1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
|
/*
* Copyright (C) by Argonne National Laboratory
* See COPYRIGHT in top-level directory
*/
#include "mpi.h"
#include <stdio.h>
#include "mpitest.h"
void addem(int *, int *, int *, MPI_Datatype *);
void assoc(int *, int *, int *, MPI_Datatype *);
void addem(int *invec, int *inoutvec, int *len, MPI_Datatype * dtype)
{
int i;
for (i = 0; i < *len; i++)
inoutvec[i] += invec[i];
}
#define BAD_ANSWER 100000
/*
The operation is inoutvec[i] = invec[i] op inoutvec[i]
(see 4.9.4). The order is important.
Note that the computation is in process rank (in the communicator)
order, independent of the root.
*/
void assoc(int *invec, int *inoutvec, int *len, MPI_Datatype * dtype)
{
int i;
for (i = 0; i < *len; i++) {
if (inoutvec[i] <= invec[i]) {
int rank;
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
fprintf(stderr, "[%d] inout[0] = %d, in[0] = %d\n", rank, inoutvec[0], invec[0]);
inoutvec[i] = BAD_ANSWER;
} else
inoutvec[i] = invec[i];
}
}
int main(int argc, char **argv)
{
int rank, size, i;
int data;
int errors = 0;
int result = -100;
int correct_result;
MPI_Op op_assoc, op_addem;
MPI_Comm comm = MPI_COMM_WORLD;
MTest_Init(&argc, &argv);
MPI_Op_create((MPI_User_function *) assoc, 0, &op_assoc);
MPI_Op_create((MPI_User_function *) addem, 1, &op_addem);
/* Run this for a variety of communicator sizes */
MPI_Comm_rank(comm, &rank);
MPI_Comm_size(comm, &size);
data = rank;
correct_result = 0;
for (i = 0; i <= rank; i++)
correct_result += i;
MPI_Scan(&data, &result, 1, MPI_INT, MPI_SUM, comm);
if (result != correct_result) {
fprintf(stderr, "[%d] Error suming ints with scan\n", rank);
errors++;
}
MPI_Scan(&data, &result, 1, MPI_INT, MPI_SUM, comm);
if (result != correct_result) {
fprintf(stderr, "[%d] Error summing ints with scan (2)\n", rank);
errors++;
}
data = rank;
result = -100;
MPI_Scan(&data, &result, 1, MPI_INT, op_addem, comm);
if (result != correct_result) {
fprintf(stderr, "[%d] Error summing ints with scan (userop)\n", rank);
errors++;
}
MPI_Scan(&data, &result, 1, MPI_INT, op_addem, comm);
if (result != correct_result) {
fprintf(stderr, "[%d] Error summing ints with scan (userop2)\n", rank);
errors++;
}
result = -100;
data = rank;
MPI_Scan(&data, &result, 1, MPI_INT, op_assoc, comm);
if (result == BAD_ANSWER) {
fprintf(stderr, "[%d] Error scanning with non-commutative op\n", rank);
errors++;
}
MPI_Op_free(&op_assoc);
MPI_Op_free(&op_addem);
MTest_Finalize(errors);
return errors;
}
|
