On Mon, Dec 25, 2006 at 10:59:36AM -0500, Wesley Craig wrote: > These are interesting results. I encourage you to make an entry in > the Cyrus Wiki about the work you've been doing. As an additional > filesystem option, we've found that IMAP on reiser improves > significantly with the notail option. Good work. > > :wes notail is a lot faster: here are some new timings, with some old ones for reference Threads Mess/s 20 171.0 Reiser vanilla 20 232.1 Reiser + fakesync 20 199.8 Reiser notail 20 356.4 Reiser notail + fakesync 40 514.7 Reiser notail + fakesync (just to check scaling) 20 185,1 ext3 vanilla 20 267.3 ext3 noatime 20 393.2 ext3 noatime + fakesync Reiser with fakesync has much more variable times than the others. Reiser also has a nolog option, which I didn't try. There are quite a few more knobs to tweak for all the filesystems. The first time I tried Reiser + notail + fakesync the mailstore got damaged; I was unable to determine the exact problem (I have a feeling logging from the chroot I was running in didn't work), or to recover from it. I wiped the directories and started over. No problems on the 2nd attempt. ext3 still seems the better choice than Reiser for these tests: * No corruption during testing. * slightly faster for migration (with fakesync) * faster for safe use (w/o fakesync, though the timings above aren't of operations typical of daily use) * lower variance of times. If I have the time, I'll try to update the wiki--can anyone change the pages? Ross ---- Cyrus Home Page: http://cyrusimap.web.cmu.edu/ Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html
