Talk:Daemon redesign

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[edit] Forking overhead

Quick tests on my Linux server; loading up common.php & a whole bunch of classes from lib/ to maximize the pain. Work payload is a loop that runs in 1-2ms.

Ubuntu 8.04, PHP 5.2.6, APC installed and cli testing mode enabled. Overhead measured as runtime difference against baseline, divided by count of items run to get a per-item launch overhead.

  • Baseline: running 1000x within one process after loading all classes
  • Initialize, then pcntl_fork() 1000x: 28ms/item
  • pcntl_fork() 1000x with initialization in child (APC on): 37ms/item
  • http->mod_php+APC (over localhost): 111ms/item
  • pcntl_fork() 1000x with initialization in child (APC off): 137ms/item
  • Shell out individually 1000x: 150ms/item overhead (APC off; cache doesn't survive to next process)
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