#include <stdio.h>
#include <mpi.h>
-int ibm_test(int rank, int size) {
+static int ibm_test(int rank, int size)
+{
#define MAXLEN 10000
- int success = 1;
- int root=0;
- int i,j,k;
- int *out;
- int *in;
-
-
- out = malloc(MAXLEN*64*sizeof(int));
- in = malloc(MAXLEN*sizeof(int));
-
- for(j=1;j<=MAXLEN;j*=10){
- root=(root+1)%size;
- if (rank == root)
- for(i=0;i<j*size;i++)
- out[i] = i;
-
- MPI_Scatter(out,j,MPI_INT,in,j,MPI_INT,root,MPI_COMM_WORLD);
-
- for(k=0;k<j;k++) {
- if(in[k] != k+rank*j) {
- fprintf(stderr,"task %d bad answer (%d) at index %d k of %d (should be %d)", rank,in[k],k,j,(k+rank*j));
- return( 0 );
- }
- }
- }
- free(out);
- free(in);
- MPI_Barrier( MPI_COMM_WORLD );
- return( success );
+ int success = 1;
+ int root = 0;
+ int i, j, k;
+ int *out;
+ int *in;
+
+
+ out = malloc(MAXLEN * 64 * sizeof(int));
+ in = malloc(MAXLEN * sizeof(int));
+
+ for (j = 1; j <= MAXLEN; j *= 10) {
+ root = (root + 1) % size;
+ if (rank == root)
+ for (i = 0; i < j * size; i++)
+ out[i] = i;
+
+ MPI_Scatter(out, j, MPI_INT, in, j, MPI_INT, root, MPI_COMM_WORLD);
+
+ for (k = 0; k < j; k++) {
+ if (in[k] != k + rank * j) {
+ fprintf(stderr,
+ "task %d bad answer (%d) at index %d k of %d (should be %d)",
+ rank, in[k], k, j, (k + rank * j));
+ return (0);
+ }
+ }
+ }
+ free(out);
+ free(in);
+ MPI_Barrier(MPI_COMM_WORLD);
+ return (success);
}
/**
* small test: the root sends a single distinct double to other processes
**/
-int small_test( int rank, int size ) {
- int success=1;
- int retval;
- int sendcount=1; // one double to each process
- int recvcount=1;
- int i;
- double *sndbuf =NULL;
- double rcvd;
- int root=0; // arbitrary choice
-
- // on root, initialize sendbuf
- if (root == rank ) {
- sndbuf = malloc( size * sizeof(double));
- for (i=0; i< size;i++) {
- sndbuf[i] = (double) i;
- }
- }
-
- retval=MPI_Scatter(sndbuf, sendcount, MPI_DOUBLE, &rcvd,recvcount,MPI_DOUBLE,root,MPI_COMM_WORLD);
- if (retval != MPI_SUCCESS) {
- fprintf(stderr,"(%s:%d) MPI_Scatter() returned retval=%d\n",__FILE__,__LINE__,retval);
- return 0;
- }
-
- // verification
- if ((double)rank != rcvd) {
- fprintf(stderr,"[%d] has %lf instead of %d\n",rank,rcvd,rank);
- success=0;
- }
- return(success);
+static int small_test(int rank, int size)
+{
+ int success = 1;
+ int retval;
+ int sendcount = 1; // one double to each process
+ int recvcount = 1;
+ int i;
+ double *sndbuf = NULL;
+ double rcvd;
+ int root = 0; // arbitrary choice
+
+ // on root, initialize sendbuf
+ if (root == rank) {
+ sndbuf = malloc(size * sizeof(double));
+ for (i = 0; i < size; i++) {
+ sndbuf[i] = (double) i;
+ }
+ }
+
+ retval =
+ MPI_Scatter(sndbuf, sendcount, MPI_DOUBLE, &rcvd, recvcount,
+ MPI_DOUBLE, root, MPI_COMM_WORLD);
+ if (retval != MPI_SUCCESS) {
+ fprintf(stderr, "(%s:%d) MPI_Scatter() returned retval=%d\n", __FILE__,
+ __LINE__, retval);
+ return 0;
+ }
+ // verification
+ if ((double) rank != rcvd) {
+ fprintf(stderr, "[%d] has %lf instead of %d\n", rank, rcvd, rank);
+ success = 0;
+ }
+ return (success);
}
int main(int argc, char **argv)
{
- int size, rank;
+ int size, rank;
- MPI_Init(&argc, &argv);
- MPI_Comm_size(MPI_COMM_WORLD, &size);
- MPI_Comm_rank(MPI_COMM_WORLD, &rank);
+ MPI_Init(&argc, &argv);
+ MPI_Comm_size(MPI_COMM_WORLD, &size);
+ MPI_Comm_rank(MPI_COMM_WORLD, &rank);
- /* test 1 */
- if (0 == rank)
- printf("** Small Test Result: ... \n");
- if (! small_test( rank, size ))
- printf("\t[%d] failed.\n", rank);
- else
- printf("\t[%d] ok.\n", rank);
+ /* test 1 */
+ if (0 == rank)
+ printf("** Small Test Result: ... \n");
+ if (!small_test(rank, size))
+ printf("\t[%d] failed.\n", rank);
+ else
+ printf("\t[%d] ok.\n", rank);
- MPI_Barrier( MPI_COMM_WORLD );
+ MPI_Barrier(MPI_COMM_WORLD);
- /* test 2 */
- if (0 == rank)
- printf("** IBM Test Result: ... \n");
- if (!ibm_test(rank, size))
- printf("\t[%d] failed.\n", rank);
- else
- printf("\t[%d] ok.\n", rank);
+ /* test 2 */
+ if (0 == rank)
+ printf("** IBM Test Result: ... \n");
+ if (!ibm_test(rank, size))
+ printf("\t[%d] failed.\n", rank);
+ else
+ printf("\t[%d] ok.\n", rank);
- MPI_Finalize();
- return 0;
+ MPI_Finalize();
+ return 0;
}
