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To: Dmitry Stogov <dmitry@zend.com>
CC: Zeev Suraski <zeev@zend.com>, Andrea Faulds <ajf@ajf.me>, 
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 Sebastian Bergmann <sebastian@php.net>, 
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Subject: Re: [PHP-DEV] phpng: Refactored PHP Engine with Big Performance Improvement
From: rasmus@lerdorf.com (Rasmus Lerdorf)

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On 5/12/14, 12:56 PM, Dmitry Stogov wrote:
> FastCGI (non-PIC)  537 req/sec
> mod_php (non-PIC) 555 req/sec
> mod_pgp (PIC)       463 req/sec
>=20
> with non-PIC code mod_php is a bit faster than FastCGI (as expected).
>=20
> PIC makes a big difference on x86.

I wonder if the difference is as large on x86_64. You tested only on
32-bit x86, right?

Also, even with FastCGI, you are going to be linking in a whole bunch of
PIC shared libraries. So in a realworld app that makes lots of calls
into these libraries you are still going to have jump table function
call overhead.

Another thought. Since PIC overhead is on function calls and our default
VM is CALL, perhaps using SWITCH or GOTO instead might help here? And if
it does it might make sense to change the default now that the world is
64-bit and we can't compile non-PIC anymore.

-Rasmus


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