Re: Reduce ProcArrayLock contention

On Fri, Aug 7, 2015 at 8:00 PM, Jesper Pedersen <jesper(dot)pedersen(at)redhat(dot)com>
wrote:

> On 08/07/2015 12:41 AM, Amit Kapila wrote:
>
>> On Thu, Aug 6, 2015 at 9:36 PM, Robert Haas <robertmhaas(at)gmail(dot)com>
>> wrote:
>>
>>>
>>>
>>> OK, committed.
>>>
>>>
>> Thank you.
>>
>>
> Fyi, there is something in pgbench that has caused a testing regression -
> havn't tracked down what yet.
>
> Against 9.6 server (846f8c9483a8f31e45bf949db1721706a2765771)
>
> 9.6 pgbench:
> ------------
> progress: 10.0 s, 53525.0 tps, lat 1.485 ms stddev 0.523
> progress: 20.0 s, 15750.6 tps, lat 5.077 ms stddev 1.950
> ...
> progress: 300.0 s, 15636.9 tps, lat 5.114 ms stddev 1.989
>
> 9.5 pgbench:
> ------------
> progress: 10.0 s, 50119.5 tps, lat 1.587 ms stddev 0.576
> progress: 20.0 s, 51413.1 tps, lat 1.555 ms stddev 0.553
> ...
> progress: 300.0 s, 52951.6 tps, lat 1.509 ms stddev 0.657
>
>
> Both done with -c 80 -j 80 -M prepared -P 10 -T 300.
>

I will look into it.
Could you please share some of the settings used for test like
scale_factor in pgbench and shared_buffers settings or if you
have changed any other default setting in postgresql.conf?

With Regards,
Amit Kapila.
EnterpriseDB: http://www.enterprisedb.com