imapsync/W/learn/memory_consumption

#!/usr/bin/perl

use warnings;
use strict;
use English;
use Mail::IMAPClient;

$ARGV[3] or die "usage: $0 host user password folder\n";

my $host     = $ARGV[0];
my $user     = $ARGV[1];
my $password = $ARGV[2];
my $folder   = $ARGV[3];

my $imap = Mail::IMAPClient->new();
$imap->Debug(0);
$imap->Server($host);
$imap->connect() or die;
$imap->User($user);
$imap->Password($password);
$imap->login() or die;
$imap->Uid(1);
$imap->Peek(1);
$imap->Clear(1);

#print map {"$_\n"} $imap->folders();

$imap->select($folder) or die;
my @msgs = $imap->messages or die "Could not messages: $@\n";
print "@msgs\n";
print memory_consumption();
foreach my $msg (@msgs) {
	my $size = $imap->size($msg);
	print "message size of $msg = $size bytes\n";
	my $string = $imap->message_string($msg);
	print memory_consumption();
	$imap->append('INBOX.Trash', $string);
	print memory_consumption();
}
$imap->close();
print memory_consumption();


sub memory_consumption {

	my @PID = (@_) ? @_ : ($PROCESS_ID);
	my $val;
	
	my ($package, $filename, $line, $subroutine) = caller(0);
	$val = "$package $filename line $line: ";
	my @ps = qx{ ps o vsz @PID };
	my $vsz = $ps[1];
	chomp($vsz);
	$val .= $vsz * 1024 . " bytes\n";
	#$val .= '-' x 80 . "\n";
	return($val);
}