Here is a short program in C++ 11 to see how threads are running on different CPU cores
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32 | #include <thread>
#include <mutex>
#include <iostream>
#include <vector>
std::mutex mu;
unsigned long GetCurrentProcessorNumber() {
int CPUInfo[4];
__cpuid(CPUInfo, 1);
return (unsigned)CPUInfo[1] >> 24;
}
void function(int i) {
mu.lock();
std::cout << "Thread Number" << i << " : is Running on CPU " << GetCurrentProcessorNumber() << std::endl;
mu.unlock();
}
int main() {
auto num_threads = 50;
std::vector<std::thread> threads(num_threads);
for (unsigned i = 0; i < num_threads; ++i) {
threads[i] = std::thread(function,i);
}
for (auto& t : threads) {
t.join();
}
system("pause");
return 0;
}
|
The Output is :
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