From: Josh Berkus <josh@agliodbs.com>
To: Karl Denninger <karl@denninger.net>
To: pgsql-performance@postgresql.org
Subject: Re: Revisiting disk layout on ZFS systems
Date: Thu, 01 May 2014 14:34:46 -0700
Message-ID: <5362BDF6.3010400@agliodbs.com> (raw)
In-Reply-To: <WM!85d0575c8eba75877ab347c9e5e0cb8b72740c264f5d519bc918304ef2dc06a16fa45767d28402c9228a5a1f85682581!@asav-2.01.com>
References: <535E781A.5030708@denninger.net>
<WM!85d0575c8eba75877ab347c9e5e0cb8b72740c264f5d519bc918304ef2dc06a16fa45767d28402c9228a5a1f85682581!@asav-2.01.com>
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On 04/28/2014 08:47 AM, Karl Denninger wrote:
> The odd thing is that I am getting better performance with a 128k record
> size on this application than I get with an 8k one! Not only is the
> system faster to respond subjectively and can it sustain a higher TPS
> load objectively but the I/O busy percentage as measured during
> operation is MARKEDLY lower (by nearly an order of magnitude!)
Thanks for posting your experience! I'd love it even more if you could
post some numbers to go with.
Questions:
1) is your database (or the active portion thereof) smaller than RAM?
2) is this a DW workload, where most writes are large writes?
--
Josh Berkus
PostgreSQL Experts Inc.
http://pgexperts.com
--
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To: pgsql-performance@postgresql.org
Cc: josh@agliodbs.com, karl@denninger.net
Subject: Re: Revisiting disk layout on ZFS systems
In-Reply-To: <5362BDF6.3010400@agliodbs.com>
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