MXV
Matrix Vector Multiplication Timings

MXV is a FORTRAN90 program which sets up several matrix vector multiplication problems y=A*x, and carries them out using

• Nested DO I, DO J loops;
• Nested DO J, DO I loops;
• the MATMUL FORTRAN90 intrinsic function;

The user is allowed to specify M and N, the number of matrix rows and columns.

Usage:

mxv m n

m

the number of matrix rows;

n

the number of matrix columns;

Sample Results:

          M        N       FLOP  doIdoJ  doJdoI  MATMUL

         10       10        100       8      11       3

         10      100      1,000      27      29      32
        100       10      1,000      23      31      32

         10    1,000     10,000      35      33     172
        100      100     10,000      31      36     200
      1,000       10     10,000      42      54     277

         10   10,000    100,000      18      33     159
     10,000       10    100,000      25      34     176

         10  100,000  1,000,000      16      32     142
        100   10,000  1,000,000       6      37     174
      1,000    1,000  1,000,000      17      40     234
     10,000      100  1,000,000      28      37     171
    100,000       10  1,000,000      24      33      88
      

Licensing:

The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.

Related Data and Programs:

F90_INTRINSICS is a directory of FORTRAN90 programs which illustrate the use of FORTRAN90 intrinsic functions.

LINPACK_BENCH is a FORTRAN90 program which measures the time needed to factor and solve a "large" (N=1000) dense linear system of equations, and is used as a benchmark.

MATMUL is a FORTRAN90 program which is an interactive matrix multiplication benchmark program.

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

MXV is available in a C version and a C++ version and a FORTRAN77 version and a FORTRAN90 version and a MATLAB version.

MXV_OPEN_MP is a FORTRAN90 program which compares the performance of plain vanilla Fortran and the FORTRAN90 intrinsic routine MATMUL, for the matrix multiplication problem y=A*x, with and without parallelization by OpenMP.

SUM_MILLION is a FORTRAN90 program which sums the integers from 1 to 1,000,000, as a demonstration of how to rate a computer's speed;

TIMER is a directory of FORTRAN90 programs which demonstrate how to compute CPU time or elapsed time.

Reference:

1. John Burkardt, Paul Puglielli,
   Pittsburgh Supercomputing Center,
   MATMUL: An Interactive Matrix Multiplication Benchmark

Source Code:

• mxv.f90, the source code.
• mxv.csh, commands to compile and link the source code.

List of Routines:

• MAIN is the main program for MXV.
• MATGEN generates a random matrix A and vector X.
• MXV_MATMUL computes y = A * x, using the FORTRAN90 MATMUL function.
• MXV_DOIDOJ computes y = A * x, using DO I, DO J loops.
• MXV_DOJDOI computes y = A * x, using DO J, DO I loops.
• S_TO_I4 reads an I4 from a string.
• TIMESTAMP prints the current YMDHMS date as a time stamp.

You can go up one level to the FORTRAN90 source codes.