Hi, does anyone have any ideas about this ramp_time behavior? On Tue, May 20, 2014 at 10:13 AM, Devon Yablonski <dmyablonski@xxxxxxxxx> wrote: > Hi, I'm using fio 2.1.7 and I have the following fio configuration: > > #FIO CONFIGURATION > [globals] > name=fio_write > rw=write > size=5G > ioengine=libaio > direct=1 > unlink=0 > bs=4096 > iodepth=128 > scramble_buffers=1 > group_reporting > gtod_reduce=0 > norandommap > thread > randrepeat=0 > ramp_time=0s > random_generator=tausworthe > > [thread 0] > filename=/dev/md0 > > My result shows: > /fio fioc.cfg > fio_write: (g=0): rw=write, bs=4K-4K/4K-4K/4K-4K, ioengine=libaio, iodepth=128 > fio-2.1.7 > Starting 1 thread > Jobs: 1 (f=1): [W] [100.0% done] [0KB/799.8MB/0KB /s] [0/205K/0 iops] > [eta 00m:00s] > fio_write: (groupid=0, jobs=1): err= 0: pid=13889: Mon May 19 15:29:55 2014 > write: io=5120.0MB, bw=821510KB/s, iops=205377, runt= 6382msec > <snip> > Run status group 0 (all jobs): > WRITE: io=5120.0MB, aggrb=821510KB/s, minb=821510KB/s, > maxb=821510KB/s, mint=6382msec, maxt=6382msec > > Note that the runtime was about 6 seconds. > > If I change the ramp_time to 1s (ramp_time=1s) the test runs for 12-13 > seconds (about 2x) and writes much more data than size: > > fio_write: (g=0): rw=write, bs=4K-4K/4K-4K/4K-4K, ioengine=libaio, iodepth=128 > fio-2.1.7 > Starting 1 thread > Jobs: 1 (f=1): [W] [100.0% done] [0KB/626.1MB/0KB /s] [0/160K/0 iops] > [eta 00m:00s] > fio_write: (groupid=0, jobs=1): err= 0: pid=15860: Tue May 20 08:28:35 2014 > write: io=9406.3MB, bw=717344KB/s, iops=179326, runt= 13427msec > <snip> > Run status group 0 (all jobs): > WRITE: io=9406.3MB, aggrb=717343KB/s, minb=717343KB/s, > maxb=717343KB/s, mint=13427msec, maxt=13427msec > > The time remaining counts down to 0 and then the test keeps running - > it seems like the test may be running a second iteration. What am I > doing incorrectly? > > Thanks, > Devon -- 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
