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Pecl may not be able to perform the installation

Dueto pecl following an 8 MB restriction that disregards PHP.ini, pecl maybomb out with a Fatal error if you attempt to install apc with it. Youcan solve this by using the command ''pear install pecl/acp'' instead.

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Got this working on Ubuntu 7.04 Feisty

I already had PEAR/PECL installed on a system with Apache2 and PHP5, running under Ubuntu 7.04 Feisty.


$ sudo su
# apt-get update
# apt-get install PHP5-dev
# apt-get install apache2-prefork-dev
# apt-get install apache-dev
# pecl install apc


answer yes when prompted


# echo "extension=apc.so" >> /etc/PHP5/apache2/PHP.ini
# /etc/init.d/apache2 stop
# apt-get remove apache2
# apt-get install apache2
# /etc/init.d/apache2 stop
# /etc/init.d/apache2 start
# exit
$


At least I hope this is working. I wish I knew how to test if the performance actually increased.

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Trouble

Theinstalling with your instructions goes just fine, but APC doesnt wantto start for me. Apache / PHP gives the following error:

PHP Warning: PHP Startup: Unable to load dynamic library''/usr/lib/PHP/modules/apc.so'' - /usr/lib/PHP/modules/apc.so: cannotopen shared object file: Permission denied in UnkNown on line 0

Any help would really be appreciated

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Thanks, Khalid.I asked my

Thanks, Khalid.

I asked my host to do it for me and immediately from then onwards, all my drupal pages are showing an internal 500 server error.

Does APC have a problem with PHP running as suPHP (like suexec)?

Thanks,
Venkat

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Doesn''t work

ActuallyI recall reading specifically that suexec is kNown not to work withAPC. Perhaps this is because it is CGI (new process every time arequest comes in). The only versions that work with APC and otheraccelerators are the mod_PHP (Apache) or Fast CGI.

In your case, suexec is a Trade off (security vs. performance).
--
2bits -- Drupal consulting

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well, it seems to work:-)My

well, it seems to work:-)

My host had simply given incorrect permissions on the temporary APCscript. I don''t kNow the intricacies of it, but they said setup wouldbe slightly different on a cPanel VPS and enabled it.

Venkat

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suphp

Thanks for the email.

Your site is running suPHP (which is still CGI), and suhosin which some say is incompatible with op-code caches (not sure).

Please try with and without APC using devel and see if the pages execute faster with APC on suPHP. I doubt they would.
--
2bits -- Drupal consulting

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suggestion

Nice and simple tutorial.

One question:
Why APC, and not eAccelerator?
In some of your prevIoUs articles (benchmarking APC vs eAccelerator using drupal and PHP op code caches/accelerators: a must for a large site) you wrote that eAccelerator has better performance over APC.

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Stability

eAccelerator is definitely better than APC for speed (faster) and memory utilization (uses less memory).

However, with newer versions of PHP and Drupal, APC Now has the edgein stability. PrevIoUsly, we had maybe one or two seg faults witheAccelerator per week, which was acceptable, and the logwatcher scriptrestarted things automatically.

After upgrading, it was seg faulting every 2 hours. Once we switched to APC, it was stable and rock solid.

There is also xcache, which we experimented with, but not used in production work.

I plan to publish updated benchmarks of APC, eAccelerator and xcache in the near future.
--
2bits -- Drupal consulting

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