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comparison mercurial/localrepo.py @ 42046:4ee906aa7b60

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compression: introduce an official `format.revlog-compression` option This option supersedes 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 explicit reference to `revlog` since this is the target usage here. Different storage methods might require 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 (dictionnary, pre-text, etc?) that are probably worth exploring. However, just plain switching from zlib to zstd provide a large benefit.
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Wed, 27 Mar 2019 18:26:54 +0100
parents bb271ec2fbfb
children 8de1b5a009ee
comparison
equal deleted inserted replaced
42045:d7e751ec679e 42046:4ee906aa7b60
2918 if ui.configbool('format', 'usefncache'): 2918 if ui.configbool('format', 'usefncache'):
2919 requirements.add('fncache') 2919 requirements.add('fncache')
2920 if ui.configbool('format', 'dotencode'): 2920 if ui.configbool('format', 'dotencode'):
2921 requirements.add('dotencode') 2921 requirements.add('dotencode')
2922 2922
2923 compengine = ui.config('experimental', 'format.compression') 2923 compengine = ui.config('format', 'revlog-compression')
2924 if compengine not in util.compengines: 2924 if compengine not in util.compengines:
2925 raise error.Abort(_('compression engine %s defined by ' 2925 raise error.Abort(_('compression engine %s defined by '
2926 'experimental.format.compression not available') % 2926 'format.revlog-compression not available') %
2927 compengine, 2927 compengine,
2928 hint=_('run "hg debuginstall" to list available ' 2928 hint=_('run "hg debuginstall" to list available '
2929 'compression engines')) 2929 'compression engines'))
2930 2930
2931 # zlib is the historical default and doesn't need an explicit requirement. 2931 # zlib is the historical default and doesn't need an explicit requirement.