[MITgcm-support] MPI problem on Archer (CRAY XC30)

[David Ferreira]

Hi Jean-Michel & Chris,
The coded modified by Jean-Michel fixed the problem.
I'm happy to test an even simpler “iarg1+iarg2” version (if provided !)

cheers,
david

On 10/21/14 3:44 AM, Chris Hill wrote:
> Hi David and Jean-Michel,
>
>   I am unsure why generate_tag doesn’t just do "iarg1+iarg2", but
> lets try Jean-Michels’s fix. Not sure who introduced the funky
> hash stuff in the first place. My recollection is that “iarg1+iarg2”
> should be all that are needed, but that code was a long time ago!
>
> Chris
>
> On Mon, Oct 20, 2014 at 10:29 PM, Jean-Michel Campin <jmc at ocean.mit.edu> wrote:
>> Hi David,
>>
>> Could you try to replace the original
>>   pkg/compon_communic/generate_tag.F
>> with the modified "generate_tag.F" routine (attached to this email)
>> and check that it works ?
>>
>> Cheers,
>> Jean-Michel
>>
>> On Mon, Oct 20, 2014 at 03:14:51PM +0100, David Ferreira wrote:
>>> Hi all,
>>> I'm having a problem running the coupled model on Archer.
>>> The Archer support team discovered the following problem:
>>>
>>> ##########
>>> ...
>>> ---
>>> Rank 0 [Tue Oct  7 22:44:10 2014] [c7-0c1s12n2] Fatal error in
>>> MPI_Recv: Invalid
>>> tag, error stack:
>>> MPI_Recv(192): MPI_Recv(buf=0x7fffffff8000, count=1024, MPI_INTEGER,
>>> src=1, tag=9862928,
>>>   comm=0x84000004, status=0x7fffffff7df0) failed
>>> MPI_Recv(113): Invalid tag, value is 9862928
>>> ---
>>>
>>> The maximum allowed value for the "tag" in MPI messages on Cray XC30 systems
>>> is 4194303, which explains the error message
>>>
>>> MPI_Recv(113): Invalid tag, value is 9862928
>>>
>>> The MPI standard only requires that the maximum tag value is not less than
>>> 32767 (so Cray MPI is compliant). The maximum can be larger, and can
>>> be found
>>> using the MPI_Get_attr enquiry function. Your program should
>>> retrieve this value
>>> and ensure that any tags it specifies are no larger.
>>>
>>> ##########
>>>
>>> I have absolutely no clue how to tell the model to choose MPI tags
>>> which are below 4194303.
>>> A bit of googling on MPI_Get_attr led me to some very obscure pages.
>>>
>>> Any help is welcome.
>>> Cheers,
>>> david
>>>
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>>> MITgcm-support at mitgcm.org
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