Often in High Performance Computing one needs to know about the various memory metrics of a given program with the peak memory usage probably being the most important one. While the getrusage(2) syscall provides some of that information, it’s use in Fortran programs is far from optimal and there are lots of metrics that are not exposed by it.
On Linux one could simply parse the /proc/PID/status file. Being a simple text file it could easily be processed entirely with the built-in Fortran machinery as shown in the following recipe: