Re: [HACKERS] Re: [QUESTIONS] How to use memory instead of hd?

Bruce Momjian <maillist@candle.pha.pa.us>

From: Bruce Momjian <maillist@candle.pha.pa.us>
To: kgor@inetspace.com (Kent S. Gordon)
Cc: vadim@sable.krasnoyarsk.su, terry@terrym.com, hackers@postgreSQL.org
Date: 1998-04-22T17:18:23Z
Lists: pgsql-hackers
>     > Yes, we could.  I don't think we do because we an anon-mapped
>     > region is the same as shmem, but if the limit is higher for anon
>     > mmap, we could used it.
> On FreeBSD the limit for mmap is basically the amount of swap vs a
> predefined limit when a kernel is built.  This was a project I was
> thinking of doing but have not had the time yet.  mmap may also be
> faster due to tighter intergration in the kernel.  In general it is
> better to avoid all the SYSV IPC calls and use other methods of doing
> the needed operations.  Stevens book (either Advanced Unix Programming 
> or Unix Network Programming) has a good discussion of the pro/CONS of
> the SYSV IPC interfaces.

OK, mmap added to FAQ. 


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