To be sure: both packages were provided by NVIDIA (I didn't compile them)
Am 24.01.22 um 16:13 schrieb Matthias Leopold:
Thx, but I don't see this option in any of the two versions:
/usr/mpi/gcc/openmpi-4.1.2a1/bin/ompi_info (works with slurm):
Configure command line: '--build=x86_64-linux-gnu' '--prefix=/usr'
'--includedir=${prefix}/include' '--mandir=${prefix}/share/man'
'--infodir=${prefix}/share/info' '--sysconfdir=/etc'
'--localstatedir=/var' '--disable-silent-rules'
'--libexecdir=${prefix}/lib/openmpi' '--disable-maintainer-mode'
'--disable-dependency-tracking' '--prefix=/usr/mpi/gcc/openmpi-4.1.2a1'
'--with-platform=contrib/platform/mellanox/optimized'
lmod ompi (doesn't work with slurm)
Configure command line:
'--prefix=/proj/nv/libraries/Linux_x86_64/dev/openmpi4/205295-dev-clean-1'
'CC=nvc -nomp' 'CXX=nvc++ -nomp' 'FC=nvfortran -nomp' 'CFLAGS=-O1 -fPIC
-c99 -tp p7-64' 'CXXFLAGS=-O1 -fPIC -tp p7-64' 'FCFLAGS=-O1 -fPIC -tp
p7-64' 'LD=ld' '--enable-shared' '--enable-static' '--without-tm'
'--enable-mpi-cxx' '--disable-wrapper-runpath'
'--enable-mpirun-prefix-by-default' '--with-libevent=internal'
'--with-slurm' '--without-libnl' '--enable-mpi1-compatibility'
'--enable-mca-no-build=btl-uct' '--without-verbs'
'--with-cuda=/proj/cuda/11.0/Linux_x86_64'
'--with-ucx=/proj/nv/libraries/Linux_x86_64/dev/openmpi4/205295-dev-clean-1'
Matthias
Am 24.01.22 um 15:59 schrieb Ralph Castain via users:
If you look at your configure line, you forgot to include
--with-pmi=<path-to-slurm-pmi-lib>. We don't build the Slurm PMI
support by default due to the GPL licensing issues - you have to point
at it.
On Jan 24, 2022, at 6:41 AM, Matthias Leopold via users
<users@lists.open-mpi.org> wrote:
Hi,
we have 2 DGX A100 machines and I'm trying to run nccl-tests
(https://github.com/NVIDIA/nccl-tests) in various ways to understand
how things work.
I can successfully run nccl-tests on both nodes with Slurm (via srun)
when built directly on a compute node against Open MPI 4.1.2 coming
from a NVIDIA deb package.
I can also build nccl-tests in a lmod environment with NVIDIA HPC SDK
21.09 with Open MPI 4.0.5. When I run this with Slurm (via srun) I
get the following message:
[foo:1140698] OPAL ERROR: Error in file
../../../../../opal/mca/pmix/pmix3x/pmix3x_client.c at line 112
--------------------------------------------------------------------------
The application appears to have been direct launched using "srun",
but OMPI was not built with SLURM's PMI support and therefore cannot
execute. There are several options for building PMI support under
SLURM, depending upon the SLURM version you are using:
version 16.05 or later: you can use SLURM's PMIx support. This
requires that you configure and build SLURM --with-pmix.
Versions earlier than 16.05: you must use either SLURM's PMI-1 or
PMI-2 support. SLURM builds PMI-1 by default, or you can manually
install PMI-2. You must then build Open MPI using --with-pmi pointing
to the SLURM PMI library location.
Please configure as appropriate and try again.
--------------------------------------------------------------------------
*** An error occurred in MPI_Init
*** on a NULL communicator
*** MPI_ERRORS_ARE_FATAL (processes in this communicator will now abort,
*** and potentially your MPI job)
When I look at PMI support in both Open MPI packages I don't see a
lot of difference:
“/usr/mpi/gcc/openmpi-4.1.2a1/bin/ompi_info --parsable | grep -i pmi”:
mca:pmix:isolated:version:“mca:2.1.0”
mca:pmix:isolated:version:“api:2.0.0”
mca:pmix:isolated:version:“component:4.1.2”
mca:pmix:flux:version:“mca:2.1.0”
mca:pmix:flux:version:“api:2.0.0”
mca:pmix:flux:version:“component:4.1.2”
mca:pmix:pmix3x:version:“mca:2.1.0”
mca:pmix:pmix3x:version:“api:2.0.0”
mca:pmix:pmix3x:version:“component:4.1.2”
mca:ess:pmi:version:“mca:2.1.0”
mca:ess:pmi:version:“api:3.0.0”
mca:ess:pmi:version:“component:4.1.2”
“/msc/sw/hpc-sdk/Linux_x86_64/21.9/comm_libs/mpi/bin/ompi_info
--parsable | grep -i pmi”:
mca:pmix:isolated:version:“mca:2.1.0”
mca:pmix:isolated:version:“api:2.0.0”
mca:pmix:isolated:version:“component:4.0.5”
mca:pmix:pmix3x:version:“mca:2.1.0”
mca:pmix:pmix3x:version:“api:2.0.0”
mca:pmix:pmix3x:version:“component:4.0.5”
mca:ess:pmi:version:“mca:2.1.0”
mca:ess:pmi:version:“api:3.0.0”
mca:ess:pmi:version:“component:4.0.5”
I don't know if that's the right place I'm looking at, but to me it
seems it's an Open MPI topic, this is why I'm posting here. Please
explain what's missing in my case.
Slurm is 21.08.5. "MpiDefault" in slurm.conf is "pmix".
Both Open MPI versions have Slurm support.
thx
Matthias
--
Matthias Leopold
IT Systems & Communications
Medizinische Universität Wien
Spitalgasse 23 / BT 88 / Ebene 00
A-1090 Wien
Tel: +43 1 40160-21241
Fax: +43 1 40160-921200
