1 /* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
3 * (C) 2001 by Argonne National Laboratory.
4 * See COPYRIGHT in top-level directory.
9 void addem ( int *, int *, int *, MPI_Datatype * );
10 void assoc ( int *, int *, int *, MPI_Datatype * );
12 void addem( int *invec, int *inoutvec, int *len, MPI_Datatype *dtype)
15 for ( i=0; i<*len; i++ )
16 inoutvec[i] += invec[i];
19 #define BAD_ANSWER 100000
22 The operation is inoutvec[i] = invec[i] op inoutvec[i]
23 (see 4.9.4). The order is important.
25 Note that the computation is in process rank (in the communicator)
26 order, independant of the root.
28 void assoc( int *invec, int *inoutvec, int *len, MPI_Datatype *dtype)
31 for ( i=0; i<*len; i++ ) {
32 if (inoutvec[i] <= invec[i] ) {
34 MPI_Comm_rank( MPI_COMM_WORLD, &rank );
35 fprintf( stderr, "[%d] inout[0] = %d, in[0] = %d\n",
36 rank, inoutvec[0], invec[0] );
37 inoutvec[i] = BAD_ANSWER;
40 inoutvec[i] = invec[i];
44 int main( int argc, char **argv )
51 MPI_Op op_assoc, op_addem;
52 MPI_Comm comm=MPI_COMM_WORLD;
54 MPI_Init( &argc, &argv );
55 MPI_Op_create( (MPI_User_function *)assoc, 0, &op_assoc );
56 MPI_Op_create( (MPI_User_function *)addem, 1, &op_addem );
58 /* Run this for a variety of communicator sizes */
60 MPI_Comm_rank( comm, &rank );
61 MPI_Comm_size( comm, &size );
69 MPI_Scan ( &data, &result, 1, MPI_INT, MPI_SUM, comm );
70 if (result != correct_result) {
71 fprintf( stderr, "[%d] Error suming ints with scan\n", rank );
75 MPI_Scan ( &data, &result, 1, MPI_INT, MPI_SUM, comm );
76 if (result != correct_result) {
77 fprintf( stderr, "[%d] Error summing ints with scan (2)\n", rank );
83 MPI_Scan ( &data, &result, 1, MPI_INT, op_addem, comm );
84 if (result != correct_result) {
85 fprintf( stderr, "[%d] Error summing ints with scan (userop)\n",
90 MPI_Scan ( &data, &result, 1, MPI_INT, op_addem, comm );
91 if (result != correct_result) {
92 fprintf( stderr, "[%d] Error summing ints with scan (userop2)\n",
98 MPI_Scan ( &data, &result, 1, MPI_INT, op_assoc, comm );
99 if (result == BAD_ANSWER) {
100 fprintf( stderr, "[%d] Error scanning with non-commutative op\n",
105 MPI_Op_free( &op_assoc );
106 MPI_Op_free( &op_addem );
110 printf( "[%d] done with ERRORS(%d)!\n", rank, errors );
113 printf(" No Errors\n");