Messages in this thread | | | Date | Fri, 23 Feb 2007 22:43:48 +0530 | From | Suparna Bhattacharya <> | Subject | Re: A quick fio test (was Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3) |
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On Fri, Feb 23, 2007 at 05:25:08PM +0100, Jens Axboe wrote: > On Fri, Feb 23 2007, Suparna Bhattacharya wrote: > > On Fri, Feb 23, 2007 at 03:58:26PM +0100, Ingo Molnar wrote: > > > > > > * Suparna Bhattacharya <suparna@in.ibm.com> wrote: > > > > > > > As a really crude (and not very realistic) example of the potential > > > > impact of large numbers of outstanding IOs, I tried some quick direct > > > > IO comparisons using fio: > > > > > > > > [global] > > > > ioengine=syslet-rw > > > > buffered=0 > > > > rw=randread > > > > bs=64k > > > > size=1024m > > > > iodepth=64 > > > > > > could you please try those iodepth=20000 tests with the latest > > > fio-testing branch of fio as well? Jens wrote a new, smarter syslet > > > plugin for FIO. You'll need the v3 syslet kernel plus: > > > > > > git-clone git://git.kernel.dk/data/git/fio.git > > > cd fio > > > git-checkout syslet-testing > > > > > > my expectation is that it should behave better with iodepth=20000 > > > (although i havent tried that yet). > > > > I picked up the fio snapshot from 22nd Feb (fio-git-20070222212513.tar.gz) > > and used the v3 syslet patches from your web-site. > > > > Do I still need to get something more recent ? > > Yes, you need to test the syslet+testing branch that Ingo referenced. > Your test above is not totally fair right now, since you are doing > significantly less system calls with libaio. So to compare apples with > apples, try the syslet-testing branch. If you can't get it because of > firewall problems, check http://brick.kernel.dk/snaps/ for the latest > fio snapshot. If it has the syslet-testing branch, then that is > recent enough.
I have a feeling this is getting to be a little more bleeding edge than I had anticipated :), so will just hold off for a bit until this crystallizes a bit.
Regards Suparna
> > -- > Jens Axboe
-- Suparna Bhattacharya (suparna@in.ibm.com) Linux Technology Center IBM Software Lab, India
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