Re: performance on new linux box

От: Andy Colson
Тема: Re: performance on new linux box
Дата: ,
Msg-id: 4C3CF611.1090702@squeakycode.net
(см: обсуждение, исходный текст)
Ответ на: Re: performance on new linux box  (Ryan Wexler)
Список: 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 07/11/2010 03:02 PM, Ryan Wexler wrote:

>
> Well I got me a new raid card, MegaRAID 8708EM2, fully equipped with
> BBU and read and write caching are enabled.  It completely solved my
> performance problems.  Now everything is way faster than the previous
> server.  Thanks for all the help everyone.
>
> One question I do have is this card has a setting called Read Policy
> which apparently helps with sequentially reads.  Do you think that is
> something I should enable?
>
>
>

I would think it depends on your usage.  If you use clustered indexes (and understand how/when they help) then enabling
itwould help (cuz clustered is assuming sequential reads). 

or if you seq scan a table, it might help (as long as the table is stored relatively close together).

But if you have a big db, that doesnt fit into cache, and you bounce all over the place doing seeks, I doubt it'll
help.

-Andy


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