forked from taskflow/taskflow
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathparallel_for.cpp
More file actions
69 lines (45 loc) · 1.48 KB
/
parallel_for.cpp
File metadata and controls
69 lines (45 loc) · 1.48 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
// This program demonstrates loop-based parallelism using:
// + STL-styled iterators
// + plain integral indices
#include <taskflow/taskflow.hpp>
#include <taskflow/algorithm/for_each.hpp>
// Procedure: for_each
void for_each(int N) {
tf::Executor executor;
tf::Taskflow taskflow;
std::vector<int> range(N);
std::iota(range.begin(), range.end(), 0);
taskflow.for_each(range.begin(), range.end(), [&] (int i) {
printf("for_each on container item: %d\n", i);
}, tf::StaticPartitioner());
executor.run(taskflow).get();
}
// Procedure: for_each_index
void for_each_index(int N) {
tf::Executor executor;
tf::Taskflow taskflow;
// [0, N) with a step size of 2
taskflow.for_each_index(0, N, 2, [] (int i) {
printf("for_each_index on index: %d\n", i);
});
executor.run(taskflow).wait();
// [0, N) with a step size of 2 using tf::IndexRange
tf::IndexRange<int> range(0, N, 2);
taskflow.for_each_index(range, [](tf::IndexRange<int> range) {
for(int i=range.begin(); i<range.end(); i+=range.step_size()) {
printf("for_each_index on index (subrange): %d\n", i);
}
});
executor.run(taskflow).wait();
}
// ----------------------------------------------------------------------------
// Function: main
int main(int argc, char* argv[]) {
if(argc != 2) {
std::cerr << "Usage: ./parallel_for num_iterations" << std::endl;
std::exit(EXIT_FAILURE);
}
for_each(std::atoi(argv[1]));
for_each_index(std::atoi(argv[1]));
return 0;
}