From: | Josh Berkus <josh(at)agliodbs(dot)com> |
---|---|
To: | Karl Denninger <karl(at)denninger(dot)net>, pgsql-performance(at)postgresql(dot)org |
Subject: | Re: Revisiting disk layout on ZFS systems |
Date: | 2014-05-01 21:34:46 |
Message-ID: | 5362BDF6.3010400@agliodbs.com |
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Lists: | pgsql-performance |
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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