LINPACK_BENCH is a FORTRAN77 program which carries out the LINPACK Benchmark.
The LINPACK benchmark is a test problem used to rate the performance of a computer on a simple linear algebra problem.
The test problem requires the user to set up a random dense matrix A of size N = 1000, and a right hand side vector B which is the product of A and a vector X of all 1's. The first task is to compute an LU factorization of A. The second task is to use the LU factorization to solve the linear system
A * X = B.
The number of floating point operations required for these two tasks is roughly
ops = 2 * N*N*N / 3 + 2 * N * N,therefore, the "MegaFLOPS" rating, or millions of floating point operations per second, can be found as
mflops = ops / ( cpu * 1000000 ).
On a given computer, if you run the benchmark for a sequence of increasing values of N, the behavior of the MegaFLOPS rating will vary as you pass through three main zones of behavior:
Language | Precision | Type | Machine | Comment | MegaFLOPS |
---|---|---|---|---|---|
Fortran77 | Single | Real | DHCP95 (Apple G5) | gfortran | 221 |
Fortran77 | Double | Real | DHCP95 (Apple G5) | gfortran | 202 |
The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.
LINPACK_BENCH is available in a C version and a C++ version and a FORTRAN77 version and a FORTRAN90 version and a JAVA version and a MATLAB version.
LINPACK, a FORTRAN90 library which supplies the solvers used by LINPACK_BENCH.
MATMUL, a FORTRAN77 program which is an interactive matrix multiplication benchmark program.
MDBNCH, a FORTRAN77 program which is a benchmark code for a molecular dynamics calculation.
MEMORY_TEST, a FORTRAN90 program which declares and uses a sequence of larger and larger vectors, to see how big a vector can be used on a given machine and compiler.
MXM, a FORTRAN77 program which sets up a matrix multiplication problem A=B*C of arbitrary size, and compares the time required for IJK, IKJ, JIK, JKI, KIJ and KJI orderings of the loops.
NAS, a FORTRAN77 program which runs the NASA kernel benchmark.
SUM_MILLION, a FORTRAN77 program which sums the integers from 1 to 1,000,000, as a demonstration of how to rate a computer's speed;
TIMER, a FORTRAN77 example which demonstrates how to measure CPU time or elapsed time.
LINPACK_BENCH_S is the single precision version:
LINPACK_BENCH_D is the double precision version:
This is the list of routines for the double precision version of the benchmark program. The single precision names are similar.
You can go up one level to the FORTRAN77 source codes.