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* tuning postgresql 9.3.5 and multiple cores
@ 2014-08-25 18:47 Jeison Bedoya Delgado <jeisonb@audifarma.com.co>
0 siblings, 2 replies; 4+ messages in thread
From: Jeison Bedoya Delgado @ 2014-08-25 18:47 UTC (permalink / raw)
To: pgsql-performance
hi, recently i change the hardware of my database 32 cores up to 64
cores and 128GB Ram, but the performance is the same. Perhaps i have to
change any parameter in the postgresql.conf?.
Thanks by your help
--
Atentamente,
JEISON BEDOYA DELGADO
.
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^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: tuning postgresql 9.3.5 and multiple cores
@ 2014-08-26 01:51 Jeff Janes <jeff.janes@gmail.com>
parent: Jeison Bedoya Delgado <jeisonb@audifarma.com.co>
1 sibling, 1 reply; 4+ messages in thread
From: Jeff Janes @ 2014-08-26 01:51 UTC (permalink / raw)
To: Jeison Bedoya Delgado <jeisonb@audifarma.com.co>; +Cc: pgsql-performance
On Monday, August 25, 2014, Jeison Bedoya Delgado <jeisonb@audifarma.com.co>
wrote:
> hi, recently i change the hardware of my database 32 cores up to 64 cores
> and 128GB Ram, but the performance is the same. Perhaps i have to change
> any parameter in the postgresql.conf?.
>
PostgreSQL does not (yet) automatically parallelize queries.
Unless you have more than 32 queries trying to run at the same time,
increasing the number of cores from 32 to 64 is unlikely to be useful.
Cheers,
Jeff
^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: tuning postgresql 9.3.5 and multiple cores
@ 2014-08-26 09:50 Soni M <diptatapa@gmail.com>
parent: Jeff Janes <jeff.janes@gmail.com>
0 siblings, 0 replies; 4+ messages in thread
From: Soni M @ 2014-08-26 09:50 UTC (permalink / raw)
To: Jeff Janes <jeff.janes@gmail.com>; +Cc: Jeison Bedoya Delgado <jeisonb@audifarma.com.co>; pgsql-performance
Changing to a higher rate CPU would be more helpful if you run less than 32
queries at a time.
On Tue, Aug 26, 2014 at 8:51 AM, Jeff Janes <jeff.janes@gmail.com> wrote:
> On Monday, August 25, 2014, Jeison Bedoya Delgado <
> jeisonb@audifarma.com.co> wrote:
>
>> hi, recently i change the hardware of my database 32 cores up to 64 cores
>> and 128GB Ram, but the performance is the same. Perhaps i have to change
>> any parameter in the postgresql.conf?.
>>
>
>
> PostgreSQL does not (yet) automatically parallelize queries.
>
> Unless you have more than 32 queries trying to run at the same time,
> increasing the number of cores from 32 to 64 is unlikely to be useful.
>
> Cheers,
>
> Jeff
>
--
Regards,
Soni Maula Harriz
^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: tuning postgresql 9.3.5 and multiple cores
@ 2014-08-26 10:10 Mark Kirkwood <mark.kirkwood@catalyst.net.nz>
parent: Jeison Bedoya Delgado <jeisonb@audifarma.com.co>
1 sibling, 0 replies; 4+ messages in thread
From: Mark Kirkwood @ 2014-08-26 10:10 UTC (permalink / raw)
To: Jeison Bedoya Delgado <jeisonb@audifarma.com.co>; pgsql-performance
On 26/08/14 06:47, Jeison Bedoya Delgado wrote:
> hi, recently i change the hardware of my database 32 cores up to 64
> cores and 128GB Ram, but the performance is the same. Perhaps i have to
> change any parameter in the postgresql.conf?.
>
In addition to the points that others have made, even if you do have >
32 active sessions it it not clear that 64 cores will automagically get
you twice (or in fact any) better performance than 32. We are seeing
exactly this effect with a (60 core) machine that gets pretty much the
same performance as an older generation 32 core one.
Interestingly while this is *likely* a software issue - it is not
immediately obvious where it lies - we tested Postgres (9.3/9.4/9.5) and
Mysql (5.5/5.6/5.7) *all* of which exhibited the the lack of improvement
with more cores.
Profiling suggested numa effects - but trying to eliminate these seemed
to simply throw up new factors to inhibit performance. My *guess* (and
it is a guess) is that we are seeing 2 (perhaps more) performance
bottlenecks very close to each other: numa and spinlock contention at least.
Regards
Mark
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2014-08-25 18:47 tuning postgresql 9.3.5 and multiple cores Jeison Bedoya Delgado <jeisonb@audifarma.com.co>
2014-08-26 01:51 ` Jeff Janes <jeff.janes@gmail.com>
2014-08-26 09:50 ` Soni M <diptatapa@gmail.com>
2014-08-26 10:10 ` Mark Kirkwood <mark.kirkwood@catalyst.net.nz>
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