I found these instuctions;

http://nicolebluto.com/node/20

I installed php-apc;

aptitude install php-apc

Then I added these lines to php.ini;

 extension=apc.so
 apc.enabled=1
 apc.shm_size="64

apache 2 restart;

/etc/init.d/apache2 restart

However, after this was done, I was left with a blank page at my web address.
I had to remove php-apc and restart apache2 to restore my web site.
This was done very early morning so I probably have missed out a very simple step.
Any advice would be much appreciated.

there's a /etc/php5/conf.d/apc.ini used for configuring apc

also, there seems to be a quote mark that doesn't need to be there in apc.shm_size="64 no idea if that's causing the problem.

one last thing, there's /usr/share/doc/php-apc/apc.php.gz which you can copy to a virtual host and uncompress which gives you pretty graphs.

On Ubuntu:

/etc/php5/conf.d/apc.ini

apc.shm_size=30

No quotes around values. You can install apc.php and check how much your site consumes. 30 might be enough.

Edit: What the above said

@crimp-thanks for the input.
Can I safely assume the same code usage for Debian?

@chesty-thanks for the input.
I will give this a try later in the day and post my results.

Sorry guys-followed these instructions and still getting plain white pages served.
I removed php-apc again and re-started apache 2 and website is back to normal.

Note: I have cleared browser cache and I do not have wp-cache installed.

Any ideas?

Did you delete the

extension=apc.so

line in /etc/php5/apache2/php.ini ? You're not suppposed to add extension entries manually if you use aptitude to install them.

Check your Apache error log for any hints. Also, if you have the php5-cli package installed, you can type

php -a

in the command line and check for PHP startup errors.

@hybinet-thanks for the input.
Yes, apc.co was removed from php.ini.
I will look further into this in coming days, apache error log and php-cli.
Busy constructing the site at the moment

I installed APC on Friday just gone. Am well impressed with the obvious drop in CPU usage...

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