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<p class="MsoNormal">Hello,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">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:<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:70.8pt"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:70.8pt">#!/bin/bash<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:70.8pt"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:70.8pt">#SBATCH --job-name=hellohybrid<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:70.8pt">#SBATCH --output=hellohybrid.out<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:70.8pt">#SBATCH --ntasks=4<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:70.8pt">#SBATCH --cpus-per-task=3<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:70.8pt">#SBATCH --partition=nodes<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:70.8pt"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:70.8pt"># Load the default OpenMPI module.<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:70.8pt">source /soft/modules-3.2.10/Modules/3.2.10/init/bash<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:70.8pt">module load openmpi/3.0.0<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:70.8pt"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:70.8pt"># Set OMP_NUM_THREADS to the number of CPUs per task we asked for<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:70.8pt">export OMP_NUM_THREADS=$(($SLURM_CPUS_PER_TASK))<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:70.8pt"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:70.8pt"># Run the process with mpirun. Note that the -n option is not required<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:70.8pt"># in this case; mpirun will automatically determine how many processes<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:70.8pt"># to run from the Slurm settings.<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:70.8pt"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:70.8pt">mpirun hybrid_hello<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:70.8pt"><o:p> </o:p></p>
<p class="MsoNormal">However, output is this:<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:70.8pt">Hello from thread 0 out of 3 from process 0 out of 4 on node1<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:70.8pt">Hello from thread 2 out of 3 from process 0 out of 4 on node1<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:70.8pt">Hello from thread 0 out of 3 from process 1 out of 4 on node1<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:70.8pt">Hello from thread 1 out of 3 from process 1 out of 4 on node1<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:70.8pt">Hello from thread 0 out of 3 from process 2 out of 4 on node1<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:70.8pt">Hello from thread 1 out of 3 from process 2 out of 4 on node1<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:70.8pt">Hello from thread 2 out of 3 from process 1 out of 4 on node1<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:70.8pt">Hello from thread 0 out of 3 from process 3 out of 4 on node2<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:70.8pt">Hello from thread 2 out of 3 from process 3 out of 4 on node2<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:70.8pt">Hello from thread 1 out of 3 from process 3 out of 4 on node2<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:70.8pt">Hello from thread 1 out of 3 from process 0 out of 4 on node1<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:70.8pt">Hello from thread 2 out of 3 from process 2 out of 4 on node1<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:70.8pt"><o:p> </o:p></p>
<p class="MsoNormal">As you could see, ode1 has run 9 threads, but my computer can only assign 8… can’t it? Or am I wrong????<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks.<o:p></o:p></p>
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