[dcmf] 32-bit ROMIO: What is the best solution?

Thu Feb 28 13:29:31 CST 2008

Let's just use mpich2-bg. -- Rob

On Feb 28, 2008, at 1:26 PM, Rajeev Thakur wrote:

> Perhaps we could use mpich2-bg for private communication between the  
> IBM
> folks and Argonne MPICH2 developers, and mpich2-dev for stuff meant  
> for
> others. mpich2-dev has many subscribers.
>
> Rajeev
>
>
>> -----Original Message-----
>> From: dcmf-bounces at lists.anl-external.org
>> [mailto:dcmf-bounces at lists.anl-external.org] On Behalf Of Rob Ross
>> Sent: Thursday, February 28, 2008 12:56 PM
>> To: Pavan Balaji
>> Cc: dcmf at lists.anl-external.org; dcmf-bounces at lists.anl-external.org
>> Subject: Re: [dcmf] 32-bit ROMIO: What is the best solution?
>>
>> That's fine with me too. Michael, please provide us a list of
>> interested IBM parties, and we'll get this set up.
>>
>> Pavan, can you put RobL, Kevin, Sam, and I on the mpich2-bg list
>> (along with Rajeev and others on the MPICH team as appropriate)?
>>
>> Thanks,
>>
>> Rob
>>
>> On Feb 28, 2008, at 12:42 PM, Pavan Balaji wrote:
>>
>>>
>>> There's an mpich2-bg list that I just created if you want to move
>>> there.
>>>
>>> -- Pavan
>>>
>>> On 02/28/2008 12:39 PM, Rob Ross wrote:
>>>> Rajeev had suggested this too. Let's go with mpich2-dev. Can you
>>>> give us a list of people that should be added to the list?
>>>> Thanks,
>>>> Rob
>>>> On Feb 28, 2008, at 12:29 PM, Michael Blocksome wrote:
>>>>>
>>>>> I agree .. we need to get over the discussion about the
>> discussion
>>>>> as fast as possible. :)
>>>>>
>>>>> The dcmf list has worked well, but I think we started using it
>>>>> because there were no alternatives to the issue at hand.  Given
>>>>> that the mpich2 and global arrays communities have different
>>>>> licenses, our long term direction for the dcmf community
>> should be
>>>>> to support the dcmf library and move discussion of other
>>>>> "external" libraries (like mpich2 and global arrays) into thier
>>>>> communities.
>>>>>
>>>>> I just noticed that there is a mpich2-dev at mcs.anl.gov
>> mailing list
>>>>> already set up.  Could we use this list to collaborate on the
>>>>> mpich2 implementation?
>>>>>
>>>>> Michael Blocksome
>>>>> Blue Gene Messaging Team Lead
>>>>> Advanced Systems SW Development
>>>>> blocksom at us.ibm.com
>>>>>
>>>>>
>>>>> Rob Ross <rross at mcs.anl.gov> wrote on 02/28/2008 12:17:06 PM:
>>>>>
>>>>>> Hi,
>>>>>>
>>>>>> We've been using the DCMF list for all sorts of things
>> that aren't
>>>>>> directly related to DCMF without any issues (as far as
>> I know);
>>>>> it has
>>>>>> become the successful technical communication path between IBM
>>>>> and ANL
>>>>>> so far.
>>>>>>
>>>>>> However, if you'd like to create a separate list for
>> discussing
>>>>> this,
>>>>>> we can do that. Is that what you would like to do? If so, can
>>>>> you give
>>>>>> us a list of people on the IBM side that should be on the new
>>>>> list?
>>>>>> I'd like to be done discussing where we're going to talk about
>>>>> this
>>>>>> issue ASAP and concentrate on fixing it.
>>>>>>
>>>>>> Thanks,
>>>>>>
>>>>>> Rob
>>>>>>
>>>>>> On Feb 28, 2008, at 11:18 AM, Michael Blocksome wrote:
>>>>>>
>>>>>>>
>>>>>>> Unfortunately, this MPI_Aint discussion really has
>> nothing to do
>>>>>>> with DCMF.  The entrire problem and solution is with MPICH2.
>>>>>>>
>>>>>>> Is there another, less broad, mpich mailing list that
>> we could
>>>>> use?
>>>>>>> Maybe a "mpich-development" or something like that?
>>>>>>>
>>>>>>> Michael Blocksome
>>>>>>> Blue Gene Messaging Team Lead
>>>>>>> Advanced Systems SW Development
>>>>>>> blocksom at us.ibm.com
>>>>>>>
>>>>>>>
>>>>>>> dcmf-bounces at lists.anl-external.org wrote on 02/28/2008
>>>>> 11:01:09 AM:
>>>>>>>
>>>>>>>> I'd say this mailing list is better for it right now.
>>>>> Posting on the
>>>>>>>> broader mpich-discuss might just distract us.
>>>>>>>>
>>>>>>>> Rajeev
>>>>>>>>
>>>>>>>> From: dcmf-bounces at lists.anl-external.org [mailto:dcmf-
>>>>>>>> bounces at lists.anl-external.org] On Behalf Of Bob Cernohous
>>>>>>>> Sent: Wednesday, February 27, 2008 4:19 PM
>>>>>>>> To: dcmf at lists.anl-external.org
>>>>>>>> Subject: Re: [dcmf] 32-bit ROMIO: What is the best solution?
>>>>>>>
>>>>>>>>
>>>>>>>> bobc at us.ibm.com wrote on 02/08/2008 02:41:40 PM:
>>>>>>>>
>>>>>>>>> We all realize there are issues with MPI_Aint's in 32 bit
>>>>>>> implementations.
>>>>>>>>> Using signed 32 bit addresses along with 64 bit offsets can
>>>>>>> result in
>>>>>>>>> some pretty broken code.  I've reproduced several
>> problems on
>>>>>>>>> BGL/BGP/linux.   The problems are most obvious with romio
>>>>> files >
>>>>>>> 2G or
>>>>>>>>> virtual addresses > 2G.
>>>>>>>>
>>>>>>>> Earlier this month I posted some comments to this mailing
>>>>> list about
>>>>>>>> 32-bit MPICH/ROMIO/MPI_Aint issues (see above and the
>>>>> archive).
>>>>>>>>
>>>>>>>> We've started to work on the problem.   We're (optionally)
>>>>> making
>>>>>>>> MPI_Aint a 64 bit signed value even when integers/pointers
>>>>> are 32
>>>>>>> bit
>>>>>>>> values.
>>>>>>>>
>>>>>>>> We'd like to start sending fix patches to the
>> community for
>>>>> comment.
>>>>>>>>
>>>>>>>> However, since we are (in parallel) contributing our BGP
>>>>> code back
>>>>>>>> to MPICH and trying to converge on a common code base of
>>>>> 1.0.7,
>>>>>>>> and because this problem applies to any 32-bit platform,
>>>>>>>> we thought we should move the discussion to
>> mpich-discuss to
>>>>> get
>>>>>>>> the larger community's comments.
>>>>>>>>
>>>>>>>> It's unlikely, at this point, that our patches
>> would apply to
>>>>>>> MPICH2,
>>>>>>>> but that is our goal after the 1.0.7/BGP patch settles.
>>>>> For now,
>>>>>>> we'd
>>>>>>>> be sending these as RFC (request for comment) patches.
>>>>>>>>
>>>>>>>> Please let us know if you agree with discussing
>> this on mpich-
>>>>>>> discuss,
>>>>>>>> or if there is a better place.
>>>>>>>>
>>>>>>>> Bob Cernohous:  (T/L 553) 507-253-6093
>>>>>>>>
>>>>>>>> BobC at us.ibm.com
>>>>>>>> IBM Rochester, Building 030-2(C335), Department 61L
>>>>>>>> 3605 Hwy 52 North, Rochester,  MN 55901-7829
>>>>>>>>
>>>>>>>>> Chaos reigns within.
>>>>>>>>> Reflect, repent, and reboot.
>>>>>>>>> Order shall
>>>>> return._______________________________________________
>>>>>>>> dcmf mailing list
>>>>>>>> dcmf at lists.anl-external.org
>>>>>>>> http://lists.anl-external.org/cgi-bin/mailman/listinfo/dcmf
>>>>>>>> http://dcmf.anl-external.
>>>>>> org/wiki_______________________________________________
>>>>>>> dcmf mailing list
>>>>>>> dcmf at lists.anl-external.org
>>>>>>> http://lists.anl-external.org/cgi-bin/mailman/listinfo/dcmf
>>>>>>> http://dcmf.anl-external.org/wiki
>>>>>>
>>>> _______________________________________________
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>>>
>>> -- 
>>> Pavan Balaji
>>> http://www.mcs.anl.gov/~balaji
>>>
>>
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