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To: PHP internals <internals@lists.php.net>
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Date: Tue, 2 May 2017 21:51:08 +0200
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Subject: Re: [PHP-DEV] the experimental jit-branch is impressive
From: lists@rhsoft.net ("lists@rhsoft.net")



Am 02.05.2017 um 21:12 schrieb Nikita Popov:
> On Tue, May 2, 2017 at 9:04 PM, lists@rhsoft.net 
> 
>> You have xdebug enabled...
> 
>     loaded, but not enabled
> 
>     xdebug.default_enable = 0
>     xdebug.profiler_enable = 0
>     xdebug.profiler_enable_trigger = 1
> 
>     7.1.5:             Requests per second: 136.46
>     7.1.5 opcache:     Requests per second: 316.77
>     7.2.0 JIT PGO:     Requests per second: 925.96
>     7.2.0 JIT NON-PGO: Requests per second: 849.99
> 
>     around 8% are the difference with or without PGO, no idea how much
>     strict-types and a 100% typehinted codebase makes a difference to
>     the JIT operations
> 
> This is a common misconception. If you have loaded xdebug you will incur 
> a major performance hit, regardless of ini settings. 
> xdebug.default_enable is a badly named option, which controls display of 
> stack traces, not whether xdebug is enabled. As far as I know, there is 
> no way to disable xdebug once it has been loaded.
> 
> Please unload xdebug and try again

argh - when the trigger is set to generate profiling files runtime is 
doubled compared with xdebug just loaded but indeed xdebug has a massive 
impact

7.1.5 PGO:     Requests per second: 886.63
7.2.0 JIT PGO: Requests per second: 925.96

OK, than it are "only" 5% on a highly optimized codebase

interesting is the impact of PGO-profiling which has likely a 
code-coverage nearly to 95% and that without xdebug our cms-system seems 
to be that efficient that it nearly runs as fast on a quad-core i7 from 
2011 than on a 12-core Xeon from 2015.....