| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | Gavin Flower <GavinFlower(at)archidevsys(dot)co(dot)nz>, Andres Freund <andres(at)anarazel(dot)de>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: max_parallel_degree > 0 for 9.6 beta |
| Date: | 2016-04-21 23:20:10 |
| Message-ID: | 27991.1461280810@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Robert Haas <robertmhaas(at)gmail(dot)com> writes:
> On Thu, Apr 21, 2016 at 4:01 PM, Gavin Flower
> <GavinFlower(at)archidevsys(dot)co(dot)nz> wrote:
>> Why not 4? As most processors now have at least 4 physical cores, & surely
>> it be more likely to flush out race conditions.
> Because if we did that, then it's extremely likely that people would
> end up writing queries that are faster only if workers are present,
> and then not get any workers.
Is that because max_worker_processes is only 8 by default? Maybe we
need to raise that, at least for beta purposes?
regards, tom lane
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