Scott Weitzenkamp (sweitzen) wrote:
I am using Intel MPI 3.1 build 26 with OFED 1.3 beta2 on RHEL4 x86_64.
Intel MPI works as before with dapl1, but I see very slow performance
with dapl2. Are there extra command-line params I need to use dapl2?
Intel MPI 3.1.26 does not support uDAPL v2.
How did you configure your servers to run Intel MPI with v2 libraries?
Did you put the ofa-v2-ib0 entry at the top of the /etc/dat.conf file or
specify a v2 device via -genv I_MPI_DEVICE rdssm:ofa-v2-ib0? I didn't
see a device option on your command line.
Anyway, uDAPL v2 support is not there yet.
$ /data/software/qa/MPI/intel_mpi/intelmpi-3.1-`uname -m`/bin/mpiexec
-genv I_MPI_DEBUG 3 -n 2 osu_latency.x
*[1] MPI startup(): DAPL provider NULL on rank 0:svbu-qa1850-1 differs
from NUL
L string on rank 1:svbu-qa1850-2
Looks like it failed over to sockets device because of errors with the
RDMA device specified in dat.conf. Something looks weird with your
dat.conf configuration because Intel MPI is showing NULL as the
provider name (first column in dat.conf).
You can set -genv I_MPI_FAILOVER disable to disable failover and
immediately bail after any RDMA device error.
-arlin
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