add hpc stuff

hpc/prime/prime_c.c

+#include <stdio.h>
+#include <math.h>
+
+int main () {
+
+  int lower, upper,total,i,j;
+  int isprime;
+
+  total = 0;
+  lower = 2;
+  upper = 1234567;
+
+  for (i = lower; i<= upper; i++) {
+    isprime = 1;
+    for ( j=2; j<i; j++) {
+      if (i % j == 0) {
+        isprime = 0;
+        break;
+      }
+    }
+    total+=isprime;
+  }
+
+  printf("Number of Prime Numbers from %d to %d=%d\n",lower,upper,total);
+}

hpc/prime/prime_mpi.c

+#include <stdio.h>
+#include "mpi.h"
+#include <stdlib.h>
+#include <assert.h>
+
+int main(int argc, char *argv[]) {
+  int lower,upper,total,i,j,isprime;
+  int rank, size;
+  int local_total = 0;
+  int global_total = 0;
+  double time_initial,time_current,time;
+
+  MPI_Init(&argc, &argv);
+  time_initial = MPI_Wtime();
+
+  MPI_Comm_rank(MPI_COMM_WORLD, &rank);
+  MPI_Comm_size(MPI_COMM_WORLD, &size);
+
+  local_total = 0;
+  lower = 2;
+  upper = 1234567;
+
+  MPI_Bcast ( &upper, 1, MPI_INT, 0, MPI_COMM_WORLD );
+
+  for (i = lower + rank; i<= upper; i=i+size) {
+    isprime = 1;
+    for ( j=2; j<i; j++) {
+      if (i % j == 0) {
+        isprime = 0;
+        break;
+      }
+    }
+    local_total+=isprime;
+  }
+
+  MPI_Reduce(&local_total,&global_total,1,MPI_INT,MPI_SUM,0,MPI_COMM_WORLD);
+
+  time_current=MPI_Wtime();
+  time = time_current - time_initial;
+
+  if (rank == 0) {
+    printf("Total Prime Numbers = %d\n",global_total);
+    printf("ElapsedTime=%.3f\n",time);
+  }
+
+  MPI_Barrier(MPI_COMM_WORLD);
+  MPI_Finalize();
+  return 0;
+}