[openib-general] GAMESS and MVAPICH

Wed Apr 21 07:47:36 PDT 2004

Troy,

Troy Benjegerdes wrote:

>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.
>
Currently in MVAPICH2 (MPI-2), only polling mode is possible with our 
current RDMA channel interface. A blocking mode is not possible unless 
we re-implement using a different interface such as CH3 or ADI3. We are 
considering this feature for our next release of MVAPICH2.

Currently in MVAPICH (MPI-1), it is possible to use the blocking 
approach if you choose to use send / recv instead of RDMA for small / 
control messages. We are considering making this option visible to users 
in our next release.

Thanks,
Sayantan.

-- 
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Sayantan Sur            Graduate Research Assistant

        Computer & Info Sciences
Ohio State University,  Office : 
Columbus,               email  : surs at cis.ohio-state.edu
           phone(res) : 
USA.                    phone(off) : 
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