[MITgcm-support] convincing compiler of node memory size

[Holly Dail]

Yikes -- I was just promising David yesterday I would read opt files  
more often ... so sorry I missed this down at the bottom.

Thanks Martin and Oliver -
Holly

On Apr 15, 2010, at Apr 15 , 11:21 AM, Oliver Jahn wrote:

> Hi Holly,
>
> the current optfile has the correct options for big executable at  
> the end (commented out):
>
> http://mitgcm.org/viewvc/MITgcm/MITgcm/tools/build_options/linux_amd64_ifort%2Bmpi_ice_nas?hideattic=0&revision=1.1&view=markup
>
> #- For really big executable (> 2 GB), uncomment following 2 lines
> #FFLAGS="$FFLAGS -mcmodel medium -shared-intel"
> #CFLAGS='-mcmodel medium'
>
> Oliver
>
>
> On 04/15/2010 11:14 AM, Martin Losch wrote:
>> Hi Holly,
>>
>> usually the default "memory model" only allows access to 2GB of  
>> RAM. Look for a flag that lets you change the memory model to  
>> something like "medium" (for pgf compilers I once used - 
>> mc_mode=medium, if I remember correctly).
>>
>> Martin
>>
>> On Apr 15, 2010, at 5:00 PM, Holly Dail wrote:
>>
>>> Hello all -
>>>
>>> I'm trying to build an adjoint code for the Nehalem nodes on  
>>> Pleiades, and am getting the same error reported in January by  
>>> Santha here:
>>> http://mitgcm.org/pipermail/mitgcm-support/2010-January/006434.html
>>>
>>> Reducing my nchklev_1 does allow a successful compile, but I don't  
>>> seem to be able to generate a binary that uses anywhere close to  
>>> the 3 GB available on the Nehalem nodes.  In my config, if I use  
>>> nchklev_1 = 30 I get a binary that uses nearly 1 GB, but if I set  
>>> nchklev_1 = 80 the link fails.
>>>
>>> The head nodes have 4 GB of memory, but perhaps there is a setting  
>>> somewhere telling the compiler 1 GB is the maximum?  I imagine I  
>>> could submit the compile to the queue, but is there another  
>>> solution?
>>>
>>> I'm using linux_ia64_ifort+mpi_ice_nas with -xSSE4.2.
>>>
>>> Thanks -
>>> Holly
>>>
>>> _______________________________________________
>>> MITgcm-support mailing list
>>> MITgcm-support at mitgcm.org
>>> http://mitgcm.org/mailman/listinfo/mitgcm-support
>>
>>
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