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Date: Wed, 9 Dec 2015 17:19:35 +0100
Message-ID: <CAEPJdunR889u4RwUq+M2CtNCHJM2kT09k=mMUe9h-tvdVr4qbQ@mail.gmail.com>
To: Jefferson Gonzalez <jgmdev@gmail.com>
Cc: Lester Caine <lester@lsces.co.uk>, PHP Internals <internals@lists.php.net>
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Subject: Re: [PHP-DEV] Practical comparisons on PHP7
From: kontakt@beberlei.de (Benjamin Eberlei)

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On Wed, Dec 9, 2015 at 4:48 AM, Jefferson Gonzalez <jgmdev@gmail.com> wrote:

> On 12/08/2015 08:32 AM, Lester Caine wrote:
>
>> On 08/12/15 02:23, Rasmus Lerdorf wrote:
>>
>>> Ah, I just checked. You have no opcache at all in your PHP 7 setup. And
>>> you have eaccelerator configured for PHP 5. So an opcode cached PHP 5 is
>>> only 10% faster than a completely unaccelerated PHP 7. That's pretty damn
>>> impressive!
>>>
>>
>> Gallery page with heavier load
>>                       Execute  Memory   Queries  Database
>> PHP5.4
>> eaccelerator off ...   0.60s  10.14Mb   153      0.39s
>> eaccelerator on  ...   0.49s  3.57Mb    153      0.39s
>> PHP5.6
>> TODO
>> PHP7
>> opcache off      ...   0.50s  7.00Mb    153      0.30s
>> opcache on       ...   0.40s  2.00Mb    153      0.30s
>>
>> I'm still taking the 'twice as fast' claim with a pinch of salt, and I'm
>> only seeing opcache is performing as well as eaccelorator, so the idea
>> that PHP7 is an 'essential upgrade to improve performance' may have
>> relevance with some applications, but for the average user simply
>> upgrading the computer may have a better result?
>>
>> I'm still interested in the idea of improving async operations such as
>> not having to wait for all database results until essential, and I'm a
>> little curious why the database service time is so much shorter between
>> 5 and 7 THAT is the major gain between versions. But I need to check if
>> 'Execute' was the total or excludes the database element. I had thought
>> it was the total as the 'Server Stats' also includes the percentage of
>> time handing database queries. Since exactly the same database service
>> is providing both they should be identical so something else is
>> affecting that figure.
>>
>> Bottom line is that given the real world loading on my sites, the
>> differences are probably in the noise of network transit times so not
>> impressive at all :(
>>
>>
> Well I did my own benchmark with my custom made CMS on AMD bulldozer:
>
>     PHP 5.6 with opcache takes as a median 60ms to render a page.
>
>     PHP 7.0 without opcache takes as a median 30ms to render a page.
>
>     PHP 7.0 with opcache takes 5ms as a median to render a page.
>
> So as somebody already said, maybe your code or setup is really busted.
> PHP 7.0 without opcache can be as twice as fast than PHP 5.6 with opcache,
> while PHP 7.0 with opcache maps the floor with PHP 5.6.


please take a look at the 90%, 95% and 99% percentiles as well. Medians and
Averages are really bad for perf comparisons, especially in isolation.


>
>
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