On Sun, Mar 31, 2019 at 8:39 AM Pierre-Yves David < pierre-yves.da...@ens-lyon.org> wrote:
> # HG changeset patch > # User Pierre-Yves David <pierre-yves.da...@octobus.net> > # Date 1553707614 -3600 > # Wed Mar 27 18:26:54 2019 +0100 > # Node ID 108e26fa0a97fe5342a1ce246cc4e4c185803454 > # Parent 28701199a78bdbab36aa422be0b4681941433823 > # EXP-Topic zstd-revlog > # Available At https://bitbucket.org/octobus/mercurial-devel/ > # hg pull https://bitbucket.org/octobus/mercurial-devel/ -r > 108e26fa0a97 > compression: introduce an official `format.revlog-compression` option > Queued parts 1-6. > > This option superseed the `experiment.format.compression` option. The value > currently supported are zlib (default) and zstd (if Mercurial was compiled > with > zstd support). > > The option gained an explicite reference to `revlog` since this is the > target > usage here. Different storage methods might requires different compression > strategies. > > In our tests, using zstd give a significant CPU usage improvement (both > compression and decompressing) while keeping similar repository size. > > Zstd as other interresting mode (dictionnaly, pre-text, etc…) that are > probably > worth exploring. However, just play switching from zlib to zstd provide a > large > benefit. > > diff --git a/mercurial/configitems.py b/mercurial/configitems.py > --- a/mercurial/configitems.py > +++ b/mercurial/configitems.py > @@ -553,9 +553,6 @@ coreconfigitem('experimental', 'extended > coreconfigitem('experimental', 'extendedheader.similarity', > default=False, > ) > -coreconfigitem('experimental', 'format.compression', > - default='zlib', > -) > coreconfigitem('experimental', 'graphshorten', > default=False, > ) > @@ -684,6 +681,10 @@ coreconfigitem('format', 'obsstore-versi > coreconfigitem('format', 'sparse-revlog', > default=True, > ) > +coreconfigitem('format', 'revlog-compression', > + default='zlib', > + alias=[('experimental', 'format.compression')] > +) > coreconfigitem('format', 'usefncache', > default=True, > ) > diff --git a/mercurial/help/config.txt b/mercurial/help/config.txt > --- a/mercurial/help/config.txt > +++ b/mercurial/help/config.txt > @@ -866,6 +866,13 @@ https://www.mercurial-scm.org/wiki/Missi > Repositories with this on-disk format require Mercurial version 4.7 > > Enabled by default. > +``revlog-compression`` > + Compression algorithm used by revlog. Supported value are `zlib` and > `zstd`. > + The `zlib` engine is the historical default of Mercurial. `zstd` is a > newer > + format that is usually a net win over `zlib` operating faster at > better > + compression rate. Use `zstd` to reduce CPU usage. > + > + On some system, Mercurial installation may lack `zstd` supports. > Default is `zlib`. > > ``graph`` > --------- > diff --git a/mercurial/localrepo.py b/mercurial/localrepo.py > --- a/mercurial/localrepo.py > +++ b/mercurial/localrepo.py > @@ -2920,10 +2920,10 @@ def newreporequirements(ui, createopts): > if ui.configbool('format', 'dotencode'): > requirements.add('dotencode') > > - compengine = ui.config('experimental', 'format.compression') > + compengine = ui.config('format', 'revlog-compression') > if compengine not in util.compengines: > raise error.Abort(_('compression engine %s defined by ' > - 'experimental.format.compression not > available') % > + 'format.revlog-compression not available') % > compengine, > hint=_('run "hg debuginstall" to list available > ' > 'compression engines')) > diff --git a/mercurial/upgrade.py b/mercurial/upgrade.py > --- a/mercurial/upgrade.py > +++ b/mercurial/upgrade.py > @@ -332,7 +332,7 @@ class compressionengine(formatvariant): > > @classmethod > def fromconfig(cls, repo): > - return repo.ui.config('experimental', 'format.compression') > + return repo.ui.config('format', 'revlog-compression') > > @registerformatvariant > class compressionlevel(formatvariant): > diff --git a/tests/test-repo-compengines.t b/tests/test-repo-compengines.t > --- a/tests/test-repo-compengines.t > +++ b/tests/test-repo-compengines.t > @@ -21,8 +21,8 @@ A new repository uses zlib storage, whic > > Unknown compression engine to format.compression aborts > > - $ hg --config experimental.format.compression=unknown init unknown > - abort: compression engine unknown defined by > experimental.format.compression not available > + $ hg --config format.revlog-compression=unknown init unknown > + abort: compression engine unknown defined by format.revlog-compression > not available > (run "hg debuginstall" to list available compression engines) > [255] > > @@ -40,7 +40,7 @@ A requirement specifying an unknown comp > > #if zstd > > - $ hg --config experimental.format.compression=zstd init zstd > + $ hg --config format.revlog-compression=zstd init zstd > $ cd zstd > $ cat .hg/requires > dotencode > @@ -66,7 +66,7 @@ with that engine or a requirement > > $ cd default > $ touch bar > - $ hg --config experimental.format.compression=zstd -q commit -A -m 'add > bar with a lot of repeated repeated repeated text' > + $ hg --config format.revlog-compression=zstd -q commit -A -m 'add bar > with a lot of repeated repeated repeated text' > > $ cat .hg/requires > dotencode > @@ -141,13 +141,13 @@ Test error cases > checking zstd options > ===================== > > - $ hg init zstd-level-default --config > experimental.format.compression=zstd > - $ hg init zstd-level-1 --config experimental.format.compression=zstd > + $ hg init zstd-level-default --config format.revlog-compression=zstd > + $ hg init zstd-level-1 --config format.revlog-compression=zstd > $ cat << EOF >> zstd-level-1/.hg/hgrc > > [storage] > > revlog.zstd.level=1 > > EOF > - $ hg init zstd-level-22 --config experimental.format.compression=zstd > + $ hg init zstd-level-22 --config format.revlog-compression=zstd > $ cat << EOF >> zstd-level-22/.hg/hgrc > > [storage] > > revlog.zstd.level=22 > @@ -172,7 +172,7 @@ checking zstd options > > Test error cases > > - $ hg init zstd-level-invalid --config > experimental.format.compression=zstd > + $ hg init zstd-level-invalid --config format.revlog-compression=zstd > $ cat << EOF >> zstd-level-invalid/.hg/hgrc > > [storage] > > revlog.zstd.level=foobar > @@ -182,7 +182,7 @@ Test error cases > abort: storage.revlog.zstd.level is not a valid integer ('foobar') > [255] > > - $ hg init zstd-level-out-of-range --config > experimental.format.compression=zstd > + $ hg init zstd-level-out-of-range --config > format.revlog-compression=zstd > $ cat << EOF >> zstd-level-out-of-range/.hg/hgrc > > [storage] > > revlog.zstd.level=42 >
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