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Re: Zend Loader performance
by Matthew Weier O'Phinney-3
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-- Philip G <gp@...> wrote
(on Sunday, 11 May 2008, 09:36 AM -0500):
> There's arguments on both sides of the fence on this one. I personally like
> having organization in my code, which is why I like the multi-file method and
> we can just use APC to speed up code execution. However, not everybody has that
> option, which runs into a problem. On top of that, you start relying on your
> cache, not your code efficiency, for speedy code which, imo, is very, very bad.
>
> Now, as far as Zend_Loader, don't use it. It completely negates the ability to
> use APC. Zend_Loader allows dynamic loading of classes which just happens to
> prevent APC's ability to determine which files should be cached. Always use
> require/include for your classes, that way you can use APC and its features.
> Zend_Loader is convenient, but it's not worth the overhead it gives. The only
> situations I use Zend_Loader is during factor class creations. That's it.
Philip, this is simply not true in PHP >= 5.2.0. PHP 5.2.0 added a
realpath cache, and Zend_Loader performs very well under both APC and
Zend Platform on those versions -- typically within a few percentage
points of a straight require_once. We will be releasing figures in the
coming months showing real-world benchmarks of this.
The typical source regarding APC and optional requires is a post by
Rasmus that is *SEVERAL* years old and predates the realpath cache. If
you have any up-to-date information that proves me wrong, please post
it, including methodology.
Finally, despite any performance considerations of Zend_Loader and/or
require_once, the fact of the matter is that loading the files for your
application is going to be a small fraction of any site that utilizes
databases or web services. The only reason I can see for optimizing this
by using a compile-to-a-single-file type of solution is when you're
getting so many hits that doing so is going to save you money in terms
of no longer needing additional _servers_ to handle load.
> I like the compile() method you pointed out, Lukasz, but I'm not quite
> completely sold on it yet. I can see the benefits, but there are
> questions to ask on both sides of that, too
>
> Philip
>
>
> On Sun, May 11, 2008 at 8:36 AM, Karol Grecki <kgrecki@...> wrote:
>
>
> Did you test it with opcode cache enabled?
>
> It's true that lots of files are included and compiled, but that's what you
> have APC for.
>
> Karol
>
>
> ukasz Bandzarewicz wrote:
> >
> > Hi all!
> >
> > During simple profiling I noticed that Zend_Loader could consume 20-25%
> of
> > execution time.
> > It's quite obvious, because ZF has to load lots of files, but..
> > have you ever wondering about compile ZF code? Something similar to
> > phpDoctrine's compile method
> > (http://www.phpdoctrine.org/documentation/manual/0_11?one-page#
> improving-performance)?
> >
> > The compile method makes single file of most used components.
> Additionally
> > it could remove comments and white spaces to reduce size of compiled
> file.
> > It could reduce slow disk operations (check if file exists, load file,
> > etc.) and increase performance.
> >
> > What you think, is this feasible?
> >
> >
>
> --
> View this message in context: http://www.nabble.com/
> Zend-Loader-performance-tp17170525p17170545.html
> Sent from the Zend Framework mailing list archive at Nabble.com.
>
>
>
>
>
> --
> Philip
> gp@...
> http://www.gpcentre.net/
--
Matthew Weier O'Phinney
Software Architect | matthew@...
Zend - The PHP Company | http://www.zend.com/
(on Sunday, 11 May 2008, 09:36 AM -0500):
> There's arguments on both sides of the fence on this one. I personally like
> having organization in my code, which is why I like the multi-file method and
> we can just use APC to speed up code execution. However, not everybody has that
> option, which runs into a problem. On top of that, you start relying on your
> cache, not your code efficiency, for speedy code which, imo, is very, very bad.
>
> Now, as far as Zend_Loader, don't use it. It completely negates the ability to
> use APC. Zend_Loader allows dynamic loading of classes which just happens to
> prevent APC's ability to determine which files should be cached. Always use
> require/include for your classes, that way you can use APC and its features.
> Zend_Loader is convenient, but it's not worth the overhead it gives. The only
> situations I use Zend_Loader is during factor class creations. That's it.
Philip, this is simply not true in PHP >= 5.2.0. PHP 5.2.0 added a
realpath cache, and Zend_Loader performs very well under both APC and
Zend Platform on those versions -- typically within a few percentage
points of a straight require_once. We will be releasing figures in the
coming months showing real-world benchmarks of this.
The typical source regarding APC and optional requires is a post by
Rasmus that is *SEVERAL* years old and predates the realpath cache. If
you have any up-to-date information that proves me wrong, please post
it, including methodology.
Finally, despite any performance considerations of Zend_Loader and/or
require_once, the fact of the matter is that loading the files for your
application is going to be a small fraction of any site that utilizes
databases or web services. The only reason I can see for optimizing this
by using a compile-to-a-single-file type of solution is when you're
getting so many hits that doing so is going to save you money in terms
of no longer needing additional _servers_ to handle load.
> I like the compile() method you pointed out, Lukasz, but I'm not quite
> completely sold on it yet. I can see the benefits, but there are
> questions to ask on both sides of that, too
>
> Philip
>
>
> On Sun, May 11, 2008 at 8:36 AM, Karol Grecki <kgrecki@...> wrote:
>
>
> Did you test it with opcode cache enabled?
>
> It's true that lots of files are included and compiled, but that's what you
> have APC for.
>
> Karol
>
>
> ukasz Bandzarewicz wrote:
> >
> > Hi all!
> >
> > During simple profiling I noticed that Zend_Loader could consume 20-25%
> of
> > execution time.
> > It's quite obvious, because ZF has to load lots of files, but..
> > have you ever wondering about compile ZF code? Something similar to
> > phpDoctrine's compile method
> > (http://www.phpdoctrine.org/documentation/manual/0_11?one-page#
> improving-performance)?
> >
> > The compile method makes single file of most used components.
> Additionally
> > it could remove comments and white spaces to reduce size of compiled
> file.
> > It could reduce slow disk operations (check if file exists, load file,
> > etc.) and increase performance.
> >
> > What you think, is this feasible?
> >
> >
>
> --
> View this message in context: http://www.nabble.com/
> Zend-Loader-performance-tp17170525p17170545.html
> Sent from the Zend Framework mailing list archive at Nabble.com.
>
>
>
>
>
> --
> Philip
> gp@...
> http://www.gpcentre.net/
--
Matthew Weier O'Phinney
Software Architect | matthew@...
Zend - The PHP Company | http://www.zend.com/
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