gprof_test

gprof_test, a FORTRAN90 code which uses the gprof() program performance monitoring utility.

In order to use gprof() with a FORTRAN90 code, the user program must be compiled and linked with the -pg switch. For example, either


        gfortran -pg myprog.f90

or, in a two step process,


        gfortran -c -pg myprog.f90
        gfortran -pg myprog.o

When the resulting executable program is run, GPROF will silently monitor the program, and produce a report file called gmon.out. This report file is not user-readable. To see the information contained in the report, you have to run gprof and tell it the name of the executable program you just ran. A typical procedure, then, would be to issue the commands


        a.out            (to run your program)
        gprof a.out      (to have GPROF make the report)

GPROF can only report on code which has been compiled with the appropriate options. If your program calls routines from a precompiled library (which probably was NOT compiled with the -pg option!) then your report information will not include information about the time spent in those routines. GPROF's report will charge all such time to the higher level routine that called the library routine. If most of your execution time occurs in various library routines, then this fact may greatly reduce the value of GPROF's information.

For more information on how to use GPROF, type


        man gprof

Licensing:

The information on this web page is distributed under the MIT license.

Languages:

gprof_test examples are available in a C version and a C++ version and a FORTRAN90 version.

Source code:

gprof_test.sh, runs all the tests.
gprof_test.txt, the output file.

The LINPACK BENCHMARK code solves a linear system. This program was compiled, run, and analyzed with gprof(). Files you may copy include:

linpack_bench.f90, the source code.
linpack_bench.txt, the output from the LINPACK_BENCHMARK executable.

Last revised on 12 July 2020.