A partial-node MPI job failed to start using Intel MPI mpiexec
A partial-node MPI job may fail to start using mpiexec
from intelmpi/2019.3
and intelmpi/2019.7
with error messages like
A partial-node MPI job may fail to start using mpiexec
from intelmpi/2019.3
and intelmpi/2019.7
with error messages like
OSC is currently experiencing problems with its internal network. Interactive sessions may be slow or unresponsive, but running jobs should not be affected.
Users would encounter a MPI job failed with openmpi/3.1.0-hpcx
on Owens and Pitzer. The job would stop with the error like "There are not enough slots available in the system to satisfy the slots". Please switch to openmpi/3.1.4-hpcx
. The buggy version openmpi/3.1.0-hpcx
will be removed on August 18 2020.
==========
Resolved: We removed openmpi/3.1.0-hpcx
on August 18 2020.
The CUDA debugger, cuda-gdb, can raise a segmentation fault immediately upon execution. A workaround before executing cuda-gdb is to unload the xalt module, e.g.:
module unload xalt
This issue affects most cuda modules on Pitzer and Owens.
Users may encoutner an error like 'libim_client.so: undefined reference to `uuid_unparse@UUID_1.0' while compiling MPI applications with mvapich2 in some Conda enivronments. We found pre-installed libuuid package from Conda conflicting with system libuuid libraries. The affected Conda packages are python/2.7-conda5.2
, python/3.6-conda5.2
and python/3.7-2019.10
.
Users may encounter under-performing MPI jobs or failures of compiling MPI applications if you are using Conda from system. We found pre-installed mpich2 package in some Conda environments overrides default MPI path. The affected Conda packages are python/2.7-conda5.2
and python/3.6-conda5.2
. If users experience these issues, please re-load MPI module, e.g. module load mvapich2/2.3.2
after setting up your Conda environment.
A batch job output may contain warnings about excessive memory usage.
We will have rolling reboots of Owens and Pitzer clusters including login and compute nodes, starting from Monday, February 3, 2020
We have found that large MPI jobs may hang at startup with mvapich2/2.3
and mvapich/2.3.1
(on any compiler dependency) due to a known bug that has been fixed in release 2.3.2. If users experience this issue, please switch to mvapich2/2.3.2
.
We are having rolling reboots of Owens cluster including login and compute nodes, starting from October 10, 2019.