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Re: [Nmh-workers] some indexing results

From: Paul Vixie
Subject: Re: [Nmh-workers] some indexing results
Date: Tue, 15 Feb 2011 14:53:42 +0000

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
0.110u 0.081s 0:00.21 90.4%     147+1429k 0+0io 0pf+0w
0.125u 0.066s 0:00.19 94.7%     144+1519k 0+0io 0pf+0w

ZFS (raidz2):

0.440u 1.273s 0:33.47 5.1%      143+1507k 0+0io 0pf+0w
0.369u 1.369s 0:34.00 5.0%      131+1377k 0+0io 0pf+0w
0.347u 1.383s 0:33.91 5.0%      147+1553k 0+0io 0pf+0w

my sleepycat version is no faster than the UFS numbers above.  apparently i
have been the victim of "zfs fragmentation".  i'm going to back off of trying
to put the full headers into the sleepycat and just focus on IMAP's UID's now.

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