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

[David Ferreira]

Dimitri,
>> Has anyone actually tested that "-fp-model precise -ftz" breaks the restart?
>>      
   Looks like you've missed my e-mail:  "-fp-model precise -ftz" does 
break the restart.
So I think we should get back to the old version of the optfile.
>> If noone has tested restarts with "-fp-model precise -ftz", I can put it on my todo list.
>>      
If you really want to do this kind of test, I suggest doing it with a 
newer version of ifort
than intel-comp.10.1.013 (because on pleiades with ifort.11, there is no 
need for "-mp").
So hopefully the problem disappears by itself with higher versions ....
david





>> Dimitris
>>
>> On Apr 26, 2010, at 8:41 AM, Constantinos Evangelinos wrote:
>>
>>      
>>> On Saturday 24 April 2010 07:42:55 pm Jean-Michel Campin wrote:
>>>        
>>>> Hi Dimitris,
>>>>
>>>> I think that if your modified optfile degrade the results of
>>>> the 2+2 test, it's better to go back and leave the new option
>>>> commented: the reason is that it's quiet nice to be able
>>>> to restart exactly, and if it's no longer the case, it could
>>>> disturb other users. I personally don't run the 2+2 test very
>>>> often (apart from the standard verification tests), and it might
>>>> take them some time to realize that they lost this capability.
>>>>          
>>> So essentially we have an option (-mp) that works but is not going to be there
>>> in the Intel 12.0 compilers while its suggested equivalent option (-fp-model
>>> precise) is producing underflows in the EVP solver slowing it down immensely
>>> and at the same time a modification to -fp-model precise to avoid the
>>> underflows (-ftz) breaks the restart... What a mess.
>>>
>>> Constantinos
>>>        
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