[MITgcm-devel] Re: [MITgcm-cvs] MITgcm/tools/build_options CVS Commit

[David Ferreira]

Hi Dimitris,
We are looking into this. At this point, with -O3, "-fp-model precise" 
or "-mp"
is needed otherwise the models crashes (Chris tells me "-ftz" is 
included into "-mp").
Also, it turns out that the verification experiments with cube-sphere 
fail the restart
test with "-fp-model precise", but not with "-mp".
I'm running testreports with -O1/2/3, to see clarify a bit where it gets 
bad.
"-O3 -ftz" or even "-O2" could end up being good compromise.
david


Dimitris Menemenlis wrote:
> Would it be make sense to also remove "-fp-model precise",
> i.e., make the second line the default, and possibly add "-ftz", to
> linux_ia64_ifort+mpi_altix_nas ?
>
> As Chris discovered, the "-fp-model precise" slows down
> seaice_evp.F by a factor of ~50.
>
> D.
>
> On Sep 11, 2009, at 7:15 AM, David Ferreira wrote:
>
>> Update of /u/gcmpack/MITgcm/tools/build_options
>> In directory forge:/tmp/cvs-serv31895
>>
>> Modified Files:
>>     linux_ia64_ifort linux_ia64_ifort+mpi_altix_nas
>> Log Message:
>> Remove -r8 -i4, move -132 in its own flag
>>
>> _______________________________________________
>> MITgcm-cvs mailing list
>> MITgcm-cvs at mitgcm.org
>> http://mitgcm.org/mailman/listinfo/mitgcm-cvs
>
> _______________________________________________
> MITgcm-devel mailing list
> MITgcm-devel at mitgcm.org
> http://mitgcm.org/mailman/listinfo/mitgcm-devel