[3] I didn't instrument the build process; as can be seen in the
    scripts, I just relied on:

        ps --sort=-vsz p $pids | head 1

    $pids include the emacs session in which I was running make; this
    session was masking basically everything other than the ELC+ELN
    processes.

    Also, the sampling step being 30 seconds, a lot of interesting
    patterns may not have been recorded.

    Overall these scripts are an exercise in How Not To Collect Data 😒.