You mentioned Determining memory usage of a process..., which lists a second answer (for Linux). This would work without installing additional modules. You simply have to find out wether your ps has different options.

I'm on Windows, and based on Re^7: memory use array vs ref to array (or more probably Re: time and mem usage of pgm by the same author) I have scripts with

END {
    system qq(tasklist /v /fo LIST /fi "PID eq $$")
}
[download]

and

END {
    system qq(wmic  PROCESS where "processid=$$" get * /FORMAT:LIST)
}
[download]

Perhaps one of these works for you?