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List: zope-dev
Subject: [Zope-dev] OFS.Image.File thrashes ZODB Connection Cache
From: Tres Seaver <tseaver () palladion ! com>
Date: 2007-10-25 22:03:20
Message-ID: ffr3rv$dtg$1 () ger ! gmane ! org
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In current Zope2 (ZODB <= 3.7.2), the OFS.Image.File object's
'index_html' shows particularly obnoxious tendency to destroy locality
of reference in the connection cache. I wrote the problem up as a
Launchpad bug:
https://bugs.launchpad.net/zope2/+bug/157245
That bug report also sketches a solution: I have checked in an initial
stab at implementing it on a branch in SVN:
http://svn.zope.org/Sandbox/tseaver/no_pdata_in_cache_dammit/
Thoughts?
I realize that a not-yet-released Zope2 which uses the ZODB 3.8 blob
storage stuff might not have this problem (assuming that OFS.Image.File
is updated to take advantage of blobs). Also, as I note in the issue,
the fix doesn't help the thrashing of the disk-based cache used by ZEO
client connections.
Tres.
- --
===================================================================
Tres Seaver +1 540-429-0999 tseaver@palladion.com
Palladion Software "Excellence by Design" http://palladion.com
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