Server Fault is a question and answer site for system and network administrators. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

Im trying to cache the opcode in hard disk.

But Im not sure what the meaning of "shared memory"

disk_only cache data on disk
(I know this means cache data on hard disk)

shm_only cache data in shared memory
(I still confuse about this. Is "shared memory" means swap, or RAM?)

Thanks in advance.

share|improve this question
belongs on – Chopper3 Feb 13 '10 at 10:34
Mwebe - the PHP folks on Stackoverflow will jump at the opportunity to clarify this. @Chopper3 It's quite refreshing to be pushing a question over to SO for a change. :) – Helvick Feb 13 '10 at 12:52
ISN'T it! it never works out like does it! – Chopper3 Feb 13 '10 at 18:56

Shared memory is memory area, which multiple processes can access. It`s is just RAM, only specific thing - OS allows multiple proccesses to access it .

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.