Hi,
I am trying to setup openMPI over RDMA cross machines.
I call MPI_AllReduce() with a 240MB data buffer.
But, it seems openMPI chunks data into small fragments (1MB ~ 15MB), and
then sends them out through RDMA.
Which mca parameters can affect the message size in openMPI?
How to configure "mca
Hi,
i cannot comment for the openib specific part.
the coll/tuned collective module is very likely to split messages in
order to use a more efficient
algorithm. an other way to put it is you probably do not want to use
large messages.
but if this is really what you want, then one option
