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

Thu Feb 28 13:40:01 CST 2008

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