Looking at the linux example, here is a short snippet for getting shared, resident, and size on systems with /proc.

sub get_statm_info {
  $error = '';
  my $ref = {};

  if( ! open(_INFO,"</proc/$_[0]/statm") ){
    $error = "Couldn't open /proc/$_[0]/statm [$!]";
    return $ref;
  }
  my @info = split(/\s+/,<_INFO>);
  close(_INFO);

  ### these are all the props (skip some)
  # size resident shared trs lrs drs dt
  ###

  ### get the important ones
  $ref = {size     => $info[0] * 4,
          resident => $info[1] * 4,
          shared   => $info[2] * 4};

  return $ref;
}
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The values are in kb. If you don't care about shared, than the stat file is better:

sub get_stat_info {
  $error = '';
  my $ref = {};

  ### open and read the main stat file
  if( ! open(_INFO,"</proc/$_[0]/stat") ){
    $error = "Couldn't open /proc/$_[0]/stat [$!]";
    return $ref;
  }
  my @info = split(/\s+/,<_INFO>);
  close(_INFO);

  ### these are all the props (skip some)
  # pid(0) comm(1) state ppid pgrp session tty
  # tpgid(7) flags minflt cminflt majflt cmajflt
  # utime(13) stime cutime cstime counter
  # priority(18) timeout itrealvalue starttime vsize rss
  # rlim(24) startcode endcode startstack kstkesp kstkeip
  # signal(30) blocked sigignore sigcatch wchan
  ###

  ### get the important ones
  $ref = {utime  => $info[13] / 100,
          stime  => $info[14] / 100,
          cutime => $info[15] / 100,
          cstime => $info[16] / 100,
          vsize  => $info[22],
          rss    => $info[23] * 4};

  return $ref;
}
[download]

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