Re: A quick fio test (was Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3)

Evgeniy Polyakov
2007-02-27T12:22:05Z

On Tue, Feb 27, 2007 at 12:29:08PM +0100, Jens Axboe (jens.axboe@oracle.com) wrote:
> On Tue, Feb 27 2007, Evgeniy Polyakov wrote:
> > My two coins:
> > # cat job
> > [global]
> > bs=8k
> > size=1g
> > direct=0
> > ioengine=sync
> > iodepth=32
> > rw=read
> >
> > [file]
> > filename=/home/user/test
> >
> > sync:
> > READ: io=1,024MiB, aggrb=39,329KiB/s, minb=39,329KiB/s,
> > maxb=39,329KiB/s, mint=27301msec, maxt=27301msec
> >
> > libaio:
> > READ: io=1,024MiB, aggrb=39,435KiB/s, minb=39,435KiB/s,
> > maxb=39,435KiB/s, mint=27228msec, maxt=27228msec
> >
> > syslet-rw:
> > READ: io=1,024MiB, aggrb=29,567KiB/s, minb=29,567KiB/s,
> > maxb=29,567KiB/s, mint=36315msec, maxt=36315msec
> >
> > During syslet-rw test about 9500 async schduledes happend.
> > I use fio-git-20070226150114.tar.gz
>
> That looks pretty pathetic :-). What IO scheduler did you use? syslets
> will confuse CFQ currently, so you want to compare with using eg
> deadline or as. That is one of the downsides of this approach.

Deadline shows this:

sync:
READ: io=1,024MiB, aggrb=38,212KiB/s, minb=38,212KiB/s,
maxb=38,212KiB/s, mint=28099msec, maxt=28099msec

libaio:
READ: io=1,024MiB, aggrb=37,933KiB/s, minb=37,933KiB/s,
maxb=37,933KiB/s, mint=28306msec, maxt=28306msec

syslet-rw:
READ: io=1,024MiB, aggrb=34,759KiB/s, minb=34,759KiB/s,
maxb=34,759KiB/s, mint=30891msec, maxt=30891msec

There were about 10k async schedulings.

--
Evgeniy Polyakov