[GE users] Machine file and dedicated IB network

igardais igardais at yahoo.fr
Thu May 20 15:46:41 BST 2010

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Hi Beat,

We first had an error message related to the memlock limit : it turns that SGE limited memlock by itself so we added the S_MEMORYLOCK and H_MEMORYLOCK parameter to execd_params.


Le 20 mai 2010 ? 07:01, beatrubi a écrit :

> Hi Ionel!
> Quoting <igardais at yahoo.fr> (19.05.10 15:56):
>> The machine file correctly reports hostname 'mania-X-ib.cluster' and I've
>> forced the I_MPI_DEVICE to "rdma:ib0" to use the ib0 interface.
> Dont' worry about the names in the machinefile. Use the "Ethernet Names" -
> all Infiniband aware MPIs like MVAPICH/MVAPICH2, OpenMPI, Intel MPI or
> Platform/HP MPI are clever enough to use automatically the fast interconnect
> when available.
> Of course you have to configure IPoIB to be able to use Intel MPI. But even
> then, you won't have to use the IPoIB names in the machinefile.
>> I'm still having a (non-SGE-related) issue about DAPL.
>> I've read that RHEL 5.4 has a buggy DAPL layer. I'll see with the
>> MLNX-OFED-1.5.1 release for RHEL 5.4.
> DAPL is pain in the ass. Try the following lines in your .bashrc:
> export I_MPI_DAT_LIBRARY=/usr/lib64/libdat.so.1
> export I_MPI_DEVICE=rdssm
> Use also debugging to see why it fails:
> mpiexec -machinefile machinefile -n 2 -env I_MPI_DEBUG 3 <mpi app>
> Use a benchmark like the Intel MPI Benchmark (formerly Pallas) to check if
> you are really using Infiniband. Intel MPI has a fallback. Your application
> still works when Infiniband couldn't be initialized, but on a very slow
> level.
> Beat
> -- 
>     \|/                           Beat Rubischon <beat at 0x1b.ch>
>   ( 0^0 )                             http://www.0x1b.ch/~beat/
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