[PVFS2-developers] metadata record pre-allocation

Nathan Poznick poznick at conwaycorp.net
Tue Jul 27 18:50:10 EDT 2004


I accidently didn't reply to the list...

----- Forwarded message from Nathan Poznick <poznick at conwaycorp.net> -----

From: Nathan Poznick <poznick at conwaycorp.net>
To: Murali Vilayannur <vilayann at mcs.anl.gov>
Subject: Re: [PVFS2-developers] metadata record pre-allocation
Date: Tue, 27 Jul 2004 17:16:18 -0500

Thus spake Murali Vilayannur:
> It would be interesting to see if anyone finds similar behavior on say 
> jfs, reiserfs4, xfs and so on..

Ask and ye shall receive (partly, at least).  All results generated on
an SLES 9rc2 system with a hardware RAID0 set underlying the filesystem.
Pay special attention to the difference between ext3 and ext2.

On jfs,
fsync timed at 0.863 msec (average: 0.863 msec per file)
close of 30 files timed at 1.209 msec (avg: 40.3 usec)
sync timed at 1806.15 msec (average: 60.2051 msec per file)
close of 30 files timed at 1.101 msec (avg: 36.7 usec)

On xfs,
fsync timed at 7.263 msec (average: 7.263 msec per file)
close of 30 files timed at 68.057 msec (avg: 2268.57 usec)
sync timed at 1480.2 msec (average: 49.3399 msec per file)
close of 30 files timed at 65.463 msec (avg: 2182.1 usec)

On reiserfs,
fsync timed at 991.668 msec (average: 991.668 msec per file)
close of 30 files timed at 117.205 msec (avg: 3906.83 usec)
sync timed at 2155.65 msec (average: 71.855 msec per file)
close of 30 files timed at 104.933 msec (avg: 3497.77 usec)

On ext3,
fsync timed at 1401.79 msec (average: 1401.79 msec per file)
close of 30 files timed at 81.371 msec (avg: 2712.37 usec)
sync timed at 1360.37 msec (average: 45.3458 msec per file)
close of 30 files timed at 82.235 msec (avg: 2741.17 usec)

On ext2,
fsync timed at 10.381 msec (average: 10.381 msec per file)
close of 30 files timed at 67.339 msec (avg: 2244.63 usec)
sync timed at 1296.02 msec (average: 43.2007 msec per file)
close of 30 files timed at 90.673 msec (avg: 3022.43 usec)



-- 
Nathan Poznick <poznick at conwaycorp.net>

Common sense is only a modification of talent. Genius is an exaltation
of it. The difference is, therefore, in degree, not nature. - Edward G.
Bulwer-Lytton




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