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In-Reply-To: <CA+9eiLuOcd-u_kzu+MZM71Ns_-9vsSbifFF5x9Q1b4k0NV12Wg@mail.gmail.com>
Date: Wed, 22 Oct 2014 21:12:13 +0100
Cc: PHP Internals <internals@lists.php.net>
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Message-ID: <F41D165E-A2FB-4423-BF8F-6F6B5F4E201E@ajf.me>
References: <8C47FA53-0964-49C0-963C-332A936348A5@ajf.me> <CA+9eiLuOcd-u_kzu+MZM71Ns_-9vsSbifFF5x9Q1b4k0NV12Wg@mail.gmail.com>
To: Dmitry Stogov <dmitry@zend.com>
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Subject: Re: [PHP-DEV] [RFC] Big Integer Support
From: ajf@ajf.me (Andrea Faulds)


> On 21 Oct 2014, at 09:35, Dmitry Stogov <dmitry@zend.com> wrote:
>=20
> I expect, it'll make some slowdown for all PHP scripts, independently, =
if they use BIGINT or not.
> I'll try to take a deeper look into the patch later...
>=20
> Could you provide some benchmark results, comparing your patch with =
master?

I finally made the requested benchmarks. There=E2=80=99s barely a =
noticeable difference, though the bigint branch is apparently marginally =
faster (most likely from getting rid of fast_increment_function):

	master	bigint
	0.344788074	0.339091063
	0.34658289	0.361176014
	0.376623154	0.346175194
	0.35006094	0.359763861
	0.352533817	0.341754198
	0.354025841	0.357409
	0.360356092	0.379124165
	0.367921829	0.351316929
	0.370724916	0.373735189
	0.351090908	0.346349001
	0.355952978	0.356275797

average	0.357332858	0.355651855

(Times in seconds, smaller is better.)

Script:

<?php
$start =3D microtime(true);

for ($i =3D 0; $i < 1000000; $i++) {
    $a =3D 2 * 3;
    $b =3D $a - 3;
    $c =3D $a * $b;
    $d =3D $c / $c;
}

$end =3D microtime(true);

echo "took ", $end - $start, " secs\n=E2=80=9D;
?>

I ran the script several times, then took the results and put them into =
Excel to produce the above table with its averages.

So common scripts are either unaffected, or will run ever-so-slightly =
faster.
--
Andrea Faulds
http://ajf.me/