How do I use OpenMP in C++?

How do I use OpenMP in C++?

OpenMP is a parallel programming model that can be used in C++ to improve performance. You can start by including the OpenMP header with #include <omp.h>.

What are the basic directives I should know?

The basic directives include #pragma omp parallel, #pragma omp for, and #pragma omp sections. These help in parallelizing loops and sections of code.

Can you give me an example of a parallel for loop?

Sure! Here's a simple example:

#include <omp.h>
#include <iostream>

int main() {
    #pragma omp parallel for
    for (int i = 0; i < 10; i++) {
        std::cout << "Thread " << omp_get_thread_num() << " processes i = " << i << std::endl;
    }
    return 0;
}

How do I compile a program with OpenMP?

You can compile your program with OpenMP support by using the -fopenmp flag with g++. For example: g++ -fopenmp your_program.cpp -o your_program.