Re: performance on new linux box

От: Tom Lane
Тема: Re: performance on new linux box
Дата: ,
Msg-id: 11690.1278549556@sss.pgh.pa.us
(см: обсуждение, исходный текст)
Ответ на: 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", )

Ryan Wexler <> writes:
> Postgresql was previously running on a single cpu linux machine with 2 gigs
> of memory and a single sata drive (v8.3).  Basically a desktop with linux on
> it.  I experienced slow performance.

> So, I finally moved it to a real server.  A dually zeon centos machine with
> 6 gigs of memory and raid 10, postgres 8.4.  But, I am now experiencing even
> worse performance issues.

I'm wondering if you moved to a kernel+filesystem version that actually
enforces fsync, from one that didn't.  If so, the apparently faster
performance on the old box was being obtained at the cost of (lack of)
crash safety.  That probably goes double for your windows-box comparison
point.

You could try test_fsync from the Postgres sources to confirm that
theory, or do some pgbench benchmarking to have more quantifiable
numbers.

See past discussions about write barriers in this list's archives for
more detail.

            regards, tom lane


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