| From: | Andreas Zeugswetter <andreas(dot)zeugswetter(at)telecom(dot)at> |
|---|---|
| To: | "'hackers(at)postgresql(dot)org'" <hackers(at)postgresql(dot)org> |
| Subject: | Re: [HACKERS] mmap and MAP_ANON |
| Date: | 1998-05-14 09:46:46 |
| Message-ID: | 01BD7F2E.0462AA00@zeugswettera.user.lan.at |
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| Lists: | pgsql-hackers |
> The problem with using a real file is that the filesystem is going to be
> flushing those dirty pages to disk, and that could really hurt
> performance.
definitely
> Actually, when I install Informix, I always have to modify the kernel to
> allow a larger amount of SYSV shared memory. Maybe we just need to give
> people per-OS instructions on how to do that. Under BSD/OS, I now have
> 32MB of shared memory, or 3900 8k shared buffers.
This I think would be the best solution. There are actually not that many systems
with too low limits.
AIX: per segment 256Mb max 10 segments per process (AIX 4.3 any number of segments)
Andreas
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