gprof_test

gprof_test, is a directory of FORTRAN77 programs which demonstrate how the GPROF performance monitor can be used to monitor the performance of a FORTRAN77 program and produce a variety of reports.

In order to use GPROF with a FORTRAN77 program, the user program must be compiled and linked with the -pg switch. For example, either


        gfortran -pg myprog.f

or, in a two step process,


        gfortran -c -pg myprog.f
        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 computer code and data files described and made available on this web page are distributed under the GNU LGPL license.

Languages:

GPROF examples are available in a C version and a C++ version and a FORTRAN77 version and a FORTRAN90 version.

Examples and Tests:

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

linpack_bench.f, the source code.
linpack_bench_gprof.sh, commands to compile, load, run and analyze the code.
linpack_bench_output.txt, the output from the LINPACK_BENCHMARK executable.
linpack_bench_gprof_output.txt, the performance report produced by GPROF.

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

Last revised on 09 March 2008.