Changeset 4796 for BOL/LMDZ_Setup/setup.sh

Timestamp:

Feb 2, 2024, 1:06:35 PM (4 months ago)

Author:

asima

Message:

The usual combination 5MPI * 8OMP per node crashes now with messages :

srun: warning: can't honor --ntasks-per-node set to 5 ... Ignoring --ntasks-per-node.
run: error: Unable to create step for job ...: More processors requested than permitted

(strangely enough, it still runs for 4MPI * 10OMP per node)

Solution adopted (and some comments added) : comment out "--ntasks-per-node=..."

For the record, other solutions that keep "--ntasks-per-node=..." :
--> add "--nodes=..." (=ntasks/ntasks-per-node)
--> or, replace "nthreads=8 ; export OMP_NUM_THREADS=$nthreads"

by "export OMP_NUM_THREADS=$SLURM_CPUS_PER_TASK"

(Not easy to have a job for HPC that could work, one day, on a PC as well...)

File:

• BOL/LMDZ_Setup/setup.sh (modified) (1 diff)

BOL/LMDZ_Setup/setup.sh

@@ -456 +456 @@
 # Choix du nombre de processeurs
 # NOTES : 
-# omp=8 by default, but we need 
+# omp=8 by default (for Jean-Zay must be a divisor of 40 procs/node), but we need 
 #   omp=1 for SPLA (only MPI parallelisation)
 #   omp=2 for veget=CMIP6 beacause of a bug in ORCHIDEE/src_xml/xios_orchidee.f90