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Re: Weirdness

From: C. Michael Pilato <cmpilato_at_collab.net>
Date: 2006-06-13 20:11:21 CEST

Artem Egorkine wrote:
> I have a simple test case: I add to my repository a thousand nested
> directories and try to
> check them in
> 0
> 0/0
> 0/0/0
> 0/0/0/0
> ...
> The back-end is BDB over DAV. BDB is 4.3.29, Apache is 2.2.2, SVN is
> 1.3.1 (or trunk)
> The check-in is successful, but on cleanup the apache process starts
> to grow in memory while being in the "Closing connection" state.
> Similarly, if using ra_local, the SVN process starts to grow in memory
> and check-in never finishes.

I tried to reproduce this with 1.4.0-rc1. The 'svn add' step was a memory
hog indeed, growing up to 250M of usage, but succeeding. The commit step,
however, was a quick jump to 55M (likely entries caching, working copy
locking, etc.), and held steady there for the duration of the commit. But
during post-commit deltification, it just seemed to spin. I attached to the
process, and found 300 stack levels of recursion in deltify_mutable(). I
continued, and interrupted a little while later to find 98 recursion levels
of apr_pool_walk_tree() below 353 recursions of deltify_mutable()!!

Clearly, there's an algorithm that's not scaling so well.

C. Michael Pilato <cmpilato@collab.net>
CollabNet   <>   www.collab.net   <>   Distributed Development On Demand

Received on Tue Jun 13 20:12:22 2006

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