#!/usr/bin/perl
$|=1;   #disable output buffering, this is necessary for proper output through pipe
use strict;

my $str='abcdefgh'.'efghefgh';
my $imax=1024/length($str)*1024*4;      # 4mb

my $starttime=time();
print "exec.tm.sec\tstr.length\n";

my $gstr='';
my $i=0;

while($i++ < $imax+1000){   #adding 1000 iterations to delay exit. This will allow to capture memory usage on last step
    $gstr.=$str;
    $gstr=~s/efgh/____/g;
    my $lngth=length($str)*$i;  ##  my $lngth=length($gstr);    # Perhaps that would be a slower way
    print time()-$starttime,"sec\t\t",$lngth/1024,"kb\n" unless $lngth % (1024*256);    #print out every 256kb
}
#print $gstr,"\n";