Re: [GENERAL] Creation of tsearch2 index is very slow

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От Steinar H. Gunderson
Тема Re: [GENERAL] Creation of tsearch2 index is very slow
Дата
Msg-id 20060120224915.GA26821@uio.no
обсуждение исходный текст
Ответ на Re: [GENERAL] Creation of tsearch2 index is very slow  (Ron)
Список pgsql-performance
Дерево обсуждения
Re: [GENERAL] Creation of tsearch2 index is very slow  (Tom Lane, )
 Re: [GENERAL] Creation of tsearch2 index is very slow  (Martijn van Oosterhout, )
  Re: [GENERAL] Creation of tsearch2 index is very slow  (Tom Lane, )
   Re: [GENERAL] Creation of tsearch2 index is very slow  (Martijn van Oosterhout, )
    Re: [GENERAL] Creation of tsearch2 index is very slow  (Tom Lane, )
     Re: [GENERAL] Creation of tsearch2 index is very slow  (Martijn van Oosterhout, )
      Re: [GENERAL] Creation of tsearch2 index is very slow  ("Steinar H. Gunderson", )
      Re: [GENERAL] Creation of tsearch2 index is very slow  (Tom Lane, )
       Re: [GENERAL] Creation of tsearch2 index is very slow  ("Steinar H. Gunderson", )
        Re: [GENERAL] Creation of tsearch2 index is very slow  (Ron, )
         Re: [GENERAL] Creation of tsearch2 index is very slow  ("Steinar H. Gunderson", )
       Re: [GENERAL] Creation of tsearch2 index is very slow  (Martijn van Oosterhout, )
       Re: [GENERAL] Creation of tsearch2 index is very slow  ("Steinar H. Gunderson", )
      Re: [GENERAL] Creation of tsearch2 index is very slow  (Ron, )
       Re: [GENERAL] Creation of tsearch2 index is very slow  ("Steinar H. Gunderson", )
       Re: [GENERAL] Creation of tsearch2 index is very slow  (Tom Lane, )
        Re: [GENERAL] Creation of tsearch2 index is very slow  ("Steinar H. Gunderson", )
         Re: [GENERAL] Creation of tsearch2 index is very slow  (Tom Lane, )
          Re: [GENERAL] Creation of tsearch2 index is very slow  ("Steinar H. Gunderson", )
           Re: [GENERAL] Creation of tsearch2 index is very slow  (Tom Lane, )
            Re: [GENERAL] Creation of tsearch2 index is very slow  ("Steinar H. Gunderson", )
            Re: [GENERAL] Creation of tsearch2 index is very slow  ("Craig A. James", )
            Re: [GENERAL] Creation of tsearch2 index is very  (Ron, )
             Re: [GENERAL] Creation of tsearch2 index is very  (Oleg Bartunov, )
              Re: [GENERAL] Creation of tsearch2 index is very  (Ron, )
             Re: [GENERAL] Creation of tsearch2 index is very  (Tom Lane, )
              Re: [GENERAL] Creation of tsearch2 index is very  (David Lang, )
               Re: [GENERAL] Creation of tsearch2 index is very  (Tom Lane, )
              Re: [GENERAL] Creation of tsearch2 index is very  (Ron, )
               Re: [GENERAL] Creation of tsearch2 index is very  (Alvaro Herrera <-ip.org>, )
                Re: [GENERAL] Creation of tsearch2 index is very  (Ron, )
                 Re: [GENERAL] Creation of tsearch2 index is very  ("Craig A. James", )
                  Re: [GENERAL] Creation of tsearch2 index is very  (Ron, )
        Re: [GENERAL] Creation of tsearch2 index is very slow  (Martijn van Oosterhout, )
         Re: [GENERAL] Creation of tsearch2 index is very slow  (Oleg Bartunov, )
          Re: [GENERAL] Creation of tsearch2 index is very slow  (Martijn van Oosterhout, )
           Re: [GENERAL] Creation of tsearch2 index is very slow  (Oleg Bartunov, )
            Re: [GENERAL] Creation of tsearch2 index is very slow  (Martijn van Oosterhout, )
           Re: [GENERAL] Creation of tsearch2 index is very slow  (Oleg Bartunov, )
       Re: [GENERAL] Creation of tsearch2 index is very slow  (Martijn van Oosterhout, )
      Re: [GENERAL] Creation of tsearch2 index is very  (Ron, )
 Re: [GENERAL] Creation of tsearch2 index is very  (Oleg Bartunov, )
On Fri, Jan 20, 2006 at 05:46:34PM -0500, Ron wrote:
> For an even more extreme speedup, don't most modern CPUs have an asm
> instruction that counts the bits (un)set (AKA "population counting")
> in various size entities (4b, 8b, 16b, 32b, 64b, and 128b for 64b
> CPUs with SWAR instructions)?

None in the x86 series that I'm aware of, at least.

You have instructions for finding the highest set bit, though.

/* Steinar */
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