:) whoops 

use File::Which qw/ which /;
our $GOTPS = which('ps');

[download]

I've used the PID reported by the script in another terminal and ran:

groan :) thats too much lines 

#!/usr/bin/perl --
use warnings;
use strict;
use feature qw{ say };
use File::Which qw/ which /;
our $GOTPS = which('ps');

say $$;
psMem();

my $file = shift;
open my $FH, '<', $file or die $!;

my $string;

{ local $/; $string = <$FH> };
say length $string;

psMem(); 

undef $string;
psMem(); 

seek $FH, 0, 0;
$string = do { local $/; <$FH> };
say length $string;

psMem();
undef $string;
psMem(); 


sub psMem {
    my( $pid ) = @_;
    my @lines = qx{$GOTPS   -o vsize,rss     -p $pid };
    chomp @lines;
    foreach my $line (@lines) {
        my ( $vsize, $rss) = split /\s+/, $line;
        return "VM: $vsize   RSS: $rss  ";
    }
    return;
}

[download]

In reply to Re^9: memory use array vs ref to array by Anonymous Monk
in thread memory use array vs ref to array by dkhosla1

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.