use strict;
use warnings;
use Test::Parser::Vmstat;
use Tie::File;

my @vmstat_data;
tie @vmstat_data, 'Tie::File', $ARGV[0] or die $!;
`sed '/[procs|swpd]/d' $ARGV[0] > /tmp/vmstat_intermidiate`;
open (my $in,  '<',  "/tmp/vmstat_intermidiate") or die "Can't read old file: $!";
open (my $out, '>', "/tmp/vmstat_log") or die "Can't write new file: $!";
print $out "$vmstat_data[0]\n";
print $out "$vmstat_data[1]\n";

while( <$in> )
        {
        print $out $_;
        }

close $out;
close $in;
`rm -rf /tmp/vmstat_intermidiate`;

my $parser = new Test::Parser::Vmstat
    or die "Couldn't create Test::Parser::Vmstat object\n";
my $logfile = '/tmp/vmstat_log';
$parser->parse($logfile)
    or die "Could not parse Vmstat log.\n";

print $parser->to_xml();

OUTPUT
procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu-----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
 1  0      0 50122424 234628 9616504    0    0     0    20    2    4  0  0 99  0  0
 0  0      0 50121664 234628 9616864    0    0     0     0 7813 5956  1  1 98  0  0
 1  0      0 50122252 234628 9616864    0    0     0   190 10727 6872  2  1 97  0  0
 0  0      0 50122092 234628 9616864    0    0     0   164 8645 6966  1  1 98  0  0

PERL SCRIPT OUTPUT

[root@r01mgt ~]# perl parse_vmstat.pl /tmp/vmstat
<vmstat>
</vmstat>