From: | Metin Doslu <metin(at)citusdata(dot)com> |
---|---|
To: | Andres Freund <andres(at)2ndquadrant(dot)com> |
Cc: | postgres performance list <pgsql-performance(at)postgresql(dot)org>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Claudio Freire <klaussfreire(at)gmail(dot)com> |
Subject: | Re: [HACKERS] Parallel Select query performance and shared buffers |
Date: | 2013-12-05 15:46:44 |
Message-ID: | CAL1dPce25L_X2a_QebJyC4rHhmYVaR8xQBud0y799opY9JKqpw@mail.gmail.com |
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Lists: | pgsql-hackers pgsql-performance |
> You could try my lwlock-scalability improvement patches - for some
> workloads here, the improvements have been rather noticeable. Which
> version are you testing?
I tried your patches on next link. As you suspect I didn't see any
improvements. I tested it on PostgreSQL 9.2 Stable.
On Wed, Dec 4, 2013 at 8:26 PM, Andres Freund <andres(at)2ndquadrant(dot)com>wrote:
> On 2013-12-04 20:19:55 +0200, Metin Doslu wrote:
> > - When we increased NUM_BUFFER_PARTITIONS to 1024, this problem is
> > disappeared for 8 core machines and come back with 16 core machines on
> > Amazon EC2. Would it be related with PostgreSQL locking mechanism?
>
> You could try my lwlock-scalability improvement patches - for some
> workloads here, the improvements have been rather noticeable. Which
> version are you testing?
>
> Greetings,
>
> Andres Freund
>
> --
> Andres Freund http://www.2ndQuadrant.com/
> PostgreSQL Development, 24x7 Support, Training & Services
>
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