Re: Scaling PostgreSQL at multicore Power8

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
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