Tutorial by Topics: openmp

OpenMP (Open MultiProcessing) is a parallel programming model based on compiler directives which allows application developers to incrementally add parallelism to their application codes. OpenMP API specification for parallel programming provides an application programming interface (API) that su...

All 4 version are valid, but they exemplify different aspects of a reduction. By default, the first construct using the reduction clause must be preferred. This is only if some issues are explicitly identified that any of the 3 alternatives might be explored.

ClauseParameterprivateComma-separated list of private variablesfirstprivateLike private, but initialized to the value of the variable before entering the looplastprivateLike private, but the variable will get the value corresponding to the last iteration of the loop upon exitreductionreduction oper...

A common pitfall is to believe that all threads of a parallel region should instantiate (create) tasks but this is not typically the case unless you want to create as many tasks as the number of threads times the number of elements to process. Therefore, in OpenMP task codes you'll find something ...

This topic covers the basics of concurrency in C++ using OpenMP. OpenMP is documented in more detail in the OpenMP tag. Parallelism or concurrency implies the execution of code at the same time. OpenMP does not require any special headers or libraries as it is a built-in compiler feature. How...