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| * New compression formats are fully supported in bundles and the wire protocol. There is experimental support for different compression in revlogs. | |
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| * Bundles using zstd are faster to create and smaller than zlib bundles | * HTTP payloads for many commands will now use zstd by default (as opposed to zlib) when both client and server support it |
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| * An experimental ``hg debugupgraderepo`` command allows in-place upgrading of repositories to the latest storage format. |
Mercurial 4.1 release
![/!\](/moin-static/modernized/img/alert.png "/!\"){kind=small}
This is a draft and may not accurately reflect what lands in the 4.1 release.
1. Features
- A new extensible "compression engines" API has been implemented. Support for a new compression format can now be implemented in extensions.
- New compression formats are fully supported in bundles and the wire protocol. There is experimental support for different compression in revlogs.
- zstd - a new and exciting compression engine - is now distributed with Mercurial and built by default
- HTTP payloads for many commands will now use zstd by default (as opposed to zlib) when both client and server support it
A new statistical profiler has been added and made the default profiler for --profile. This profiler gives more accurate results than Python's built-in cProfile (the previous default) because the profiler overhead is much smaller. The output from --profile now displays the code hot path by default. This allows Mercurial developers to more accurately identify performance problems.
New followlines(file, from:to, startrev=.) revset predicate to track a part of changes.
- Experimental support for additional git-diff features.
Troubled changes (from ChangesetEvolution) are noted more prominently in a few places.
An experimental hg debugupgraderepo command allows in-place upgrading of repositories to the latest storage format.
2. Improvements
- Performance of reading individual revlog entries has been greatly improved. This will be noticeable when performing changelog scans on large repositories (such as when executing certain revsets).
- The low-level content diffing algorithm is now ~2x faster. Operations that write data to the repository (like commit) can be noticeably faster as a result.