On 2020/07/03 13:05, Pavel Stehule wrote:
Hi
pá 3. 7. 2020 v 4:39 odesílatel Fujii Masao <[email protected]
<mailto:[email protected]>> napsal:
On 2020/07/01 7:37, Peter Geoghegan wrote:
> On Tue, Jun 30, 2020 at 6:40 AM Fujii Masao <[email protected]
<mailto:[email protected]>> wrote:
>> Ants and Andres suggested to replace the spinlock used in pgss_store()
with
>> LWLock. I agreed with them and posted the POC patch doing that. But I
think
>> the patch is an item for v14. The patch may address the reported
performance
>> issue, but may cause other performance issues in other workloads. We
would
>> need to measure how the patch affects the performance in various
workloads.
>> It seems too late to do that at this stage of v13. Thought?
>
> I agree that it's too late for v13.
Thanks for the comment!
So I pushed the patch and changed default of track_planning to off.
Maybe there can be documented so enabling this option can have a negative
impact on performance.
Yes. What about adding either of the followings into the doc?
Enabling this parameter may incur a noticeable performance penalty.
or
Enabling this parameter may incur a noticeable performance penalty,
especially when a fewer kinds of queries are executed on many
concurrent connections.
Regards,
--
Fujii Masao
Advanced Computing Technology Center
Research and Development Headquarters
NTT DATA CORPORATION
