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Re: FSFS and compression

From: Greg Hudson <ghudson_at_MIT.EDU>
Date: 2004-09-25 11:26:39 CEST

> I was wondering if FSFS repositories store deltas compressed on
> disk. Seems like my repositories got a lot smaller when I converted
> from bdb to fsfs (600MB to 240MB). A gzip compressed archive of my
> data is 235MB, so it seems to me that it's compressed via gzip or
> bz2 or something like that. Is this correct? Thanks

File contents in an FSFS repository are compressed with the vdelta
algorithm, which isn't quite as good as gzip but is still decent.
(Even if there's no delta source, the file contents can still be
"self-compressed".)

The BDB back end stores the most recent rev of each file in
uncompressed plain text, so that may explain the size difference in
your case. FSFS can also be more space-efficient than the BDB back
end when you have lots of branches with many changes on them, but that
doesn't sound like the case for you.

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Received on Sat Sep 25 11:27:08 2004

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