From: Andres Freund <andres@2ndquadrant.com>
To: Metin Doslu <metin@citusdata.com>
Cc: postgres performance list <pgsql-performance@postgresql.org>
Cc: pgsql-hackers <pgsql-hackers@postgresql.org>
Cc: Amit Kapila <amit.kapila16@gmail.com>
Cc: Claudio Freire <klaussfreire@gmail.com>
Subject: Re: [HACKERS] Parallel Select query performance and shared buffers
Date: Wed, 4 Dec 2013 19:26:01 +0100
Message-ID: <20131204182601.GF7383@awork2.anarazel.de> (raw)
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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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Subject: Re: [HACKERS] Parallel Select query performance and shared buffers
In-Reply-To: <20131204182601.GF7383@awork2.anarazel.de>
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