[MITgcm-devel] linux_amd64_ifort+mpi_ice_nas update

[Menemenlis, Dimitris (3248)]

OK.

David, will you check in change to linux_amd64_ifort+mpi_ice_nas
or do you want me to do so?

I will start using updated optfile for the hi-res llc simulations
and report if I run into any trouble.

Cheers

Dimitris Menemenlis

On Oct 21, 2013, at 6:15 PM, Jean-Michel Campin wrote:

> Hi Dimitris,
> 
> I would vote for the conservative approach, to just change 
> NOOPTFLAGS to '-O1 -fp-model precise'
> and keep seaice_growth.F in the NOOPTFILES list.
> We don't need -fPIC twice (in FFLAGS and NOOPTFLAGS), so no need 
> to keep it in NOOPTFLAGS setting.
> 
> Just to finish with few tests with ifort (v13) on acesgrid:
> a) As I mentionned earlier, with -fast (see e.g.:
> http://mitgcm.org/testing/results/2013_10/tr_acesgrid-ifc_20131020_0/summary.txt
> ) there are few "FAIL" with low level of agreement and, in addition,
> the restart test fails for all the cubed-sphere and many Non-hydrostatic 
> experiments:
> http://mitgcm.org/testing/results/2013_10/rs_acesgrid-ifc_20131020_0/summary.txt
> 
> b) It get better if I change from -O2 to -O1, but still most of 
> the cubed-sphere restart tests fail.
> 
> c) If I jsut set: FOPTIM="-O1 -align -ip -fp-model precise -xHost"
> then the testreport output + the restart are all good, and identical 
> to the default (-ieee) results.
> 
> d) by putting back -O2 so that:
> FOPTIM="-O2 -align -ip -fp-model precise -xHost"
> all the restart tests pass, little changes in testreport output 
> compared to (c) except for global_with_exf.yearly (fail @ 6)
> and few little changes in lab_sea & seaice_obcs (but for 
> lab_sea.salt_plume and seaice_obcs the agreement with ref output 
> is even better than it was in (c)).
> 
> e) finally, replacing "-fp-model precise" with "-fp-model source"
> does not change anything.
> 
> And since I think it's better to have working restart, I think I will 
> change the optfile "linux_amd64_ifort11" to what I tried in (d).
> The problem with global_with_exf.yearly might be related to a wrong
> compiler optimisation (vectorisation type) of one source file; 
> but it takes time to figure out which one, and this might depend on 
> the compiler & mpi version.
> 
> Cheers,
> Jean-Michel
> 
> On Mon, Oct 21, 2013 at 05:37:55PM +0000, Menemenlis, Dimitris (3248) wrote:
>> David thanks for testing.  So what next?
>> We switch to "NOOPTFLAGS='-O1 -fPIC'" and let folks give try it in bigger configs?
>> Or do we try to push for even more aggressive optimization?
>> 
>> Dimitris Menemenlis
>> 
>> On Oct 21, 2013, at 10:32 AM, David Ferreira wrote:
>> 
>>> Jean-Michel, Dimitris,
>>> The testreports of global_ocean.cs32x15, lab_sea, offline_exf_seaice, seaice_itd, and seaice_obcs with NOOPTFLAGS=-O1 (with -noieee) give the same results as with -O0.
>>> So nothing special at this level.
>>> david
>> 
>> 
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