#!/usr/local/bin/perl
#
# requires textproc/p5-XML-LibXML
#
use warnings;

use XML::LibXML;

my $filename = 'vmstatm.xml';

my %dict;
my $offset = 10;

while (1) {
	print scalar localtime() . "\n";
	system("/usr/bin/vmstat -m --libxo xml >$filename"); 
	$doc = XML::LibXML->load_xml(location => $filename); 
	foreach my $id ( $doc->findnodes('//memory')) {
		my $name=$id->findvalue('type');
		my $used=$id->findvalue('memory-use');
		if (exists $dict{$name}) {
			my $v0=$dict{$name} + $offset;

			if ($v0 < $used) {
				print "$name: $v0 => $used \n";
				$dict{$name}=$used;
			}
		} else {
			$dict{$name}=$used;
		}
	}
	print "------------------------\n" ;

	sleep(5);
}