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Re: Windows binaries 64bit for PHP [message #178077 is a reply to message #178072] Sat, 12 May 2012 00:44 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 7:00 PM, Michael Fesser wrote:
> .oO(Jerry Stuckle)
>
>> 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.
>
> But the server always has to check if it's there. How else could he
> deliver it?
>
> And if a previous 404 causes an image file to be created - from that
> time on it will also be "served up immediately". The overhead for that
> single image happens exactly one time. That's nothing to worry about.
>

Not a problem when you're doing 200 hits/day.

>>> Which is defined in the server configuration.
>>
>> And has to be found in the configuration - not required when the
>> resource is found.
>
> The configuration is loaded before and the handlers are defined.
> It's just one function call or another (more or less):
>
> if (resourceIsFound()) {
> sendResource();
> } else {
> sendErrorDocument();
> }
>

You really think that's all there is to it? ROFLMAO!

What does resourceIsFound() do? What does sendErrorDocument() do? A
lot more than just a simple C function call!

>>>> 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.
>
> Like on every other PHP page.
>

Yes, and if the resource is found, no PHP page is required.

>>>> 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.
>
> The work has to be done either way.
>

Not at all. It can be done once offline, instead of on the web server.
And doing a bunch of images offline is far more efficient than trying
to handle a 404.


> If you have 100.000 images and get 100.000 hits a day, each one for a
> different image, all the images are created on that single day and can
> be served directly from that time on. Only the first requester of a
> particular image might notice a little delay.
>

You've obviously never had a site which had 100,000 hits a day. I
suspect your sites never exceed 200 hits/day.

>>>> 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.
>>
>> Creating them once with a script means the images are there from the start.
>
> Which also takes a lot of time and creates images which might not be
> used at all.
>

Less time than creating them on the fly. Plus it's done offline and not
taking web server time.

> In short: These are two totally different approaches, but both have
> their uses and are reasonable. Doing it the "all-before-way" is OK, but
> so is the "on-demand-way". There's absolutely nothing wrong about the
> latter: The server load is almost the same, just spread across time.
>
> Micha
>

In short, you have no idea how to optimize even a slightly busy site.
Your approach works fine for your sites which never have more than 200
hits/day. It does not scale to an even moderately busy site.

I'm not in favor of premature optimization. However, I AM in favor of
not putting an unnecessary load on the web server. But then the sites I
deal with are moderately busy, also.


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

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