Re: Guideline To Resolve LWLock:SubtransControlLock - Mailing list pgsql-performance

From Alvaro Herrera
Subject Re: Guideline To Resolve LWLock:SubtransControlLock
Date
Msg-id 20180820210027.iu3pryzkfssmptco@alvherre.pgsql
Whole thread Raw
In response to Re: Guideline To Resolve LWLock:SubtransControlLock  (Fred Habash <fmhabash@gmail.com>)
List pgsql-performance
On 2018-Aug-20, Fred Habash wrote:

> How do we go about calculating appropriate values for these two parameters ...

I don't know a lot about your system, so don't have anything to go on.
Also, Aurora is mostly unknown to me.  What did Amazon say?

> > 'NUM_SUBTRANS_BUFFERS'?
> TOTAL_MAX_CACHED_SUBXIDS
> 
> And do both require a recompile?

Yes.  But maybe they'll just move the contention point a little bit
backwards without actually fixing anything.

-- 
Álvaro Herrera                https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services


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