用-pg编译的gcc不会产生gprof所需的二进制文件

Question

I'm running into a little problem and require some assistance. I would like to run gprof on some OpenMP and MPI hybrid code as a part of my testing. I understand that gprof relies on a binary file which is created when you compile gcc (or mpicc) with a -pg switch.

I have tried adding this switch and my compiling succeeds (as in no errors are reported), however, the binary file is not created but the executable is created as normal. I have also tried doing this on much simpler code, which utilizes pthreads, with the same result.

Please examine the below and let me hear your thoughts.

gcc -pg --std=gnu99 -pthread -Wall -o pthreadsv0 pthreads.c

Answer 1

I suspect that binary file you mention is in fact the profile data file ( gmon.out ) and it is generated when you run your program (which has to be compiled with the -pg flag). Just execute your program and see if a gmon.out file is there.

Answer 2

The gprof information is created when you execute the program after you compile with the -pg option. Try running your program. (You're profiling (gprof) the execution of the program)

The -pg compile option adds the necessary logic to create the profiling information when the program is executed. Executing the program, several times if desired or needed, allows the 'instrumented' code to write the data describing the logic flow and timing to the gmon.out file.

Answer 3

Encountered the same problem. The problem arose because I was shutting the program's execution with Ctrl-C instead of a proper exit (closing the GUI window in my case).