Posted by Rasmus Lerdorf on 01/06/05 20:58

Adrian Madrid wrote:
> I think I understand where you're coming from. I've had a similar
> problem and the best solution I've found is eAccelerator (previously
> known as Turck MMCache). What EA does is keep the bytecodes PHP compiles
> inshared memory so next time you need that script PHP doesn't need to
> recompile, EA returns the bytecode from SHM. Now, since PHP scripts are
> compiled and saved in SHM all I need to do is /save/ the data that does
> not change often but requires a lot of queries as code (an array inside
> a script) and include it whenever I need the data. No recompiling, no
> need to touch the DB again, pure speed. I hope all this helps you. I
> personally don't need extra processes and stuff like that but if you
> really want all that you can take a look at phpbeans.

What you are talking about is opcode caching. While it certainly speeds
things up, it can be done much faster. When you cache a file that
contains a large PHP array definition, all you are caching are the
instructions to create that array. On every request these instructions
need to be loaded from shared memory and executed in order to recreate
the array. This can be quite slow. What we are discussing here are
ways to avoid recreating the array on every request which is quite
different.

-Rasmus

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