Does Cyrus benefit greatly from increased FS buffer cache?

John Widera jwidera at
Tue Apr 14 16:14:39 EDT 2009


Last week we posted to the list for info about running Cyrus on 64-bit
RHEL.  But we also needed to ask a more direct question about caching,
though, and didn't.  So we are now...

That q. is, does Cyrus actually benefit from large amounts of memory in an
environment with just a few thousand users ( <1000 simultaneous sessions)
and, say, up to 750GB of mail spool?

Our plan is to throw 12-16GB at it, with the purpose of vastly increasing
the FS buffer cache (and decreasing I/O).  Or, will that just be a waste
of RAM?

Some indications are that, yes, it does improve performance notably:

Anyone have any specific thoughts?  Is there any other benefit we might
see from large memory allocation in 64-bit architecture?


John Widera
Oakton Community College
Des Plaines and Skokie, IL

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