Re: [Starpu-devel] Suggestions about creating starpu threads

[Andra Hugo <andra.hugo@inria.fr>]

Hi Fangli,

Thank you! Yes will take a look!

Best,
Andra

----- Mail original -----
> De: "Fangli Pi" <hpcfapix@hlrs.de>
> À: "Andra Hugo" <andra.hugo@inria.fr>
> Cc: "Samuel Thibault" <samuel.thibault@inria.fr>, "starpu-devel" 
> <starpu-devel@lists.gforge.inria.fr>
> Envoyé: Jeudi 16 Juin 2016 16:19:01
> Objet: Re: Suggestions about creating starpu threads
> 
> Hi Andra,
> 
> During these two weeks I have updated my starpu extension part according to
> the reviews from you and Samuel and a preliminary assessment about our
> monitoring client-server communication's overhead is done.
> 
> Please check these updates in the following repo:
> http://gitlab.excess-project.eu/hpcfapix/starpu-ex-1-2-0rc5
> 
> There is one clarification file "EX_ChangLog.md" with more details and a
> figure showing the assessment result.
> 
> Please feel free to contact me in case of any possible comments.
> 
> Best regards,
> Fangli
> 
> ----- Original Message -----
> From: "Andra Hugo" <andra.hugo@inria.fr>
> To: "Fangli Pi" <hpcfapix@hlrs.de>
> Cc: "Samuel Thibault" <samuel.thibault@inria.fr>, "starpu-devel"
> <starpu-devel@lists.gforge.inria.fr>
> Sent: Monday, May 30, 2016 10:12:30 AM
> Subject: Re: Suggestions about creating starpu threads
> 
> Hi,
> 
> That sounds good!
> 
> Andra
> 
> ----- Mail original -----
> > De: "Fangli Pi" <hpcfapix@hlrs.de>
> > À: "Andra Hugo" <andra.hugo@inria.fr>, "Samuel Thibault"
> > <samuel.thibault@inria.fr>
> > Cc: "starpu-devel" <starpu-devel@lists.gforge.inria.fr>
> > Envoyé: Lundi 30 Mai 2016 09:04:22
> > Objet: Re: Suggestions about creating starpu threads
> > 
> > Hi,
> > 
> > Sorry for the delay of reply.
> > 
> > Fangli
> > 
> > ----- Original Message -----
> > From: "Andra Hugo" <andra.hugo@inria.fr>
> > To: "Fangli Pi" <hpcfapix@hlrs.de>
> > Cc: "starpu-devel" <starpu-devel@lists.gforge.inria.fr>, "Samuel Thibault"
> > <samuel.thibault@inria.fr>
> > Sent: Wednesday, May 25, 2016 6:46:11 PM
> > Subject: Re: Suggestions about creating starpu threads
> > 
> > Hi,
> > 
> > Yes indeed we should first measure if this is actually a problem before
> > going
> > into unnecessary modifications.
> > 
> > Sure, I will try to do the assessment of the effect on performance.
> > 
> > Of course as long as we use the tools just for training it should not be a
> > problem. However, as far as I know RAPL bases their values on a model 
> > (IPC,
> > cache misses, frequency etc.) they don't do actual hardware measurement of
> > the voltage. So as Sam says, depending on what we executed before hand the
> > frequency may change and affect the measurements. But I suppose this can
> > happen anyway. Do you do any approximations for this?
> > 
> > Right now I don't have any approximations according to the frequency
> > change,
> > but I can have a look at it and try if it is possible.
> > 
> > So these measurements should be desactivated if STARPU_CALIBRATE = 0,
> > right?
> > 
> > According to one of your reviews, I have added one environment to activate
> > and deactivate the power measurements, named as STARPU_POWER_PROFILING,
> > which determines if ex_starpu_init() is called or not.
> >  
> > Andra
> > 
> > > ----- Mail original -----
> > > > De: "Samuel Thibault" <samuel.thibault@inria.fr>
> > > > À: "Fangli Pi" <hpcfapix@hlrs.de>
> > > > Cc: "Andra Hugo" <andra.hugo@inria.fr>, "starpu-devel"
> > > > <starpu-devel@lists.gforge.inria.fr>
> > > > Envoyé: Mercredi 25 Mai 2016 16:33:42
> > > > Objet: Re: Suggestions about creating starpu threads
> > > > 
> > > > Fangli Pi, on Wed 25 May 2016 16:30:23 +0200, wrote:
> > > > > After all, the performance during training is not so important,
> > > > > right?
> > > > 
> > > > Hurting the performance of the application is not very important
> > > > indeed,
> > > > as long as the performance of the tasks is preserved.
> > > > 
> > > > That said, if it really hurts the performance of the application, that
> > > > could potentially change the energy consumption. If it's not too bad
> > > > it's fine, but it'd be useful to assess it.
> > > > 
> > > > Samuel
> > > > 
> > >
> > --
> > High Performance Computing Center (HLRS)
> > University of Stuttgart
> > Nobelstr. 19
> > D-70569 Stuttgart, Germany
> > 
> > phone: ++49-711-685-60442
> >
> --
> High Performance Computing Center (HLRS)
> University of Stuttgart
> Nobelstr. 19
> D-70569 Stuttgart, Germany
> 
> phone: ++49-711-685-60442
>