Hey Matt, Last I looked hydra and SLURM both speak the same PMI2 wire protocol (or at least close enough) for jobs to start up even if mpich wasn't built with --with-pmi=slurm. All you should need to do is "srun --mpi=pmi2". -Aaron On 09/05/2017 01:05 PM, Thompson, Matt (GSFC-610.1)[SCIENCE SYSTEMS AND APPLICATIONS INC] wrote:

Ken,

I thought about that, but doesn't that mean I am stuck with srun as my PM? I've never had great luck with srun compared to hydra (with other MPI stacks).

I know you can't just do your suggestion because:

configure: error: The PM chosen (hydra) requires the PMI implementation simple but slurm was selected as the PMI implementation.

I am currently trying it with --with-pm=none and will test it, though.

Matt

On 09/05/2017 11:21 AM, Kenneth Raffenetti wrote:

...

It looks like you are using the Slurm launcher, but you might not have configured MPICH to use Slurm PMI. Try adding this to your configure line:

--with-pmi=slurm --with-slurm=<path/to/slurm/install>

Ken

On 09/05/2017 09:34 AM, Thompson, Matt (GSFC-610.1)[SCIENCE SYSTEMS AND APPLICATIONS INC] wrote:

...

All,

I've been evaluating different MPI stacks on our cluster and found that MPICH 3.2 does really well on some simple little benchmarks. It also runs Hello World just fine, so I decided to apply it to our climate model (GEOS).

However, the first time I did that, things went a bit nuts. Essentially:

...

(1065) $ mpirun -np 96 ./GEOSgcm.x | & tee withoutppn.log srun.slurm: cluster configuration lacks support for cpu binding Fatal error in PMPI_Comm_create: Unknown error class, error stack: PMPI_Comm_create(564).................: MPI_Comm_create(MPI_COMM_WORLD, group=0x88000000, new_comm=0x106d1740) failed PMPI_Comm_create(541).................: MPIR_Comm_create_intra(215)...........: MPIR_Get_contextid_sparse_group(500)..: MPIR_Allreduce_impl(764)..............: MPIR_Allreduce_intra(257).............: allreduce_intra_or_coll_fn(163).......: MPIR_Allreduce_intra(417).............: MPIDU_Complete_posted_with_error(1137): Process failed MPIR_Allreduce_intra(417).............: MPIDU_Complete_posted_with_error(1137): Process failed MPIR_Allreduce_intra(268).............: MPIR_Bcast_impl(1452).................: MPIR_Bcast(1476)......................: MPIR_Bcast_intra(1287)................: MPIR_Bcast_binomial(310)..............: Failure during collective

(NOTE: The srun.slurm thing is just an error/warning we always get. Doesn't matter if it's MPT, Open MPI, MVAPICH2, Intel MPI...it happens.)

The thing is, it works just fine at (NX-by-NY) of 1x6 and 2x12, but once I go to 3x18, boom, collapse. As I am on 28-core nodes, my first thought was it was due to crossing nodes. But, those benchmarks I ran did just fine for 192 nodes, so...hmm.

Out of desperation, I finally thought, what if it was the fact that 28 doesn't divide 96 and passed in -ppn and:

...

(1068) $ mpirun -ppn 12 -np 96 ./GEOSgcm.x |& tee withppn.log srun.slurm: cluster configuration lacks support for cpu binding

In MAPL_Shmem: NumCores per Node = 12 NumNodes in use = 8 Total PEs = 96 ...

Starts up just fine! Note that every other MPI stack (MPT, Intel MPI, MVAPICH2, and Open MPI) handle the non-ppn type job just fine, but it's possible that they are evenly distributing the processes themselves. And the "MAPL_Shmem" lines you see are just reporting what the process structure looks like. I've added some print statements including this:

if (present(CommIn)) then CommCap = CommIn else CommCap = MPI_COMM_WORLD end if

if (.not.present(CommIn)) then call mpi_init(status) VERIFY_(STATUS) end if write (*,*) "MPI Initialized."

So, boring, and CommIn is *not* present, so we are using MPI_COMM_WORLD, and mpi_init is called as one would. Now if I run:

mpirun -np 96 ./GEOSgcm.x | grep 'MPI Init' | wc -l

to count the number initialized, multiple times, I get results like: 40, 56, 56, 45, 68. Never consistent.

So, I'm a bit at a loss. I freely admit I might have built MPICH3 incorrectly. It was essentially my first time. I configured with:

...

./configure --prefix=$SWDEV/MPI/mpich/3.2/intel_17.0.4.196 \ --disable-wrapper-rpath CC=icc CXX=icpc FC=ifort F77=ifort \ --enable-fortran=all --enable-cxx | & tee configure.intel_17.0.4.196.log

which might be too vanilla for a SLURM/Infiniband cluster, but, yet, it works with -ppn. But maybe I need extra options to work at all times? --with-ibverbs? --with-slurm?

Any ideas on what's happening and what I might have done wrong?

Thanks, Matt

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