functions_openmp, a C code which demonstrates some features of some of the OpenMP library functions.
Some of the most useful OpenMP library functions include:
|dynamic_truefalse =||omp_get_dynamic ( )|
|t_max =||omp_get_max_threads ( )|
|nested_truefalse =||omp_get_nested ( )|
|p_num =||omp_get_num_procs ( )|
|t_num =||omp_get_num_threads ( )|
|t_id =||omp_get_thread_num ( )|
|wtime =||omp_get_wtime ( )|
|in_parallel_truefalse =||omp_in_parallel ( )|
|omp_set_dynamic ( dynamic_truefalse )|
|omp_set_nested ( nested_truefalse )|
|omp_set_num_threads ( t_num )|
This code demonstrates how some of these functions are used, and how they behave in parallel and non-parallel regions.
The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.
functions_openmp is available in a C version.
DIJKSTRA_OPENMP, a C code which uses OpenMP to parallelize a simple example of Dijkstra's minimum distance algorithm for graphs.
FFT_OPENMP, a C code which demonstrates the computation of a Fast Fourier Transform in parallel, using OpenMP.
HEATED_PLATE_OPENMP, a C code which solves the steady (time independent) heat equation in a 2D rectangular region, using OpenMP to run in parallel.
HELLO_OPENMP, a C code which prints out "Hello, world!" using the OpenMP parallel programming environment.
IMAGE_DENOISE_OPENMP, a C code which applies simple filtering techniques to remove noise from an image, carrying out the operation in parallel using OpenMP.
JACOBI_OPENMP, a C code which illustrates the use of the OpenMP application program interface to parallelize a Jacobi iteration solving A*x=b.
julia_set_openmp, a C code which produces an image of a Julia set, using OpenMP to carry out the computation in parallel.
MANDELBROT_OPENMP, a C code which generates an ASCII Portable Pixel Map (PPM) image of the Mandelbrot set, using OpenMP for parallel execution.
MD_OPENMP, a C code which carries out a molecular dynamics simulation in parallel, using OpenMP.
MULTITASK_OPENMP, a C code which demonstrates how to "multitask", that is, to execute several unrelated and distinct tasks simultaneously, using OpenMP for parallel execution.
MXM_OPENMP, a C code which computes a dense matrix product C=A*B, using OpenMP for parallel execution.
openmp_test, C codes which use the OpenMP application program interface for carrying out parallel computations in a shared memory environment.
POISSON_OPENMP, a C code which computes an approximate solution to the Poisson equation in a rectangle, using the Jacobi iteration to solve the linear system, and OpenMP to carry out the Jacobi iteration in parallel.
PRIME_OPENMP, a C code which counts the number of primes between 1 and N, using OpenMP for parallel execution.
QUAD_OPENMP, a C code which approximates an integral using a quadrature rule, and carries out the computation in parallel using OpenMP.
QUAD2_OPENMP, a C code which approximates a multidimensional integral using a quadrature rule. The quadrature computation is done with OpenMP.
QUAD2D_OPENMP, a C code which estimates an integral over a 2D rectangular domain by using an averaging technique, and uses OpenMP to carry out the calculation in parallel.
RANDOM_OPENMP, a C code which illustrates how a parallel program using OpenMP can generate multiple distinct streams of random numbers.
SATISFY_OPENMP, a C code which demonstrates, for a particular circuit, an exhaustive search for solutions of the circuit satisfiability problem, using OpenMP for parallel execution.
SCHEDULE_OPENMP, a C code which demonstrates the default, static, and dynamic methods of "scheduling" loop iterations in OpenMP to avoid work imbalance.
SGEFA_OPENMP, a C code which reimplements the SGEFA/SGESL linear algebra routines from LINPACK for use with OpenMP.
SUPERLU_OPENMP, C codes which illustrate the use of the SUPERLU_OPENMP library, a version of SUPERLU compiled with the OpenMP parallel programming interface, for the fast direct solution of large sparse systems of linear equations.
ZIGGURAT_OPENMP, a C code which demonstrates how the ZIGGURAT library can be used to generate random numbers in an OpenMP parallel program.