[MITgcm-support] Changing the number of cores in ECCOv4 (gael forget)

[gael forget]

Hi Dan,
sounds correct. How did this work out? I would be curious to know how linearly the computation scales up 
on the machine you are using — what kind of wall clock times did you get with 96, 192, and 360 cores?
Cheers,
Gael

On Dec 17, 2016, at 2:14 AM, Dan Jones <dcjones.work at gmail.com> wrote:

> Hi Gael,
> 
> Great! That worked perfectly, thanks.
> 
> For nprocs=384, I guess sNx=sNy=15, nPx=192, and nPy=2 in SIZE.h, and the "blanklist" line for 384 should be commented out in data.exch2.  (I've got a test run with this configuration sitting on the queue.)
> 
> Thanks!
> Dan
> 
> On Thu, Dec 15, 2016 at 5:00 PM, <mitgcm-support-request at mitgcm.org> wrote:
> 
> ------------------------------
> 
> Message: 2
> Date: Thu, 15 Dec 2016 09:34:16 -0500
> From: gael forget <gforget at mit.edu>
> To: mitgcm-support at mitgcm.org
> Subject: Re: [MITgcm-support] Changing the number of cores in ECCOv4
> Message-ID: <6F89820D-9735-41AD-9790-98704EAC2510 at mit.edu>
> Content-Type: text/plain; charset="windows-1252"
> 
> Hi Dan,
> you seem to be on the right track. Unless I forget something all you want to do is indeed
> - change sNx & nPx jointly, e.g., to make them 15 & 192 in http://wwwcvs.mitgcm.org/viewvc/MITgcm/MITgcm_contrib/gael/verification/ECCO_v4_r2/code/SIZE.h?view=markup
> - uncomment the 'blankList? line for nprocs=192 and comment out the one for nprocs=96 in http://wwwcvs.mitgcm.org/viewvc/MITgcm/MITgcm_contrib/gael/verification/ECCO_v4_r2/input/data.exch2?view=markup
> Cheers,
> Gael
> 
> 
> 
> 
> On Dec 15, 2016, at 8:02 AM, Dan Jones <dcjones.work at gmail.com> wrote:
> 
> > Hi all,
> >
> > I'm running ECCOv4, and I would like to double the number of cores.  I haven't used exch2 before, so I'm not sure how to do that.
> >
> > I've read this discussion thread:
> > http://mitgcm.org/pipermail/mitgcm-support/2014-December/009660.html
> >
> > So I believe that I should set nPx=192 in SIZE.h, but I'm not sure what else needs to be changed.  I'm used to conserving the total number of grid points (by changing sNx and sNy), but I'm not sure how exch2 handles that.
> >
> > I'm also not sure what to do in data.exch2.  I've uncommented the 'blankList' for nprocs=192 and commented out the 'blankList' for nprocs=96.  Is there anything else?
> >
> > Thanks in advance, exch2 experts!
> >
> > -Dan
> > _______________________________________________
> > MITgcm-support mailing list
> > MITgcm-support at mitgcm.org
> > http://mitgcm.org/mailman/listinfo/mitgcm-support
> 
> 
> 
> End of MITgcm-support Digest, Vol 162, Issue 11
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