num_threads.c
2.86 KB
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
// RUN: %compile-run-and-check
#include <stdio.h>
#include <omp.h>
const int WarpSize = 32;
const int NumThreads1 = 1 * WarpSize;
const int NumThreads2 = 2 * WarpSize;
const int NumThreads3 = 3 * WarpSize;
const int MaxThreads = 1024;
int main(int argc, char *argv[]) {
int check1[MaxThreads];
int check2[MaxThreads];
int check3[MaxThreads];
int check4[MaxThreads];
for (int i = 0; i < MaxThreads; i++) {
check1[i] = check2[i] = check3[i] = check4[i] = 0;
}
int maxThreads1 = -1;
int maxThreads2 = -1;
int maxThreads3 = -1;
#pragma omp target map(check1[:], check2[:], check3[:], check4[:]) \
map(maxThreads1, maxThreads2, maxThreads3)
{
#pragma omp parallel num_threads(NumThreads1)
{
check1[omp_get_thread_num()] += omp_get_num_threads();
}
// API method to set number of threads in parallel regions without
// num_threads() clause.
omp_set_num_threads(NumThreads2);
maxThreads1 = omp_get_max_threads();
#pragma omp parallel
{
check2[omp_get_thread_num()] += omp_get_num_threads();
}
maxThreads2 = omp_get_max_threads();
// num_threads() clause should override nthreads-var ICV.
#pragma omp parallel num_threads(NumThreads3)
{
check3[omp_get_thread_num()] += omp_get_num_threads();
}
maxThreads3 = omp_get_max_threads();
// Effect from omp_set_num_threads() should still be visible.
#pragma omp parallel
{
check4[omp_get_thread_num()] += omp_get_num_threads();
}
}
// CHECK: maxThreads1 = 64
printf("maxThreads1 = %d\n", maxThreads1);
// CHECK: maxThreads2 = 64
printf("maxThreads2 = %d\n", maxThreads2);
// CHECK: maxThreads3 = 64
printf("maxThreads3 = %d\n", maxThreads3);
// CHECK-NOT: invalid
for (int i = 0; i < MaxThreads; i++) {
if (i < NumThreads1) {
if (check1[i] != NumThreads1) {
printf("invalid: check1[%d] should be %d, is %d\n", i, NumThreads1, check1[i]);
}
} else if (check1[i] != 0) {
printf("invalid: check1[%d] should be 0, is %d\n", i, check1[i]);
}
if (i < NumThreads2) {
if (check2[i] != NumThreads2) {
printf("invalid: check2[%d] should be %d, is %d\n", i, NumThreads2, check2[i]);
}
} else if (check2[i] != 0) {
printf("invalid: check2[%d] should be 0, is %d\n", i, check2[i]);
}
if (i < NumThreads3) {
if (check3[i] != NumThreads3) {
printf("invalid: check3[%d] should be %d, is %d\n", i, NumThreads3, check3[i]);
}
} else if (check3[i] != 0) {
printf("invalid: check3[%d] should be 0, is %d\n", i, check3[i]);
}
if (i < NumThreads2) {
if (check4[i] != NumThreads2) {
printf("invalid: check4[%d] should be %d, is %d\n", i, NumThreads2, check4[i]);
}
} else if (check4[i] != 0) {
printf("invalid: check4[%d] should be 0, is %d\n", i, check4[i]);
}
}
return 0;
}