Hello, I'm running this script in a cluster composed by 11 nodes, each one with 1 processor with 4 cores and 1 thread per core:
#!/bin/bash #SBATCH --job-name=hellohybrid #SBATCH --output=hellohybrid.out #SBATCH --ntasks=4 #SBATCH --cpus-per-task=3 #SBATCH --partition=nodes # Load the default OpenMPI module. source /soft/modules-3.2.10/Modules/3.2.10/init/bash module load openmpi/3.0.0 # Set OMP_NUM_THREADS to the number of CPUs per task we asked for export OMP_NUM_THREADS=$(($SLURM_CPUS_PER_TASK)) # Run the process with mpirun. Note that the -n option is not required # in this case; mpirun will automatically determine how many processes # to run from the Slurm settings. mpirun hybrid_hello However, output is this: Hello from thread 0 out of 3 from process 0 out of 4 on node1 Hello from thread 2 out of 3 from process 0 out of 4 on node1 Hello from thread 0 out of 3 from process 1 out of 4 on node1 Hello from thread 1 out of 3 from process 1 out of 4 on node1 Hello from thread 0 out of 3 from process 2 out of 4 on node1 Hello from thread 1 out of 3 from process 2 out of 4 on node1 Hello from thread 2 out of 3 from process 1 out of 4 on node1 Hello from thread 0 out of 3 from process 3 out of 4 on node2 Hello from thread 2 out of 3 from process 3 out of 4 on node2 Hello from thread 1 out of 3 from process 3 out of 4 on node2 Hello from thread 1 out of 3 from process 0 out of 4 on node1 Hello from thread 2 out of 3 from process 2 out of 4 on node1 As you could see, ode1 has run 9 threads, but my computer can only assign 8... can't it? Or am I wrong???? Thanks.
