search for: fsuser3

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2009 Nov 18
0
open(2), but no I/O to large files creates performance hit
...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 other 5 run in 5.5 hours(...