#!/usr/bin/perl

use Time::HiRes qw( usleep ualarm gettimeofday tv_interval);

open(RANDOM, "/dev/random");
for ($i=0;$i<512; $i++) {
        $t0 = [gettimeofday];
        sysread(RANDOM, $buf, 25600);
	$elapsed= tv_interval($t0);
	printf "%d %f\n", $i, $elapsed;
}
close(RANDOM);