PHP accelerator
A PHP accelerator is a PHP extension designed to improve the performance of software applications written in the PHP programming language.
Operation
Most PHP accelerators work by caching the compiled bytecode of PHP scripts[clarification needed] to avoid the overhead of parsing and compiling source code on each request (some or all of which may never even be executed). To further improve performance, the cached code is stored in shared memory and directly executed from there, minimizing the amount of slow disk reads and memory copying at runtime.
Practical benefits
PHP accelerators can substantially increase the speed of PHP applications. Improvements of web page generation throughput by factors of 2 to 7 have been observed[1][2][3].
The effect on application performance of opcode caching varies widely, depending on factors such as the inherent execution time of the PHP application and the percentage of source code actually executed on a given request, and whether additional optimization steps are performed. While a code optimizer may even slow down overall performance when used in isolation, it can provide an additional performance boost when coupled with a bytecode cache, as the optimization effort is performed just once.
See also
References
- ^ "PHP on Windows: The WinCache 1.0 Benchmark". Retrieved 2 September 2010.
- ^ "Benchmarking Drupal with PHP op-code caches: APC, eAccelerator and XCache compared". Retrieved 2 September 2010.
- ^ "Performance of Yii". Retrieved 2 September 2010.
External links
- Alternative PHP Cache, a widely used opcode cache.
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