[PVFS2-developers] metadata record pre-allocation

[Nathan Poznick]

Thus spake Nathan Poznick:
> 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)

Since the default journaling mode is data=ordered, here are the results
when using:

data=journal,
fsync timed at 48.318 msec (average: 48.318 msec per file)
close of 30 files timed at 73.366 msec (avg: 2445.53 usec)
sync timed at 1219.89 msec (average: 40.6631 msec per file)
close of 30 files timed at 83.135 msec (avg: 2771.17 usec)

data=writeback,
fsync timed at 11.33 msec (average: 11.33 msec per file)
close of 30 files timed at 88.018 msec (avg: 2933.93 usec)
sync timed at 1335.97 msec (average: 44.5324 msec per file)
close of 30 files timed at 80.384 msec (avg: 2679.47 usec)

So, it appears only data=ordered (the default) has this problem...

-- 
Nathan Poznick <poznick at conwaycorp.net>

"What do you want from us?? We're *evil*! EVIL!!" -Dr. Forrester and
TV's Frank. #301

-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 189 bytes
Desc: Digital signature
Url : http://www.beowulf-underground.org/pipermail/pvfs2-developers/attachments/20040727/c19cb56a/attachment.bin