MD_OPENMP, a C code which carries out a molecular dynamics simulation, using OpenMP for parallel execution.
On an Apple PowerPC G5 with two processors, the following results were observed for 400 steps and 1000 particles:
| Threads | Time |
|---|---|
| 1 | 179.632 secconds |
| 2 | 90.548 seconds |
| 4 | 95.303 seconds |
In the BASH shell, the program could be run with 2 threads using the commands:
export OMP_NUM_THREADS=2
./md_openmp
The computer code and data files described and made available on this web page are distributed under the MIT license
MD_OPENMP is available in a C version and a C++ version and a FORTRAN90 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.
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.
MD, a C code which carries out a molecular dynamics simulation, and is intended as a starting point for implementing an OpenMP parallel version.
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.
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 satisfy 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.