How to improve PHP performance more?

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+2 Q:

How to improve PHP performance more?

I've created PHP application for Facebook. It uses MySQL, Memcached and works on Lighttpd on Centos 2,6 Ghz and 2 GB RAM.

it's basically one PHP file that after first run is cached and every next time it's served in 0,8 ms directly from Memcached.

What more can I do to shorten this time?

+10 A:

Once you get to 0.8 ms, I'm not sure you can go any lower.

However, you can set up multiple servers to handle many concurrent requests (with a common memcached). You will then be able to scale very high by simply adding a new server when you reach limits.

Julien Tartarin 2009-09-30 09:27:03

Agreed. You can only do so much from the software side before you have to start looking at hardware.

ryeguy 2009-09-30 14:05:11

+3 A:

Run XDebug and run the profiler. There you can see if you have any functions that take an abnormal length of time.

I recommend using a program that reads those logs. Like kcachegrind etc.

BTW, when you enter profiler country, there's no turning back.

Ólafur Waage 2009-09-30 09:30:16

Hello, My Code is basically only getting HTML from Memcached and displaying it to user.

tomaszs 2009-09-30 09:50:06

Then you should note that, since you tag it as PHP and talk about a PHP application

Ólafur Waage 2009-09-30 10:52:38

@Olafur Sorry if I was not precise in my question. But as you written I asked my code again for sure. So thanks - it could be a solution.

tomaszs 2009-09-30 11:45:27

Even if the page is simple, you might learn something from the profiler. There are many dark corners, where you can do micro-optimisations.

troelskn 2009-09-30 13:59:40

+2 A:

You can put a http-proxy and load balance to multiple servers. Most http-proxies can double as a cache, which can take load off the application.

Also, make sure that you send the proper http headers, so that your pages are client-side cacheable. This may reduce the number of requests, as the clients will reuse their cached version.

troelskn 2009-09-30 14:01:34

Http header ! check that !

Antoine Claval 2009-09-30 14:27:09

Do you have a php script which gets data from memcached and displays them, or the web server itself gets data, directly from memcached?

I don't know if lighthttpd can display page directly from memcached, but i know nginx can do this google for ngx_http_memcached_module

poiuyttr 2009-09-30 14:22:11

ansaurus

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