Changes between Initial Version and Version 1 of cypress/Programming/Cexamples/OpenMp

Timestamp:

05/14/15 14:20:42 (10 years ago)

Author:

cmaggio

Comment:

—

cypress/Programming/Cexamples/OpenMp

@@ +1 @@
+= OpenMP C =
+
+== Hello World ==
+{{{#!C
+/*
+  hellp_omp.c: display a message on the screen
+*/
+#include <stdio.h>
+#include <omp.h>
+ 
+int main () {
+  int id, nthreads;
+  printf("C Start\n");
+#pragma omp parallel private(id)
+  {
+    id = omp_get_thread_num();
+    printf("hello from %d\n", id);
+#pragma omp barrier
+    if ( id == 0 ) {
+      nthreads = omp_get_num_threads();
+      printf("%d threads said hello!\n",nthreads);
+    }
+  }
+  printf("End\n");
+}
+}}}
+
+=== Compile with GNU C === 
+{{{gcc hello_omp.c -fopemp}}}
+
+=== Compile with Intel C ===
+{{{icc hello_omp.c -openmp}}}
+
+=== Example of Jobscript ===
+{{{#!sh
+#SBATCH --job-name=HelloC_OMP
+#SBATCH --qos=normal
+#SBATCH --time=00:10:00
+#SBATCH --nodes=1
+#SBATCH --ntasks-per-node=1
+#SBATCH --cpus-per-task=4
+
+########## THE JOB ITSELF ###########
+export OMP_NUM_THREADS=$SLURM_CPUS_PER_TASK
+ 
+echo Start Job
+pwd
+cat $SLURM_JOB_NODELIST
+ 
+./a.out
+ 
+echo End job
+}}}