On Sat, 2009-07-18 at 16:39 +0200, Jens Axboe wrote: > On Sat, Jul 18 2009, Richard Kennedy wrote: > > Disk stats (read/write): > > dm-0: ios=3571/9894, merge=0/0, ticks=25884/31650, in_queue=511733, util=96.46%, aggrios=0/0, aggrmerge=0/0, aggrticks=0/0, aggrin_queue=0, aggrutil=0.00% > > If you look at the disk stats, it also shows a considerable amount of > reads. So I'm guessing that you need pre_read=1 to get the same sort of > results. > thanks for that. Yes, pre_read is much better. fio --name=f1 --rw=write --size=300m --pre_read=1 write: io=300MiB, bw=274MiB/s, iops=70,265, runt= 1093msec fio --name=f1 --rw=write --size=300m --pre_read=1 --ioengine=mmap write: io=300MiB, bw=391MiB/s, iops=100K, runt= 767msec fio --name=f1 --rw=write --size=300m --ioengine=mmap write: io=300MiB, bw=30,837KiB/s, iops=7,709, runt= 9962msec regards Richard -- To unsubscribe from this list: send the line "unsubscribe fio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
