## page was renamed from ConvertParentdelta
== CompressExtension ==
'''This extension is not distributed with Mercurial.'''
<<TableOfContents>>

''Author:Pradeepkumar Gayam''

Download site:http://selenic.com/hg/file/tip/contrib/compress.py

=== Overview ===
This extension is used to convert normal repositories into parentdelta repos. It reads revision of each file and rewrites the in new repository. It can be used to observe the affect of changes made in `revision()` and `addrevision()` functions in revlog. This was written aiming to convert a repository to parent delta repo. Some optimization can be done to cost less CPU.

=== Configuration ===
Configure your `.hgrc` to enable the extension by adding following lines:

{{{
[extensions]
compress = /path/to/file
}}}
=== Usage ===
`hg --config format.parentdelta=True compress -R from to`

=== Stats ===
Inserting full revision at a distance of `2 * len(fulltext)`, the Mercurial repository compressed from 11MB to 4.4MB.

At a distance of `4 * len(fulltext)`: 11MB to 4.2MB.

At a distance of `6 * len(fulltext)`: 11MB to 2.0MB.

`danchr` in IRC quotes that 2GB repo compressed to ~380MB.

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CategoryExtensionsByOthers