Re: fio-1.34.1, what we are doing with it and some patches we use.

[Jens Axboe <jens.axboe@oracle.com>]

On Sat, Oct 31 2009, Jens Axboe wrote:
> On Fri, Oct 30 2009, Glen Ogilvie wrote:
> > Dear Jens Axboe and the FIO mailing list.
> > 
> > I have been working with Mike O'Sullivan, a senior lecturer at the
> > University of Auckland, New Zealand. He has been adapting fio 1.34.1
> > to work with iolog files and also to be able to read a "wait" command
> > to allow the iolog file to specify a wait (in millisecs) before the
> > next io. Mike's not completely confident that his changes are correct
> > in the overall fio picture, but they are working with the iolog files
> > we are using. What we did:
> > 
> > 1) We incorporated wait into iolog file reading; 2) We made some
> > modifications so that read_iolog worked.
> > 
> > We have attached a patch for fio-1.34.1.tar.bz2 along with some
> > demonstration fio config files and iolog files.
> > 
> > We are doing this so we can use an open source SPC-1 emulator to
> > generate SPC-1 like workloads and then run them in fio.
> > 
> > Hope some of this work is useful.   Feed back is welcome, we are not
> > experts in FIO and SPC-1, so this may have problems.
> 
> Interesting! I think the patch you attached is reversed, you want to
> diff old tree -> new tree. Otherwise the patch looks nice and simple,
> one of the hunks look like a generic bug fix for leaking memory and
> probably should be applied first as it isn't really part of this
> "feature".
> 
> Another thing to keep in mind is the format of the iolog file. Did you
> check whether the old versions just ignore the 'wait' line? If yes, we
> can keep the format. Otherwise we probably need to bump it.

I fixed up the style and committed it, thanks a lot for contributing
this!

-- 
Jens Axboe