Selecting a PHP Handler for Apache

PHP handlers are a link between a webserver(say Apache) and the PHP libraries. PHP handlers enable a webserver to load the PHP library in a certain manner and execute the PHP code and return the output to the webserver.

There are many different kind of PHP handler setups available. Each has its own advantages and disadvantages.

Mod_php (DSO)

modphp or the Apache 2 Handler is a apache module for running PHP scripts. modphp runs PHP in a persistent manner like fastcgi. modphp runs all PHP as the Apache user or “nobody”. It keeps worker processes running instead of starting and stopping PHP. There are file permission issues since files belong to the user nobody.

Opcode cache engines like APC and eAccelerator will work with mod_php since it keeps persistent workers alive.
mod_php is faster than CGI , fastCGI , and mod_suphp.

CGI

CGI runs PHP scripts as CGI module , instead of Apache module. CGI by default will run the scripts as the Apache/nobody user. However if suexec is installed then the scripts will be run as the user of the website/account. CGI is slow compared to modphp, because for every request “PHP” is started and stopped.

Opcode caching solutions will not work with CGI.

Suphp

Suphp is an apache module (mod_suphp) and it also runs php scripts as CGI. suphp does not need configuration for each virtual host. It simply runs a php script with the user permissions of the owner. suphp is much slower than mod_php (upto 25 times) and even CGI. However it might be faster than suexec. suphp is easy to setup and is secure in the sense that it keeps track of which user executed the script. Since it requires little configuration it is quite popular with cPanel hostings.

Since suphp starts a PHP process upon each request, it cannot work with any opcode caching solution like APC or eAccelerator. Also suphp does not support FastCGI. It uses no resources when no pages are being requested. Ideal for low traffic websites.

FastCGI

Documentation : http://www.fastcgi.com/mod_fastcgi/docs/mod_fastcgi.html

mod_fastcgi is an Apache module that uses FastCGI to run the PHP scripts. FasCGI is faster than CGI and nearly as fast as modphp. It save CPU usage but uses more memory since it keeps PHP processes alive in background to process requests, instead of starting new processes.

Opcode cache engines like APC and eAccelerator can be used with fastcgi since it keeps persistent processes.

Suexec

Suexec is an Apache module (mod_suexec) that allows CGI scripts to run as a particular user. Suexec needs the user to be configured for each virtual host. suexec is slower than mod_php and mod_suphp. suexec can be used with mod_fastcgi.

Conclusion :

Modphp is ideal for moderate traffic websites, whereas suphp can be used on low traffic websites.
For high traffic websites FastCgi should be considered as it can handle multiple requests better than the rest.
suphp and fastcgi are more secure compared to modphp and plain cgi.

Using the fastest DNS servers

The speed of your internet browsing depends on the dns servers to a certain extent. Whenever a url is opened in the browser, the browser has to first perform a dns request to get the ip address of that particular url’s domain name. For example www.google.com. It is only after the ip address is found, can the browser proceed further with loading the web page by sending http requests.

So the speed factor depends on how fast the dns server responds with the ip details. Now it is understood that the browser/system already knows the ip address of the dns servers (otherwise how would it contant them). The most commonly used dns servers are :

1. Opendns – 208.67.222.222
2. Google dns – 8.8.8.8
3. Your isp’s dns servers

The main factor on which the speed of the dns server depends is, that how far is it from your computer in terms of network hops. If you are somewhere in India, then a server in Singapore will be nearer than a server in the US. This distance can be found out by doing a traceroute to the target system. More the hops, farther away it is.

To measure the speed of the dns server, all that needs to be done is to find out its response time. This can be done very easily using the ping command in the terminal/console. So lets ping each of the dns servers listed above one by one and see their ping response times.

208.67.222.222

$ ping 208.67.222.222
PING 208.67.222.222 (208.67.222.222) 56(84) bytes of data.
64 bytes from 208.67.222.222: icmp_req=1 ttl=52 time=362 ms
64 bytes from 208.67.222.222: icmp_req=3 ttl=52 time=362 ms
64 bytes from 208.67.222.222: icmp_req=4 ttl=52 time=362 ms
64 bytes from 208.67.222.222: icmp_req=5 ttl=52 time=362 ms

So the opendns server has a ping response time of 362ms. Ok, lets try the next one.

Google Dns server

$ ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_req=1 ttl=57 time=128 ms
64 bytes from 8.8.8.8: icmp_req=2 ttl=57 time=132 ms
64 bytes from 8.8.8.8: icmp_req=3 ttl=57 time=127 ms
64 bytes from 8.8.8.8: icmp_req=4 ttl=57 time=129 ms
64 bytes from 8.8.8.8: icmp_req=5 ttl=57 time=131 ms

Google dns server have a ping response time of around 130ms average. Now that is nearly 3 times faster than the open dns server. Many articles out there talk about using opendns for improving dns speed, but first the speed has to be tested, since opendns may not always be the fastest one.

My isp dns – 218.248.255.163

$ ping 218.248.255.163
PING 218.248.255.163 (218.248.255.163) 56(84) bytes of data.
64 bytes from 218.248.255.163: icmp_req=1 ttl=251 time=6.30 ms
64 bytes from 218.248.255.163: icmp_req=2 ttl=251 time=6.16 ms
64 bytes from 218.248.255.163: icmp_req=3 ttl=251 time=6.01 ms
64 bytes from 218.248.255.163: icmp_req=4 ttl=251 time=6.45 ms
64 bytes from 218.248.255.163: icmp_req=5 ttl=251 time=6.25 ms

ISP dns server has a ping response time of around 6.5ms. This is the fastest so far and around 20 times faster than even google dns. This is because this dns server is located very near (may be in same city) to my internet connection.

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