit the overhead of the cache seem to be around
2%, a small price for the big improvement. In addition I believe we could shave
most of this overhead with a more efficent lru implementation.
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Fri, 27 Oct 2023 08:54:41 +0200 |
parents | 1f8f215219ff |
children |
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== New Features == * Windows will process hgrc files in %PROGRAMDATA%\Mercurial\hgrc.d. == New Experimental Features == == Bug Fixes == * The `indent()` template function was documented to not indent empty lines, but it still indented the first line even if it was empty. It no longer does that. == Backwards Compatibility Changes == == Internal API Changes == * Matcher instances no longer have a `explicitdir` property. Consider rewriting your code to use `repo.wvfs.isdir()` and/or `ctx.hasdir()` instead. Also, the `traversedir` property is now also called when only `explicitdir` used to be called. That may mean that you can simply remove the use of `explicitdir` if you were already using `traversedir`. * The `revlog.nodemap` object have been merged into the `revlog.index` object. * `n in revlog.nodemap` becomes `revlog.index.has_node(n)`, * `revlog.nodemap[n]` becomes `revlog.index.rev(n)`, * `revlog.nodemap.get(n)` becomes `revlog.index.get_rev(n)`. * `copies.duplicatecopies()` was renamed to `copies.graftcopies()`. Its arguments changed from revision numbers to context objects. It also lost its `repo` and `skip` arguments (they should no longer be needed).