| From: | Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com> |
|---|---|
| To: | Andres Freund <andres(at)anarazel(dot)de> |
| Cc: | pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Scaling PostgreSQL at multicore Power8 |
| Date: | 2015-08-31 15:54:17 |
| Message-ID: | 55E478A9.30809@2ndquadrant.com |
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| Lists: | pgsql-hackers |
On 08/31/2015 05:48 PM, Andres Freund wrote:
> On 2015-08-31 17:43:08 +0200, Tomas Vondra wrote:
>> Well, I could test the patch on a x86 machine with 4 sockets (64 cores), but
>> I wonder whether it makes sense at this point, as the patch really is not
>> correct (judging by what Andres says).
>
> Additionally it's, for default pgbench, really mostly a bottlneck after
> GetSnapshotData() is fixed. You can make it a problem much earlier if
> you have index nested loops over a lot of rows.
[scratches head] So does this mean it's worth testing the patch on x86
or not, in it's current state? Or should we come up with another test
case, exercising the nested loops?
regards
--
Tomas Vondra http://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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