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Re: SSD options, small database, ZFS

From: Bruce Momjian <bruce(at)momjian(dot)us>
To: Greg Smith <greg(at)2ndQuadrant(dot)com>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: SSD options, small database, ZFS
Date: 2011-11-22 18:10:29
Message-ID: 201111221810.pAMIATK15156@momjian.us (view raw or flat)
Thread:
Lists: pgsql-performance
Greg Smith wrote:
> The whole memorys speed topic is also much more complicated than any 
> simple explanation can cover.  How many banks of RAM you can use 
> effectively changes based on the number of CPUs and associated chipset 
> too.  Someone just sent me an explanation recently of why I was seeing 
> some strange things on my stream-scaling benchmark program.  That dove 
> into a bunch of trivia around how the RAM is actually accessed on the 
> motherboard.  One of the reasons I keep so many samples on that 
> program's page is to help people navigate this whole maze, and have some 
> data points to set expectations against.  See 
> https://github.com/gregs1104/stream-scaling for the code and the samples.

I can confirm that a Xeon E5620 CPU wants memory to be in multiples of
3, and a dual-CPU 5620 system needs memory in multiples of 6.  (I
installed 12 2GB modules.)

-- 
  Bruce Momjian  <bruce(at)momjian(dot)us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

  + It's impossible for everything to be true. +

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