| 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: | Curt Sampson <cjs(at)cynic(dot)net>, Jan Wieck <JanWieck(at)Yahoo(dot)com>, GB Clark <postgres(at)vsservices(dot)com>, Martijn van Oosterhout <kleptog(at)svana(dot)org>, glenebob(at)nwlink(dot)com, pgsql-general(at)postgresql(dot)org |
| Subject: | Re: Linux max on shared buffers? |
| Date: | 2002-07-26 00:50:00 |
| Message-ID: | 200207260050.g6Q0o1k01344@candle.pha.pa.us |
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| Lists: | pgsql-general |
Tom Lane wrote:
> Curt Sampson <cjs(at)cynic(dot)net> writes:
> > But this would only cost us more syscalls, which are relatively
> > inexpensive (compared to things like memory copies) anyway.
>
> Run that by me again?
>
> I'd take memcpy over a kernel call any day. If you want to assert
> that the latter is cheaper, you'd better supply some evidence.
I assume he meant memory copies from kernel to process address space.
--
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