[Building Sakai] Question About Realm Caching

[Stoufer,R M]

Thanks Sam,

I'll pass the info along to the people who can make this happen.

Mike

--

Michael Stoufer
Office of Academic Technology
Instructional Computing Services

________________________________
From: Sam Ottenhoff [ottenhoff at longsight.com]
Sent: Wednesday, December 18, 2013 2:21 PM
To: Stoufer,R M
Cc: (sakai-dev at collab.sakaiproject.org)
Subject: Re: [Building Sakai] Question About Realm Caching


org.sakaiproject.authz.impl.DbAuthzGroupService.realmRoleGroupCache: count:5000 hits:1657342 misses:150730 hit%:91

org.sakaiproject.db.BaseDbFlatStorage.SAKAI_REALM_PROPERTY: count:10000 hits:1416478 misses:385363 hit%:78


These both look like maxed-out caches.  If they are overflowing to disk, your performance will be even worse than that of a normal maxed-out cache.  If you have available RAM in the Java heap, raise these cache sizes.  Look for any other caches with a round number like 5000 or 10000 or 100000 and raise those too if you have RAM available.  Increase the timeToLive on the caches to increase the benefit of the caches.


I just noticed that overflowToDisk is true on the last item.  We have been changing that setting to false most everywhere and I wonder if we should do that here?

Absolutely,  overflowToDisk is harmful and should be turned off everywhere.

--Sam
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://collab.sakaiproject.org/pipermail/sakai-dev/attachments/20131218/7fddcbbe/attachment.html