[MITgcm-support] MITgcm-support Digest, Vol 162, Issue 18
Dan Jones
dcjones.work at gmail.com
Wed Dec 21 04:14:30 EST 2016
Hi Gael,
Thanks, that worked perfectly. So when using exch2, halving sNx or sNy does
*not* necessarily double nprocs. That's where I went wrong. This is
different from MITgcm's standard domain decomposition process. Thanks for
the clarification!
Best,
Dan
On Mon, Dec 19, 2016 at 5:00 PM, <mitgcm-support-request at mitgcm.org> wrote:
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> 1. Re: Changing the number of cores in ECCOv4 (gael forget)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 19 Dec 2016 10:40:46 -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: <F3E9C83D-37FC-4373-BF73-1FC272CAC5C8 at mit.edu>
> Content-Type: text/plain; charset="us-ascii"
>
> Hi Dan,
> please try sNx=sNy=15, nPx=360, and nPy=1 which should give
> SIZE.h+blankList=360+108=468=4*117
> Cheers,
> Gael
>
>
> On Dec 17, 2016, at 4:18 AM, Dan Jones <dcjones.work at gmail.com> wrote:
>
> > Hi Gael,
> >
> > As I mentioned, the nprocs=192 case is working, but I am having trouble
> with the nprocs=384 case. In SIZE.h, I set sNx=sNy=15, nPx=192, and
> nPy=2. In data.exch2, I uncommented the 'blankList' entry for the 15x15
> case:
> >
> > http://wwwcvs.mitgcm.org/viewvc/MITgcm/MITgcm_contrib/
> gael/verification/ECCO_v4_r2/input/data.exch2?view=markup
> >
> > (BTW, the comment for the 15x15 case lists nprocs=360 - is that a typo,
> or have I missed something obvious? I guess it should be nprocs=384.)
> >
> > Here's the run-time error:
> > STOP ABNORMAL END: S/R W2_SET_MAP_TILES
> >
> > (PID.TID 0000.0001) *** ERROR *** W2_SET_MAP_TILES: Domain Total # of
> tiles = 468 does
> >
> >
> > (PID.TID 0000.0001) *** ERROR *** W2_SET_MAP_TILES: not match
> (SIZE.h+blankList)= 492
> >
> > What am I missing? Thanks again for the help.
> >
> > Best,
> > Dan
> >
> >
> > On Thu, Dec 15, 2016 at 5:00 PM, <mitgcm-support-request at mitgcm.org>
> wrote:
> > Send MITgcm-support mailing list submissions to
> > mitgcm-support at mitgcm.org
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> > When replying, please edit your Subject line so it is more specific
> > than "Re: Contents of MITgcm-support digest..."
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> > Today's Topics:
> >
> > 1. Changing the number of cores in ECCOv4 (Dan Jones)
> > 2. Re: Changing the number of cores in ECCOv4 (gael forget)
> >
> >
> > ----------------------------------------------------------------------
> >
> > Message: 1
> > Date: Thu, 15 Dec 2016 13:02:51 +0000
> > From: Dan Jones <dcjones.work at gmail.com>
> > To: mitgcm-support at mitgcm.org
> > Subject: [MITgcm-support] Changing the number of cores in ECCOv4
> > Message-ID:
> > <CAPj3iHTghBD9xBXdg3JToTFk3NkqTaq61ZNS8eYqJQxgbSrbRQ at mail.
> gmail.com>
> > Content-Type: text/plain; charset="utf-8"
> >
> > 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
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> > ------------------------------
> >
> > 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
> > > _______________________________________________
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> > > MITgcm-support at mitgcm.org
> > > http://mitgcm.org/mailman/listinfo/mitgcm-support
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