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

Thu Feb 28 13:11:56 CST 2008

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._______________________________________________
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> > > org/wiki_______________________________________________
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> > >
>
>