My favorite tool for this is Benchmark::Timer.
use Benchmark::Timer;
my $T = new Benchmark::Timer;
$T->start( 'Outer' );
for( 1 .. 1000 ) {
$T->start( 'Inner' );
# Request a 50 millisec delay to simulate command
select undef, undef, undef, 0.05;
$T->stop( 'Inner' )
};
$T->stop( 'Outer' );
$T->report;
1 trial of Outer (199.094s total)
1000 trials of Inner (62.500s total), 62.500ms/trial
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