JACOBI_OPENMP is a C program which illustrates the use of the OpenMP application program interface to parallelize a Jacobi iteration solving A*x=b.
Each step of the Jacobi iteration produces a vector xnew. The i-th entry of xnew is found by ``solving'' the i-th linear equation for the i-th variable. This operation can be done in parallel. It is a little more complicated to compute the maximum difference between the old and new x values, and to compute the maximum residual, but these can be done.
The example uses a standard -1,2,-1 matrix which has very slow convergence. Here, the point is not so much to get the answer, but to show that the process can be speeded up by employing OpenMP.
The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.
JACOBI_OPENMP is available in a C version and a C++ version and a FORTRAN90 version.
DIJKSTRA_OPENMP, a C program which uses OpenMP to parallelize a simple example of Dijkstra's minimum distance algorithm for graphs.
FFT_OPENMP, a C program which demonstrates the computation of a Fast Fourier Transform in parallel, using OpenMP.
FUNCTIONS_OPENMP, a C program which demonstrates the behavior of a few of the OpenMP library functions.
HEATED_PLATE_OPENMP, a C program which solves the steady (time independent) heat equation in a 2D rectangular region, using OpenMP to run in parallel.
HELLO_OPENMP, a C program which prints out "Hello, world!" from each OpenMP thread.
IMAGE_DENOISE_OPENMP, a C library which applies simple filtering techniques to remove noise from an image, carrying out the operation in parallel using OpenMP.
JACOBI, a C library which implements the Jacobi iteration for solving symmetric positive definite (SPD) systems of linear equations.
JULIA_OPENMP, a C program which produces an image of a Julia set, using OpenMP to carry out the computation in parallel.
MANDELBROT_OPENMP, a C program which generates an ASCII Portable Pixel Map (PPM) image of the Mandelbrot fractal set, using OpenMP for parallel execution.
MD_OPENMP, a C program which carries out a molecular dynamics simulation using OpenMP.
MULTITASK_OPENMP, a C program which demonstrates how to "multitask", that is, to execute several unrelated and distinct tasks simultaneously, using OpenMP for parallel execution.
MXM_OPENMP, a C program which computes a dense matrix product C=A*B, using OpenMP for parallel execution.
OPENMP, C programs which illustrate the use of the OpenMP application program interface for carrying out parallel computations in a shared memory environment.
OPENMP_RCC, C programs which illustrate how a FORTRAN90 program, using OpenMP, can be compiled and run in batch mode on the FSU High Performance Computing (HPC) cluster operated by the Research Computing Center (RCC).
POISSON_OPENMP, a C program 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 program which counts the number of primes between 1 and N, using OpenMP for parallel execution.
QUAD_OPENMP, a C program which approximates an integral using a quadrature rule, and carries out the computation in parallel using OpenMP.
QUAD2D_OPENMP, a C program which applies a product quadrature rule to estimate an integral over a 2D rectangle, using OpenMP for parallel execution.
RANDOM_OPENMP, a C program which illustrates how a parallel program using OpenMP can generate multiple distinct streams of random numbers.
SATISFY_OPENMP, a C program 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 program which demonstrates the default, static, and dynamic methods of "scheduling" loop iterations in OpenMP to avoid work imbalance.
SGEFA_OPENMP, a C program which reimplements the SGEFA/SGESL linear algebra routines from LINPACK for use with OpenMP.
SUPERLU_OPENMP, C programs which illustrate how to use the SUPERLU library with the OpenMP parallel programming interface, which applies a fast direct solution method to solve sparse linear systems, by James Demmel, John Gilbert, and Xiaoye Li.
ZIGGURAT_OPENMP, a C program which demonstrates how the ZIGGURAT library can be used to generate random numbers in an OpenMP parallel program.
You can go up one level to the C source codes.