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
|
#include <map>
#include <iostream>
#include <mutex>
#include <cmath>
#include "paryfor.hpp"
int main(int argc, char** argv) {
// just test that we can compile
uint64_t todo_count = std::stoul(argv[1]);
int thread_count = std::stoi(argv[2]);
int chunk_size = std::stoi(argv[3]);
std::vector<uint64_t> count(thread_count);
std::mutex count_mutex;
paryfor::parallel_for<uint64_t>(
0, todo_count, thread_count, chunk_size,
[&](uint64_t i, int tid) {
// do some trivial work, so that we can see the effect of multithreading
for (uint64_t j = 0; j < 100; ++j) {
i *= exp(i) * exp(i+i) / log(i+i+i);;
}
++count[tid];
});
uint64_t c = 0;
for (int i = 0; i < thread_count; ++i) {
std::cout << "thread " << i << " " << count[i] << std::endl;
c += count[i];
}
if (c != todo_count) {
std::cerr << "error: count does not match that requested" << std::endl;
return 1;
}
return 0;
}
|
