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

Rob Ross rross at mcs.anl.gov
Thu Feb 28 13:45:27 CST 2008 

Michael, can you give Pavan this list? Thanks. -- Rob

On Feb 28, 2008, at 1:40 PM, Pavan Balaji wrote:

>
> Hmm.. I don't know what the authorization password is. Can someone  
> send me the list of folks to be added from IBM?
>
> -- Pavan
>
> On 02/28/2008 01:18 PM, Michael Blocksome wrote:
>> Log in with your email address and password at the bottom of this  
>> page to see the "roster"
>>        http://lists.anl-external.org/cgi-bin/mailman/listinfo/dcmf
>> Michael Blocksome
>> Blue Gene Messaging Team Lead
>> Advanced Systems SW Development
>> blocksom at us.ibm.com
>> *Rob Ross <rross at mcs.anl.gov>*
>> 02/28/2008 01:11 PM
>> 	
>> To
>> 	Michael Blocksome/Rochester/IBM at IBMUS
>> cc
>> 	dcmf at lists.anl-external.org, dcmf-bounces at lists.anl-external.org,  
>> "Rajeev Thakur" <thakur at mcs.anl.gov>
>> Subject
>> 	Re: [dcmf] 32-bit ROMIO: What is the best solution?
>> 	
>> Hi,
>> Is someone on this list that can get that list of email addresses?
>> Rob
>> On Feb 28, 2008, at 12:59 PM, Michael Blocksome wrote:
>> >
>> > ok .. mpich2-dev it is.  Let's just add all of the ...
>> >
>> > *@*.ibm.com
>> >
>> > ... email addresses that are subscribed to the dcmf mailing  
>> list.   > If someone is not interested they could always remove  
>> themselves   > from the mpich2-dev list later.
>> >
>> > Thanks
>> >
>> > Michael Blocksome
>> > Blue Gene Messaging Team Lead
>> > Advanced Systems SW Development
>> > blocksom at us.ibm.com
>> >
>> >
>> >
>> > Rob Ross <rross at mcs.anl.gov>
>> > 02/28/2008 12:39 PM
>> >
>> > To
>> > Michael Blocksome/Rochester/IBM at IBMUS
>> > cc
>> > dcmf at lists.anl-external.org, dcmf-bounces at lists.anl- 
>> external.org,   > "Rajeev Thakur" <thakur at mcs.anl.gov>
>> > Subject
>> > Re: [dcmf] 32-bit ROMIO: What is the best solution?
>> >
>> >
>> >
>> >
>> >
>> > 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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