G'day Chris,

Perhaps you're looking for something like this:

#!/usr/bin/env perl -l

BEGIN {
    use Time::HiRes 'time';
    $::t0 = time;
    print "BEGIN: $::t0";
}

use strict;
use warnings;

CHECK {
    $::t1 = time;
    print "CHECK: $::t1";
    print 'DIFF:  ', $::t1 - $::t0;
}

INIT {
    $::t2 = time;
    print "INIT:  $::t2";
}

END {
    $::t3 = time;
    print "END:   $::t3";
    print 'DIFF:  ', $::t3 - $::t2;
    print 'Total: ', $::t3 - $::t0;
}

[download]

Obviously, that won't include use Time::HiRes 'time'; in the timings: that might be a good thing. Here's a couple of sample runs: 

BEGIN: 1385861138.48632
CHECK: 1385861138.48653
DIFF:  0.000216007232666016
INIT:  1385861138.48655
END:   1385861138.48658
DIFF:  2.40802764892578e-05
Total: 0.000259876251220703

[download]
BEGIN: 1385861139.78308
CHECK: 1385861139.78329
DIFF:  0.000212907791137695
INIT:  1385861139.78331
END:   1385861139.78333
DIFF:  2.38418579101562e-05
Total: 0.00025486946105957

[download]

BEGIN to CHECK is the compile time; INIT to END is the execution time: see "perlmod: BEGIN, UNITCHECK, CHECK, INIT and END" if you're unfamiliar with these.

Earlier responses have pointed out that "times vary": I'll assume you've understood the issues here. With substantially more compilation/runtime processing (than I've shown here) you may start to see more consistent results.

You haven't indicated what you want to use this for. Averaging results from multiple runs, at different times of the day, or under different loads, would probably be more useful than taking individual snapshots and trying to infer whatever from them.

-- Ken

In reply to Re: How can one best measure compile time of their Perl script? by kcott
in thread How can one best measure compile time of their Perl script? by taint

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