| From: | Curt Sampson <cjs(at)cynic(dot)net> |
|---|---|
| To: | Greg Stark <gsstark(at)mit(dot)edu> |
| Cc: | pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: [PATCHES] ARC Memory Usage analysis |
| Date: | 2004-10-26 06:04:58 |
| Message-ID: | Pine.NEB.4.58.0410261502510.13312@angelic-vtfw.cvpn.cynic.net |
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| Lists: | pgsql-hackers pgsql-patches pgsql-performance |
On Tue, 26 Oct 2004, Greg Stark wrote:
> I see mmap or O_DIRECT being the only viable long-term stable states. My
> natural inclination was the former but after the latest thread on the subject
> I suspect it'll be forever out of reach. That makes O_DIRECT And a Postgres
> managed cache the only real choice. Having both caches is just a waste of
> memory and a waste of cpu cycles.
I don't see why mmap is any more out of reach than O_DIRECT; it's not
all that much harder to implement, and mmap (and madvise!) is more
widely available.
But if using two caches is only costing us 1% in performance, there's
not really much point....
cjs
--
Curt Sampson <cjs(at)cynic(dot)net> +81 90 7737 2974 http://www.NetBSD.org
Make up enjoying your city life...produced by BIC CAMERA
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