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

[Dan Jones]

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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