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openmp

A collection of 6 posts

Software Engineering

Get introduced to using OpenMP to parallelize a C++ code

In this article, we will take a look at some of the basic ways we can use OpenMP to parallelize a C++ code. OpenMP is a feature of the compiler like GCC

Subhajit Mondal Subhajit Mondal
openmp

Install OpenMP from source

In this guide, we will walk you through the installation steps of OpenMP from source. Open Multi-Processing is a library that is used to make programs execute in a parallel fashion. It supports multi-platform shared memory multiprocessing programming in C, C++, and Fortran on most platforms

OpenGenus Foundation OpenGenus Foundation
openmp

OpenMP clauses: firstprivate, lastprivate, ordered

There are three basic OpenMP clauses namely firstprivate, lastprivate and ordered. firstprivate clause is used to initialize a variable from the serial part of the code and private clause doesn't initialize the variable

OpenGenus Foundation OpenGenus Foundation
openmp

Basic OpenMP functions

There are 3 basic functions in OpenMP namely omp_get_thread_num, omp_set_num_threads (nthreads) and omp_get_num_threads. We have given a basic C/ C++ example to demonstrate the use of the function and the observation of the output as well

OpenGenus Foundation OpenGenus Foundation
openmp

When to use OpenMP directives?

If some section of your code can be parallelized and you have more than one processor, you should definitely speed up the execution of your program using OpenMP directives. We have demonstrated how to use Amdahl's law to calculate the expected speed up and profiling to find which section takes time

OpenGenus Foundation OpenGenus Foundation
openmp

Introduction to OpenMP

OpenMP is an open source library which is used for multi-threaded parallel processing and shared-memory multi-processor (core) computers. In OpenMP, part of program is a single thread and part is multi-threaded We have given advantages, disadvantages, industry use example, approach of OpenMP library

OpenGenus Foundation OpenGenus Foundation
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