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

Thu Feb 28 13:29:40 CST 2008

ok thanks michael. -- rob

On Feb 28, 2008, at 1:18 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
> > > >
> >
> >
>
>