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From: chris.neale_at_[hidden]
Date: 2006-09-14 00:08:06


I previously posted this basic question about how to get a max short message
size of 512kb instead of 64kb:
http://www.open-mpi.org/community/lists/users/2006/08/1803.php
Appologies for the repost, but I simply can't figure this out.
My application (Gromacs) works fine with LAM.

I have tried:
mpirun --mca btl_tcp_eager_limit 524288 --mca btl_tcp_max_send_size 524288 --mca
btl_tcp_min_rdma_size 524288 --mca btl_tcp_sndbuf 1048576 --mca btl_tcp_rcvbuf
1048576
*****Crashes immediately with a MPI_Alltoall error

--mca btl_tcp_eager_limit 524288 --mca btl_tcp_min_send_size 524288 --mca
btl_tcp_max_send_size 1048576 --mca btl_tcp_min_rdma_size 1048576 --mca
btl_tcp_sndbuf 1048576 --mca btl_tcp_rcvbuf 1048576 --mca btl_base_verbose 1
--mca btl_base_debug
*****Same thing

mpirun --mca btl_tcp_eager_limit 524288
*****Same thing

mpirun --mca btl_tcp_eager_limit 131072
*****Seems to work, but no benifit (I need at least 223560)

mpirun --mca btl_tcp_eager_limit 141072
*****Tried this only as a test, Overloaded the main node.

Much appreciation and thanks,
Chris Neale.