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Re: Windows binaries 64bit for PHP [message #178069 is a reply to message #178067] Fri, 11 May 2012 22:11 Go to previous messageGo to previous message
Jerry Stuckle is currently offline  Jerry Stuckle
Messages: 2598
Registered: September 2010
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Senior Member
On 5/11/2012 3:53 PM, Michael Fesser wrote:
> .oO(Jerry Stuckle)
>
>> On 5/11/2012 3:11 PM, Michael Fesser wrote:
>>>
>>> A little maybe, but I don't think it really matters. What much has the
>>> server to do after it didn't find the requested resource? Deliver
>>> another page or call a script. I can't think of much more, except maybe
>>> a second log entry. The typical redirects from http://example.com/foo to
>>> http://example.com/foo/, which are still seen on many sites, are much
>>> more expensive.
>>
>> No, you don't get it. A 404 causes even more overhead - Apache has to
>> detect the 404
>
> Happens all the time for every single resource.
>

Nope. A static page is served up immediately. No 404 processing
required. Even a PHP page is served up with less overhead than a PHP
page with 404 processing.

404 is not cheap, and can be quite expensive (relatively) if there are a
number of optional modules loaded.

>> , determine which is the correct error page to load
>
> Which is defined in the server configuration.
>

And has to be found in the configuration - not required when the
resource is found.

>> and
>> load it.
>
> Happens all the time for every single resource.
>

Two loads - one failed attempt for the missing resource and a second
successful attempt once it figures out which page has to be loaded.


>> In this case it's a PHP file, so the PHP module has to be
>> loaded and the environment initialized, etc.
>
> On a site using PHP the module is already there and ready to work.
>

Maybe, maybe not. It depends on the server. But even if it is loaded,
it still has to be attached to the thread or process, the environment
initialized.

>> Then the PHP code needs to determine if it is even a request for an
>> image, and if the image can be found and resized. If so, the code must
>> resize the image and send it.
>
> That's the only additional work, once per image. So what?
>

Completely unnecessary work, but ok if your site only has 200 hits per day.

>> Then the module cleanup has to be performed.
>
> Nope, the module stays there. There's just the usual cleanup as for
> every other PHP page.
>

The module must still perform cleanup after the script terminates.

>> Plus, depending on what the sysadmin has installed for Apache
>> extensions, other modules may be called in the process.
>
> Possible, but rather unlikely and irrelevant.
>

Not at all unlikely nor irrelevant.

>> That's a lot of overhead, especially when you know the images and the
>> sizes you need ahead of time.
>>
>> It's fine if you're running 200 hits/day, but not in a busy server.
>
> After a short period of time all most requested images are there.
> Creating another missing image every now and then won't bring a server
> to its knees.
>
> Micha
>

Creating them once with a script means the images are there from the start.

--
==================
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
jstucklex(at)attglobal(dot)net
==================

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