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

Timestamp:

05/14/15 14:27:18 (10 years ago)

Author:

cmaggio

Comment:

migrated content from ccs wiki and edited for cypress

cypress/Programming/Cexamples/Mpi

@@ +1 @@
+= MPI C =
+== Hello World ==
+{{{#!C
+/*
+  hello_mpi.c: display a message on the screen
+ */
+#include <stdio.h>
+#include <mpi.h>
+ 
+int main (int argc, char *argv[]) {
+  int myid,numproc;
+ 
+  /* Initialize */
+  MPI_Init(&argc,&argv);
+ 
+  /* get myid and # of processors */
+  MPI_Comm_size(MPI_COMM_WORLD,&numproc);
+  MPI_Comm_rank(MPI_COMM_WORLD,&myid);
+ 
+  printf("hello from %d\n", myid);
+ 
+  /* wait until all processors come here */
+  MPI_Barrier (MPI_COMM_WORLD);
+ 
+  if ( myid == 0 ) {
+    /* only id = 0 do this */
+    printf("%d processors said hello!\n",numproc);
+  }
+ 
+  MPI_Finalize();
+}
+}}}
+
+=== Compile ===
+{{{mpicc hello_mpi.c}}}
+
+== Example of Jobscript ==
+{{{#!sh
+#!/bin/bash
+#SBATCH --job-name=HelloC_MPI
+#SBATCH --qos=normal
+#SBATCH --time=0-00:10:00
+#SBATCH --nodes=4
+#SBATCH --ntasks-per-node=1
+ 
+########## THE JOB ITSELF ###########
+ 
+echo Start Job
+pwd
+cat $SLURM_JOB_NODELIST
+echo Number of tasks: $SLURM_NTASKS
+ 
+mpirun ./a.out
+ 
+echo End job
+}}}