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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.

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belongs on stackoverflow.com – 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 .

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