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Date: Mon, 15 Jun 2015 12:06:43 +0300
Message-ID: <CA+9eiLv1NMqW9OcVe1Mwkqxbrj1yqk85Mt7tjuKsfUCguFPp4g@mail.gmail.com>
To: Yasuo Ohgaki <yohgaki@ohgaki.net>
Cc: Levi Morrison <levim@php.net>, "internals@lists.php.net" <internals@lists.php.net>
Content-Type: multipart/alternative; boundary=089e01184d7ad56a7d05188ac62d
Subject: Re: [PHP-DEV] Packed array is not fast?
From: dmitry@zend.com (Dmitry Stogov)

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I see only the test for "packed" array. You may create similar "hash"
array, initializing it in reverse order.

In my experiments "packed" arrays are slightly (8%) faster.

$ sapi/cli/php packed.php
Time: 0.022471189498901
Time: 0.012310028076172

$ sapi/cli/php hash.php
Time: 0.024425029754639
Time: 0.012874126434326

Thanks. Dmitry.


On Mon, Jun 15, 2015 at 6:51 AM, Yasuo Ohgaki <yohgaki@ohgaki.net> wrote:

> Hi Levi,
>
> On Mon, Jun 15, 2015 at 12:35 PM, Levi Morrison <levim@php.net> wrote:
>
> > How are you testing hash vs packed? As far as what you posted I cannot
> > tell a difference =E2=80=93 it looks like you are running the same thin=
g twice
> > (same binary and same input file).
> >
>
> I've modified START index and verified both packed and unpacked array is
> used
> by using gdb. I didn't analyze whole execution, but only zend_hash.c
>
> I didn't paste slightly different code because it will not give us much
> difference
> and it's useless services like 3v4l.
>
> I'm a little disappointed by the result because I was expecting much bett=
er
> result with packed array..
>
> Regards,
>
> --
> Yasuo Ohgaki
> yohgaki@ohgaki.net
>

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