How effective is Open MP when used with Fortran 90?

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Open MP is highly effective when used with Fortran 90. Fortran has been updated to include parallel processing features, and Open MP is one of the most popular ways to use those features. Open MP provides a simple and portable way of using shared-memory parallelism in Fortran programs. By using Open MP with Fortran, developers can take advantage of parallelism to improve the performance of their applications without sacrificing portability or maintainability. The performance gains achieved by using Open MP with Fortran depend on several factors, including the size of the problem, the number of processors, and the efficiency of the parallel algorithm. However, in general, Open MP can significantly improve the performance of Fortran programs by exploiting parallelism.