Re: performance on new linux box

From: David Boreham
Subject: Re: performance on new linux box
Date: ,
Msg-id: 4C362C1C.7060509@boreham.org
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In response to: Re: performance on new linux box  (Ryan Wexler)
List: pgsql-performance

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performance on new linux box  (Ryan Wexler, )
 Re: performance on new linux box  (Tom Lane, )
 Re: performance on new linux box  (Rob Wultsch, )
 Re: performance on new linux box  (Andy Colson, )
  Re: performance on new linux box  (Eliot Gable, )
   Re: performance on new linux box  ("Kevin Grittner", )
    Re: performance on new linux box  (Eliot Gable, )
     Re: performance on new linux box  ("Kevin Grittner", )
      Re: performance on new linux box  (Ryan Wexler, )
       Re: performance on new linux box  ("Joshua D. Drake", )
       Re: performance on new linux boxeradmin(11983)i: STATEMENT: update license set expires= '2010-06-15' where lic  (John Rouillard, )
       Re: performance on new linux box  (Craig James, )
       Re: performance on new linux box  (Russell Smith, )
        Re: performance on new linux box  (Samuel Gendler, )
         Re: performance on new linux box  (Ryan Wexler, )
          Re: performance on new linux box  (Greg Smith, )
          Re: performance on new linux box  (Andy Colson, )
       Re: performance on new linux box  ("Joshua D. Drake", )
 Re: performance on new linux box  ("Pierre C", )
 Fwd: performance on new linux box  (Ryan Wexler, )
  Re: performance on new linux box  (Jochen Erwied, )
   Re: performance on new linux box  (Ryan Wexler, )
    Re: performance on new linux box  ("Kevin Grittner", )
    Re: performance on new linux box  (Jochen Erwied, )
     Re: performance on new linux box  (Ryan Wexler, )
      Re: performance on new linux box  (Ben Chobot, )
      Re: performance on new linux box  ("Kevin Grittner", )
       Re: performance on new linux box  (Ryan Wexler, )
        Re: performance on new linux box  (David Boreham, )
        Re: performance on new linux box  ("Kevin Grittner", )
        Re: performance on new linux box  (Craig James, )
         Re: performance on new linux box  (<>, )
          Re: performance on new linux box  (Craig James, )
           Re: performance on new linux box  (Scott Carey, )
            Re: performance on new linux box  (Ben Chobot, )
             Re: performance on new linux box  (Scott Carey, )
              Re: performance on new linux box  (Ben Chobot, )
               Re: performance on new linux box  (Ryan Wexler, )
                Re: performance on new linux box  (Ben Chobot, )
                 Re: performance on new linux box  (Craig Ringer, )
               Re: performance on new linux box  (Scott Carey, )
                Re: performance on new linux box  (Ben Chobot, )
                Re: performance on new linux box  (Greg Smith, )
              Re: performance on new linux box  (Scott Marlowe, )
               Re: performance on new linux box  (Scott Carey, )
               Re: performance on new linux box  (Craig Ringer, )
            Re: performance on new linux box  (Ryan Wexler, )
          Re: performance on new linux box  (David Boreham, )
   Re: performance on new linux box  (Ryan Wexler, )
    Re: performance on new linux box  (Jochen Erwied, )
 Re: performance on new linux box  (Ben Chobot, )
  Re: performance on new linux box  ("Pierre C", )

On 7/8/2010 1:47 PM, Ryan Wexler wrote:
> Thanks for the explanations that makes things clearer.  It still
> amazes me that it would account for a 5x change in IO.

The buffering allows decoupling of the write rate from the disk rotation
speed.
Disks don't spin that fast, at least not relative to the speed the CPU
is running at.





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From: "Joshua D. Drake"
Date:
Subject: Re: performance on new linux box
From: Craig Ringer
Date:
Subject: Re: Need help in performance tuning.