Re: Group reporting with latency and IOPS

[Jens Axboe <axboe@kernel.dk>]

On Tue, Jan 29 2013, Neto, Antonio Jose Rodrigues wrote:
> On Tue, Jan 29 2013, Neto, Antonio Jose Rodrigues wrote:
> > atency: (clat) 577usecs - 0.577ms
> > >
> > >Correct too.
> > >
> > >> Am I doing the correct analysis?
> > >
> > >Yep.
> > >
> > >> One question is: Is it possible to have global IOPS and latency?
> > >
> > >You mean for both read and write combined? Fio does not report that, 
> > >but for IOPS you could just add them. For latency, the larger of the two.
> > >
> > >--=20
> > >Jens Axboe
> > >
> > 
> > Hi Jens
> > 
> > This is neto from Brazil
> > 
> > How are you?
> > 
> > Thank you so much for your answer.
> > 
> > How can I have a combined IOPS reported?
> 
> You can't, at least not automatically. You would have to sum them up. It would not be hard to add at all, though, controlled by an option. I haven't had any requests for it before now, usually people ask for more fine grained metrics, not the other way around :-)
> 
> --
> Jens Axboe
> 
> Thank you Jens, I understand. To have an option to group everything
> could be a good thing especially when you are doing a POC or
> demonstrating performance for a customer where they are interested in
> how many IOPS and total latency :-) 

I agree, I can see the use case. I'll add a 'unified_rw_reporting'
option to be able to do that. Most accounting is done collectively, so
it should be pretty simple to do this.

-- 
Jens Axboe