[openib-general] GAMESS and MVAPICH
Sayantan Sur
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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