当可执行文件分叉另一个可执行文件时，不会创建gmon.out

Question

I am using gprof for profiling. But gmon.out is not created when I fork another executable inside the main executable which is compiled with option -pg. Any idea how to resolve it.

Answer 1

But gmon.out is not created when I fork another executable

It probably does. It simply has the same name as all the other gmon.out files. They just silently overwrite each other.

GNU, in all its infinite wisdom, recommends that each child process that you want to profile be executed in its own current directory. Use mkdir and chdir in your code as needed. Since gmon.out is written out as the process finishes, it is only necessary to chdir before calling exit .

I also recommend looking at valgrind . Among other nice things, it has its output files named something.somethingelse.$PID .

Answer 2

当您设置GMON_OUT_PREFIX=some_file_name环境变量时，gprof将为每个名为some_file_name.pid子进程创建其他gmon文件。