Re: APC & __autoload & webclusters

Nathan Nobbe wrote:

On Thu, Feb 21, 2008 at 12:01 PM, Jochem Maas <jochem@iamjochem.com> wrote:

Richard Lynch schreef:

If it's that inter-tangled, then I would hazard a WILD GUESS that the __autoload will still end up loading everything...

but not on every request ;-) ... I do use output caching, and I know not everything is actually used in every request.

i think youre good to go w/ autoload not loading everything up, but what about existing include / require directives? if the code doesnt already use __autoload() its almost certainly strewn w/ these. so i think if you want the boost from __autoload, not loading up everything, youll at least have to strip these out. I know - but it's a rubbish solution because it offer no control as to what

is cleared from the APC cache, sometimes I want to clear opcodes, sometimes user-data, sometimes both ... graceful means being forced to clear everything.

you can pass a parameter to apc_clear_cache() http://www.php.net/manual/en/function.apc-clear-cache.php that distinguishes what you want to clear; user data or cached opcode. obviously calling it from the cli will not clear the webserver user cache though. One would think that there was something like this indeed - I cannot find

it, but then there must be something ... I assume, for instance, that Yahoo!** occassionally see fit to clear APC caches on more than one machine and I doubt Rasmus sits there and opens a browser to run apc.php on each one ;-)

i dont know how yahoo does it, but i do know a little about how facebook does it; they had 3 speakers at the dc php conference last year. i think you might find these slides helpful, (sorry for the ridiculuus url) http://www.google.com/url?sa=t&ct=res&cd=1&url=http%3A%2F%2Ftekrat.com%2Ftalks_files%2Fphpdc2007%2Fapc%40facebook.pdf&ei=tce9R9T4FqrszATeiZG6CA&usg=AFQjCNF_1Ecm2cL1EINgRQG9k3fTEclzpA&sig2=ifrJK545M2liBdXbRrHrIw you can use capistrano to deploy the new files; but it may be more convenient to use php and http requests to update all the server caches; *just a thought*. there are optimizations that are possible as well, such as setting, apc.stat=0 and using apc_compile_file() rather than clearing the entire cache, but these techniques add complexity. it sounds like you just want to get a decent bumb w/o too much additional complexity, so i wouldnt recommend them here, but i thought id mention them in passing.. -nathan

Nathan, cheers for the link to facebook pdf, just had a read and it's good stuff, also lead me on to this after a short google: http://sizzo.org/wp/wp-content/uploads/2007/09/facebook_performance_caching.pdf *wanders off for a couple of hours on php.net/apc* Nathan: almost march 14th :D