My application is cgi script. I need at least milli-second. My code is very simple. At case of times(). I use: 

$start = [times()];
...somecode...
$end = [times()];


$time_diff =($start->[0] + $start->[1]) - ($end->[0] + $end->[1]);

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at case of Time::HiRes 
$start=[gettimeofday];
...somecode...
$end = [gettimeofday];

$time_diff = tv_interval($start, $end);

[download]
But if real <=> sys+user, my first case will be always lower that at case 2

In reply to Re^2: Timer implementation by bash
in thread Timer implementation by bash

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