| From: | Mark Kirkwood <markir(at)paradise(dot)net(dot)nz> |
|---|---|
| To: | Luke Lonergan <llonergan(at)greenplum(dot)com> |
| Cc: | Dave Cramer <pg(at)fastcrypt(dot)com>, Greg Stark <gsstark(at)mit(dot)edu>, Joshua Marsh <icub3d(at)gmail(dot)com>, pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: Hardware/OS recommendations for large databases ( |
| Date: | 2005-11-19 02:27:49 |
| Message-ID: | 437E8DA5.1050703@paradise.net.nz |
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| Thread: | |
| Lists: | pgsql-performance |
Luke Lonergan wrote:
> Mark,
>
> On 11/18/05 3:46 PM, "Mark Kirkwood" <markir(at)paradise(dot)net(dot)nz> wrote:
>
> If you alter this to involve more complex joins (e.g 4. way star) and
> (maybe add a small number of concurrent executors too) - is it still the
> case?
>
>
> I may not have listened to you - are you asking about whether the
> readahead works for these cases?
>
> I’ll be running some massive TPC-H benchmarks on these machines soon –
> we’ll see then.
That too, meaning the business of 1 executor random reading a given
relation file whilst another is sequentially scanning (some other) part
of it....
Cheers
Mark
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