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Subject: [OMPI users] Using Service Levels (SLs) with OpenMPI 1.6.4 + MLNX_OFED 2.0
From: Jesús Escudero Sahuquillo (jescudero_at_[hidden])
Date: 2013-06-11 08:02:21


I have a 16-node Mellanox cluster built with Mellanox ConnectX3 cards.
Recently I have updated the MLNX_OFED to the 2.0.5 version. The reason
of this e-mail to the OpenMPI users list is that I am not able to run
MPI applications using the service levels (SLs) feature of the OpenMPI
driver.

Currently, the nodes have the Red-Hat 6.4 with the kernel
2.6.32-358.el6.x86_64. I have compiled OpenMPI 1.6.4 with:

  ./configure --with-sge --with-openib=/usr --enable-openib-connectx-xrc
--enable-mpi-thread-multiple --with-threads --with-hwloc
--enable-heterogeneous --with-fca=/opt/mellanox/fca
--with-mxm-libdir=/opt/mellanox/mxm/lib --with-mxm=/opt/mellanox/mxm
--prefix=/home/jescudero/opt/openmpi

I have modified the OpenSM code (which is based on 3.3.15) in order to
include a special routing algorithm based on "ftree". Apparently all is
correct with the OpenSM since it returns the SLs when I execute the
command "saquery --src-to-dst slid:dlid". Anyway, I have also tried to
run the OpenSM with the DFSSSP algorithm.

However, when I try to run MPI applications (i.e. HPCC, OSU or even
alltoall.c -included in the OpenMPI sources-) I experience some errors
if the "btl_openib_path_record_info" is set to "1", otherwise (i.e. if
the btl_openib_path_record_info is not enabled) the application
execution ends correctly. I run the MPI application with the next command:

mpirun -display-allocation -display-map -np 8 -machinefile maquinas.aux
--mca btl openib,self,sm --mca mtl mxm --mca
btl_openib_ib_path_record_service_level 1 --mca btl_openib_cpc_include
oob hpcc

I obtain the next trace:

[nodo20.XXXXX][[31227,1],6][connect/btl_openib_connect_sl.c:239:get_pathrecord_info]
error posting receive on QP [0x16db] errno says: Success [0]
[nodo15.XXXXX][[31227,1],4][connect/btl_openib_connect_sl.c:239:get_pathrecord_info]
error posting receive on QP [0x1749] errno says: Success [0]
[nodo17.XXXXX][[31227,1],5][connect/btl_openib_connect_sl.c:239:get_pathrecord_info]
error posting receive on QP [0x1783] errno says: Success [0]
[nodo21.XXXXX][[31227,1],7][connect/btl_openib_connect_sl.c:239:get_pathrecord_info]
error posting receive on QP [0x1838] errno says: Success [0]
[nodo21.XXXXX][[31227,1],7][connect/btl_openib_connect_oob.c:885:rml_recv_cb]
endpoint connect error: -1
[nodo17.XXXXX][[31227,1],5][connect/btl_openib_connect_oob.c:885:rml_recv_cb]
endpoint connect error: -1
[nodo15.XXXXX][[31227,1],4][connect/btl_openib_connect_oob.c:885:rml_recv_cb]
endpoint connect error: -1
[nodo20.XXXXX][[31227,1],6][connect/btl_openib_connect_oob.c:885:rml_recv_cb]
endpoint connect error: -1

Does anyone know what I am doing wrong?

All the best,