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From Stefan Fuhrmann <stefan.fuhrm...@wandisco.com>
Subject Re: Performance issue with svn export [svn 1.8.11]
Date Sun, 31 May 2015 09:40:16 GMT
From: Nouha Terzi <terzi.nouha_at_gmail.com>
Date: Tue, 26 May 2015 17:05:41 +0100

Hello all,
>
> we are deploying svn 1.8.11 on our server Rhel 6.6.
> We are facing some issue within svn export.
> it seems that it has some perf limitation when dealing with a huge number
> of files.
>
> we have this delay when doing an svn export url and the target has:
>
> less than 20k files export = ~ 1 minute
>
> more than 30k files export > 1 hour
>
> Is it a known issue? Has someone encouter thsi behavior?
>

There is a known issues that might apply: The number of
entries (immediate children) in a directory should not exceed
a few 1000, see the warning box in 1.7 release notes:

http://subversion.apache.org/docs/release-notes/1.7.html#server-performance-tuning

If all 30k files are from a single "flat" directory or is there one
large directory somewhere in this tree, you'll hit that issue.

Having directories with many 1000 entries is all kinds of bad.
Don't do it. If you really have to do it, increase the SVN server
cache size. Note that you have to quadruple the cache size
to double the maximum cache-able object size.

-- Stefan^2.

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