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fsuser
2009 Nov 18
0
open(2), but no I/O to large files creates performance hit
...ed with dtrace, that no I/O is done
to the original file that is to be overwritten.
If the files don''t exist (or if zfs_prefetch_disable is set to true),
the times for each of the 8 jobs looks similar to this (all jobs run in
less than 5 hours):
# ../get-times.sh
FSUSER1.log:4:50:31.21
FSUSER2.log:4:51:09.99
FSUSER3.log:4:49:35.22
FSUSER4.log:4:50:31.05
FSUSER5.log:4:50:30.11
FSUSER6.log:4:50:29.51
FSUSER7.log:4:49:35.22
FSUSER8.log:4:51:08.53
If the output files exist (and I don''t touch zfs_prefetch_disable), the
times look like this (3/8 jobs run in less than 5 hrs, the oth...