dijkstra_openmp, a C code which uses the OpenMP application program interface by implementing Dijkstra's minimum graph distance algorithm.
The program is an interesting example, because it does not involve parallelization of a loop. Instead, a parallel region is defined, and the nodes of the graph are divided up among the threads. The resulting parallel algorithm naturally requires some of the more advanced OpenMP directives, including critical, single and barrier, in order to work correctly.
The actual graph that is analyzed is very small (6 nodes), but of course the same algorithm would work for larger graphs. The point is rather to see how the OpenMP directives can be put together correctly.
The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.
dijkstra_openmp is available in a C version and a C++ version and a FORTRAN90 version.
DIJKSTRA, a C code which runs 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.
FUNCTIONS_OPENMP, a C code which demonstrates the behavior of a few of the OpenMP library functions.
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 fractal set, using OpenMP for parallel execution.
MD_OPENMP, a C code which carries out a molecular dynamics simulation 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.
PTHREADS, C codes which illustrate the use of the POSIX thread library to carry out parallel program execution.
QUAD_OPENMP, a C code which approximates an integral using a quadrature rule, and carries out the computation in parallel using OpenMP.
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.
ZIGGURAT_OPENMP, a C code which demonstrates how the ZIGGURAT library can be used to generate random numbers in an OpenMP parallel program.