Re: Database cluster? - Mailing list pgsql-general

From Alain Toussaint
Subject Re: Database cluster?
Date
Msg-id Pine.LNX.4.30.0012011807420.299-100000@alain
Whole thread Raw
In response to Re: Database cluster?  ("Gordan Bobic" <gordan@freeuk.com>)
List pgsql-general
> Please forgive my ignorance (I haven't used Postgres for that long), but
> what are shm and sem?

shared memory and semaphores,interresting tidbit on Linux (2.4.0-test
series at least) is that shared memory can be a nodev filesystem (like proc or
devfs):

/dev/ide/host0/bus0/target0/lun0/part2 on / type ext2 (rw,errors=remount-ro,errors=remount-ro)
proc on /proc type proc (rw)
/shm on /shm type shm (rw)

and there's at least a few other nodev filesystem in the latest kernel
series:

nodev    shm
nodev    sockfs
nodev    pipefs
nodev    proc
    ext2
nodev    devfs

i'm doing some heavy research into these filesystem but so far,there's a
BIG lack of docs.

Alain


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