[openib-general] GAMESS and MVAPICH

Tue Apr 20 15:22:42 PDT 2004

Actually, I'm not sure if it's polling memory or the card. Either way I
would argue the MPI implementation should allow the poll time to be tuned.

On Tue, Apr 20, 2004 at 01:35:20PM -0700, Larsen, Roy K wrote:
> Could you clarify for me if the polling technique is one of poll_cq or of polling a buffer memory location.  Some MPI implementations use such a technique to remove the poll_cq overhead.....
> 
> Thanks,
> Roy
> 
> -----Original Message-----
> From: Troy Benjegerdes [mailto:hozer at hozed.org]
> Sent: Tuesday, April 20, 2004 11:05 AM
> To: Dhabaleswar Panda
> Cc: openib-general at openib.org
> Subject: [openib-general] GAMESS and MVAPICH
> 
> 
> On Mon, Mar 29, 2004 at 05:45:29PM -0500, Dhabaleswar Panda wrote:
> > Troy, 
> > 
> > You must have received a 2-line patch (related to memory
> > registration/deregistration in MVAPICH2) from one of my students a
> > short while ago. You can try that and let me know whether the problem
> > is solved or not.
> > 
> > Please note that the MVAPICH2 release (0.5a) is an `alpha' release
> > based on MPICH2 0.94b. I do not think we have touched anything related
> > to MPI communicators.
> > 
> > If the problem persists, you can let us know the exact details of the
> > errors you are seeing and we will be happy to take a look at it.
> > 
> > I will also suggest you to try GAMESS with MVAPICH. Based on our
> > earlier conversation, I think it was running successfully with
> > MVAPICH. Please let me know the status.
> > 
> 
> We have successfully run GAMESS and gotten the correct answer on
> MVIAPICH and mellanox vapi.
> 
> GAMESS uses a compute process and a data-server process model, and this
> causes problems on MPI implementations that use polling. We've seen this
> on Myrinet and Dolphin-SCI based MPI's, and now also on infiniband.
> 
> Is there a tuning parameter in one of the openib candidate stacks that
> allows tuning of polling vs interrupt driven operation? At the moment
> the data server winds up polling the infiniband card and taking cpu from
> the compute process.
> 
> -- 
> --------------------------------------------------------------------------
> Troy Benjegerdes                'da hozer'                hozer at hozed.org  
> 
> Somone asked my why I work on this free (http://www.fsf.org/philosophy/)
> software stuff and not get a real job. Charles Shultz had the best answer:
> 
> "Why do musicians compose symphonies and poets write poems? They do it
> because life wouldn't have any meaning for them if they didn't. That's why
> I draw cartoons. It's my life." -- Charles Shultz
> 
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-- 
--------------------------------------------------------------------------
Troy Benjegerdes                'da hozer'                hozer at hozed.org  

Somone asked my why I work on this free (http://www.fsf.org/philosophy/)
software stuff and not get a real job. Charles Shultz had the best answer:

"Why do musicians compose symphonies and poets write poems? They do it
because life wouldn't have any meaning for them if they didn't. That's why
I draw cartoons. It's my life." -- Charles Shultz

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