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Increasing PHP Application Performance with XCache

Fri, 30 May 2008 00:49:00 +1000

Most interpreted programming languages parse source files and translate/compile them into opcode/bytecode that are suitable to be executed in the virtual machine. Python for example, dumps the compiled opcode into the .pyc or .pyo files so when the same file is imported again in the future, no parsing and compilation needs to be done. On the other hand plain vanilla PHP does not really have a way to save cached opcode so that at every request, source files have to be parsed and compiled into opcode again and again.

So we have the PHP accelerators which are mostly opcode cachers + optimiser, which cache the compiled opcode to either memory or disk, so the scripts don’t need to be parsed and compiled again in subsequent requests. They greatly improve the performance, and even the up-coming PHP6 will have the APC built in by default.

Introducing XCache

Personally I am using XCache on most my PHP apps. From its introduction page:

XCache is a open-source opcode cacher, which means that it accelerates the performance of PHP on servers. It optimizes performance by removing the compilation time of PHP scripts by caching the compiled state of PHP scripts into the shm (RAM) and uses the compiled version straight from the RAM. This will increase the rate of page generation time by up to 5 times as it also optimizes many other aspects of php scripts and reduce serverload.

Maybe not 5 times, but there is definite improvement from a standard PHP installation without the opcode cacher. Here is a CPU utilisation graph for my VPS at Linocde — I took XCache off trying to debug a segfault issue, and put it back on a few hours later.

Installing XCache

Installing XCache on most Linux distributions is trivial. Most my production boxes are running Ubuntu now, so I just

$ sudo apt-get install php5-xcache

And restart my web server — it’s done! Or on my Gentoo development box:

$ sudo emerge dev-php5/xcache

The bundled xcache.ini (found in your PHP’s configuration directory) has pretty sane setting. You might wish to adjust xcache.size to reflect your memory size.

But Is It Stable Enough for Production?

An optimisation technique is useless, if it hinders stability. This is actually the reason why am I posting this story — because my PHP/FastCGI servers crash at least once a day that render the Lighttpd front-end returning “500 Internal Error”, which I suspect might be XCache related (although I usually don’t have a chance to debug the processes and verify).

It is not huge load — lighttpd is only serving around 4 requests/second. The crash also seems to be random, i.e. not always at the peak of the traffic, and it happens during weekends as well as weekdays (that site of mine gets around only 70% of traffic during weekends). I actually wrote a simple shell script to monitor the site every minute and if 500 Internal Error is detected, spawn-fcgi is restarted — but I can imagine my users must be very annoyed.

Or maybe there is just nothing wrong with XCache itself but the fault lies on PHP or Lighttpd — I have no idea. Easiest way is just disabling XCache for a few days and see whether my site still crashes. Might do that this weekend.

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It is fascinating how search engines talk to you about your web hosting site and even your own prospects and yet you ignore them and have no interest in what they have to say. This is exactly what any webmaster who has no time for his web stats is usually saying with his actions.

Virtualization with Microsoft (Virtual Server 2005 R2 SP1)

Thu, 08 May 2008 17:48:03 -0400
Talk about server virtualization, you go on talking about Virtuozzo, Xen, VMWare Server etc. This article aims to present another virtualization application offered by Microsoft - Microsoft Virtual Server 2005 R2 SP1.

A couple of attractive features about Microsoft Virtual Server 2005 R2 SP1 are: it is available free of cost and also it supports the usage of Microsoft Windows as well as Linux distributions as guest operating systems.

Share and Enjoy:These icons link to social bookmarking sites where readers can share and discover new web pages.

JaguarPC Partners with Elfbox

Sun, 03 Jun 2007 04:29:32 +0000
News:Offers 50% off JaguarPC’s colocation service to any customer purchasing an Elfbox server, until July 4, 2007.Read full story

Featured host gator sucks Items



If you know anything about hosting or have been looking for a host I am sure
that you have some how or some way landed on the hostgator website. hostgator
has been around since 2002 and they have made their web presence very strong,
for example type in any hosting related keyword and I am sure that you will find
them in a google ad or in the top of the search engines. hostgator offers a lot
of variety to their customers so there is a lot to choose from. hostgator offers
three basic plans for the average consumer and website owner; they also offer a
wide range of reseller packages and dedicated servers for the larger customers.



hostgator offers a fairly basic plan for 4.95$ (When paid 3 years in advance) or
8.95$ if paid month to month, this plan offers 350GB of disk space and 3000GB of
bandwidth but incredibly that only let you host one domain so this package is
virtually worthless. The next plan up which they call the baby offers 600GB of
disk space and 6000GB of monthly bandwidth and costs 9.95$ per month if you pay
month to month. If you pay for 1 year in advance you can get this package at
119.40$. This plan of hostgator is one of the most famous plans in the web
hosting industry. This plan offers unlimited domains to be hosted on your
account and also offers some upgraded features from the very basic plan
including unlimited pop3 email accounts, unlimited ftp accounts, unlimited sub
domains, and unlimited parked domains, it also offer ninety nine point nine
percent server uptime compared to the guaranteed ninety nine point five percent
guaranteed uptime offered with the most basic plan. The next thing that they
offer is the swamp plan which gives you the user 1000GB of disk space and
unlimited monthly bandwidth and offers chili soft asp which the other plans do
not offer, in addition the swamp plan also offers private ssl a feature that
most other hosting companies don't offer and costs 14.95$ per monthif paid
monthly or yearly.



hostgator also offers some dedicated servers for proxies and things of that
nature, they are quite expensive though compared to the competition and this is
a whole different market compared to the basic hosting. One nice feature of the
hostgator service is that they offer Cpanel which is quite a good control panel;
this is free compared to some other hosts which charge for the upgrade to a
Cpanel hosting plan. Also like most other hostgator offers a online chat support
and a toll free number that you can call in case you need assistance in setting
up you�re hosting or trying to pick a plan out that fits your needs. Over all
hostgator would probably be a eight out of ten because they offer a lot of
features but only on their more expensive plans where as most other hosts will
offer the same features on there low end plans, another big turn off is that
they only allow you to host one domain on there cheapest plan, most hosts allow
unlimited or at least fifteen or twenty.

User Reviews

Asim says :

hostgator is an exceptional hosting provider, never got disappointed, using
dedicated server these days and it is awesome!



Aditya Singh says :

I loved hostgator and their support. It rocks all ways. They truly deserve to be
called the web hosting company on the internet.



Amit Nyamtabad says :

hostgator is one of the biggest hosting company & I am hosting couple of my
sites with these guys. They really do provide good customer support & quality
uptime. Till now my experience has been good with the them.

Rating : A++



GVK says :

Yes, my choice is Host Gator, am with Host Gator since once year. I don't say
they are cheap and best. They are Better than Best :)

Customer Support is awesome, till now i got my problems solved in less than 5-10
mins. Rated: 10



Navjot Singh says :

Excellent Hosting I must say. 100% Uptime. I loved the fact that it gives no
discounts for yearly payment, so it never forces us to buy yearly. So we can
test for a month and then switch to other if we don't like it. But never liking
it...nah such a situation will never arise. I am running a vb forum and never
saw loading touching 2+ even on a shared account. That's excellent considering
at my last host it touched 10-14% usually.

Highly recommended.





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