Ian Pilcher wrote: > > I need to quantify the additional CPU load that RAID-0 adds (vs. the > boost in I/O performance). I don't need to do anything fancy; > 'dd if=/dev/zero of=/dev/md?" should do the trick, but I'm not sure how > to track the processor utilization during the run. > > Any ideas? pericles:~ # sar -o /tmp/datafile 1 10000 & [1] 23533 pericles:~ # pericles:~ # while :; do /bin/true; done ^C pericles:~ # date Mon Mar 8 12:41:01 EST 2004 pericles:~ # kill %1 pericles:~ # sar -f /tmp/datafile Linux 2.6.3-rc2 (pericles) 03/08/04 12:39:08 CPU %user %nice %system %idle 12:39:10 all 0.00 0.00 0.50 99.50 12:40:26 all 1.76 0.00 2.81 95.43 12:40:27 all 0.00 0.00 0.99 99.01 12:40:38 all 20.70 0.00 33.64 45.66 12:40:39 all 0.00 0.00 0.99 99.01 12:40:55 all 0.06 0.00 0.06 99.88 12:40:57 all 0.00 0.00 0.00 100.00 12:40:58 all 15.00 0.00 24.00 61.00 12:40:59 all 39.00 0.00 61.00 0.00 12:41:00 all 40.00 0.00 60.00 0.00 12:41:01 all 0.00 0.00 1.00 99.00 12:41:02 all 0.99 0.00 0.99 98.02 12:41:03 all 0.00 0.00 0.00 100.00 12:41:05 all 0.00 0.00 0.00 100.00 12:41:07 all 0.00 0.00 0.00 100.00 Average: all 3.82 0.00 6.13 90.05 -- Paul - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
