EP_SERIAL
NAS Parallel Benchmark EP, Serial Version, FORTRAN77

EP_SERIAL is a FORTRAN77 program which is a serial implementation of the NAS Parallel Benchmark known as EP ("embarassingly parallel").

The NAS Parallel Benchmarks are "paper and pencil" specifications; that is, the proposers have laid down what the programs must do algorithmically, but only very general rules about computer language implementation have been given. Thus, a user or vendor has enormous freedom in implementing the benchmark program in a way that is optimal for a given architecture or parallel programming scheme.

As a starting point for implementors, the proposers have supplied certain initial versions of the benchmark programs.

This directory contains material derived from one such initial benchmark code. Persons interested in the original source of the benchmark codes should NOT work from this material, but should go to the NAS Parallel Benchmark website directly!

The benchmark programs are available in SERIAL, MPI and OPEN_MP versions, and in a sequence of "classes" of increasing size: S, W, A, B, C, D and E.

Statistics for classes S, A, and B, are available, as run on one processor of a Cray Y-MP, using a FORTRAN77 version of the program.

Class	Size	Memory (Mw)	Time (sec)	MFLOPS
S	2^24	0.1	11	120
A	2^28	1.0	151	147
B	2^30	18.0	512	197

Statistics for classes S, W, A, B, and C are available, as run on an Apple PowerPC G5, using this SERIAL FORTRAN77 version of the program.

Class	Size	Memory (Mw)	Time (sec)	MFLOPS
S	2^24	0.1	4.7	7
W	2^25	?	9.3	7
A	2^28	1.0	74	7
B	2^30	18.0	304	7
C	2^32	?	1199	7

This directory contains the serial version of the benchmark, along with include files that allow it to run in some of the smaller sizes.

The web site for the NAS Parallel Benchmarks is http://www.nas.nasa.gov/Resources/Software/npb.html.

Languages:

EP_SERIAL is available in a FORTRAN77 version and a FORTRAN90 version.

Related Data and Programs:

BT_SERIAL, a FORTRAN77 program which runs the serial version of the NAS Parallel Benchmark known as "BT" (block tridiagonal solver for 3D PDE).

CG_SERIAL, a FORTRAN77 program which is a serial version of the NAS Parallel Benchmark CG (conjugate gradient solver).

FIRE_SERIAL, a FORTRAN77program which simulates a forest fire over a rectangular array of trees, starting at a single random location. It is intended as a starting point for the development of a parallel version.

IS_SERIAL, a C program which is a serial version of the NAS Parallel Benchmark IS (integer sort).

LINPACK_BENCH, a FORTRAN77 program which measures the time taken by LINPACK to solve a particular linear system.

MATMUL, a FORTRAN77 program which is an interactive matrix multiplication benchmark.

MDBNCH, a FORTRAN77 program which is a benchmark molecular simulation calculation.

MG_SERIAL, a FORTRAN77 program which a serial version of the NAS Parallel Benchmark MG (MultiGrid).

MXM_SERIAL, a FORTRAN77 program which sets up a matrix multiplication problem A=B*C, intended as a starting point for implementing a parallel version.

POISSON_SERIAL, a FORTRAN77 program which computes an approximate solution to the Poisson equation in a rectangle, and is intended as the starting point for the creation of a parallel version.

PRIME_SERIAL, a FORTRAN77 program which counts the number of primes between 1 and N, intended as a starting point for the creation of a parallel version.

SEARCH_SERIAL, a FORTRAN77 program which searches the integers from A to B for a value J such that F(J) = C. this version of the program is intended as a starting point for a parallel approach.

SUBSET_SUM_SERIAL, a FORTRAN77 program which seeks solutions of the subset sum problem, in which it is desired to find a subset of a set of integers which has a given sum; this version of the program is intended as a starting point for a parallel approach.

Reference:

1. David Bailey, Eric Barszcz, John Barton, D Browning, Robert Carter, Leonardo Dagum, Rod Fatoohi, Samuel Fineberg, Paul Frederickson, Thomas Lasinski, Robert Schreiber, Horst Simon, V Venkatakrishnan, Sisira Weeratunga,
   The NAS Parallel Benchmarks,
   International Journal of High Performane Computing Applications,
   Volume 5, Number 3, September 1991, pages 63-73.

Source Code:

• ep_serial.f, the source code.
• wtime.c, a small routine used for timing.
• wtime.h, an include file for WTIME.

Examples and tests:

EP_SERIAL_S runs the benchmark in serial mode with problem size S.

• nbparams_S.h, the include file.
• ep_serial_S.sh, a script which compiles the code.
• ep_serial_S_output.txt, the output file.

EP_SERIAL_W runs the benchmark in serial mode with problem size W.

• nbparams_W.h, the include file.
• ep_serial_W.sh, a script which compiles the code.
• ep_serial_W_output.txt, the output file.

EP_SERIAL_A runs the benchmark in serial mode with problem size A.

• nbparams_A.h, the include file.
• ep_serial_A.sh, a script which compiles the code.
• ep_serial_A_output.txt, the output file.

EP_SERIAL_B runs the benchmark in serial mode with problem size B.

• nbparams_B.h, the include file.
• ep_serial_B.sh, a script which compiles the code.
• ep_serial_B_output.txt, the output file.

EP_SERIAL_C runs the benchmark in serial mode with problem size C.

• nbparams_C.h, the include file.
• ep_serial_C.sh, a script which compiles the code.
• ep_serial_C_output.txt, the output file.

You can go up one level to the FORTRAN77 source codes.