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Re: [Nmh-workers] some indexing results

From: Valdis . Kletnieks
Subject: Re: [Nmh-workers] some indexing results
Date: Tue, 15 Feb 2011 10:42:34 -0500

On Tue, 15 Feb 2011 14:53:42 GMT, Paul Vixie said:
> on the strength of observations made by somebody else here recently, i tried
> moving my mail store from ZFS to UFS.
> scan results for +inbox, ~4000 messages.
> UFS (3Ware mirror):
> 0.114u 0.076s 0:00.21 85.7%     138+1461k 1+0io 0pf+0w

> ZFS (raidz2):
> 0.440u 1.273s 0:33.47 5.1%      143+1507k 0+0io 0pf+0w

> my sleepycat version is no faster than the UFS numbers above.  apparently i
> have been the victim of "zfs fragmentation".

00.21 versus 33.47?  I'd really investigate hot/cold cache effects
there.  If you "just" moved it to UFS, a copy is probably still in
cache.  Any way to flush the in-memory file cache on your box and
try again?

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