| From: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Manfred Spraul <manfred(at)colorfullife(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Memory buffer alignment |
| Date: | 2003-09-27 21:45:58 |
| Message-ID: | 200309272145.h8RLjww14477@candle.pha.pa.us |
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| Lists: | pgsql-hackers |
Tom Lane wrote:
> Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> writes:
> > it certainly seems like it would be a good idea to have the 8k buffers
> > aligned on 4k offsets.
>
> Why? What mechanism do you expect would find that more efficient?
There was the idea that some OS's can swap the pages in from kernel into
the user space. I am not sure any one does that, but it would be
interesting to see. Also, a single shared buffer access would be a
single virtual memory lookup, rather than two lookups. Not sure, but it
would interesting to see.
--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 359-1001
+ If your life is a hard drive, | 13 Roberts Road
+ Christ can be your backup. | Newtown Square, Pennsylvania 19073
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