Mercurial > hg
view relnotes/5.9 @ 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 | 809e780c72e5 |
children |
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== New Features == * `hg config` now has a `--source` option to show where each configuration value comes from. * Introduced a command (debug-repair-issue6528) to repair repositories affected by issue6528 where certain files would show up as modified even if they were clean due to an issue in the copy-tracing code. == Default Format Change == These changes affect newly created repositories (or new clone) done with Mercurial 5.9. == New Experimental Features == * A `changelogv2` format has been introduced. It is not ready for use yet, but will be used later to address some of the weaknesses of the current revlog format. * Initial experiment and support for `dirstatev2`, a new dirstate format that addresses some of the weaknesses of the current dirstate format. Python + C and Rust support are being implemented, but the Rust solution is the one currently getting the attention for performance. * Initial support for `rhg status`. `rhg` is the Rust wrapper executable for hg that shortcuts some commands for faster execution speed. == Bug Fixes == * Fixed committing empty files with `narrow` * Allow overriding `pip`'s pep517 compliance to build C or Rust extensions * Fixed regression on outgoing email when not specifying revisions * Fixed a regression causing bookmarks to disappear when using Rust persistent nodemap * Fixed a regression (in 5.9.1) introduced in 5.9 when cloning repos with deep filenames * Fixed detection of directories becoming symlinks, but only when using the Rust extensions. * Fixed ignore and include not composing in the Rust status * `hg commit --interactive` now handles deselecting edits of a rename * Fixed a case where `hg evolve` gives different results when interrupted * Fixed a memory leak in phases computation * `histedit` and `shelve` don't swallow errors when updating the working copy anymore * Improve error message when detecting content-divergence with a hidden common predecessor * No longer re-order parents in filelog, see issue6533 * Fix revisions affected by issue6533 on the fly during exchange * Many Windows fixes for stability and py3 compatibility improvements * Many other miscellaneous fixes == Backwards Compatibility Changes == == Internal API Changes == The Dirstate API have been updated as the previous function leaked some internal details and did not distinguish between two important cases: "We are changing parent and need to adjust the dirstate" and "some command is changing which file is tracked". To clarify the situation: * the following functions have been deprecated, - `dirstate.add`, - `dirstate.normal`, - `dirstate.normallookup`, - `dirstate.merge`, - `dirstate.otherparent`, - `dirstate.remove`, - `dirstate.drop`, - `dirstateitem.__getitem__`, * these new functions are added for the "adjusting parents" use-case: - `dirstate.update_file`, - `dirstate.update_file_p1`, * these new function are added for the "adjusting wc file" use-case": - `dirstate.set_tracked`, - `dirstate.set_untracked`, - `dirstate.set_clean`, - `dirstate.set_possibly_dirty`, See inline documentation of the new functions for details. * Additionally, the following have been deprecated: - `urlutil.getpath` function - `localrepository.updatecaches`' `full` argument * The following have been removed: - `revlog.revlogio` has been removed