GPROF 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
The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.
GPROF examples are available in a C version and a C++ version and a FORTRAN77 version and a FORTRAN90 version.
The LINPACK BENCHMARK code solves a linear system. This program was compiled, run, and analyzed with GPROF. Files you may copy include:
You can go up one level to the FORTRAN77 source codes.