#!/usr/bin/perl

$timeout = shift || 10;

my $giga=2**30;
my $forks=1;

my $free;

my $memtotal = int(
	qx{ awk '/^(MemTotal):/ { sum += \$2} END { print sum }' /proc/meminfo }
    / 1024);

$total = 1;
$onemb = "x"x1048576;
do{
    $start = time;
    $free = int (
	qx{ awk '/^((Swap)?Cached|MemFree|Buffers):/ { sum += \$2} END { print sum }' /proc/meminfo }
	/ 1024);
    print "Free $free ";
    $total += int($free/100);
    $missing = $total - $sofar;
    for(1..$missing) {
	$buf{$forks}{$total}{$_} = $onemb;
    }
    $sofar = $total;
    $timediff = time - $start;

    print "Chunk size: $missing Time for swapping: $timediff seconds. Total memory used: $total\n";
    if($total * 1048576 > $forks * $giga) {
	if($pid=fork()) {
	    print "child spawn ",$forks,"\n";
	    wait;
	    print "child exit ",$forks,"\n";
	} else {
	    $buf{$forks}=1;
	    $forks++;
	}
    }
} until ($pid or $timediff>$timeout or $total > $memtotal);
print "exit ",$forks,"\n";