Re: Scalability in postgres

От: Kevin Grittner
Тема: Re: Scalability in postgres
Дата: ,
Msg-id: 4A263DB0.EE98.0025.1@wicourts.gov
(см: обсуждение, исходный текст)
Ответ на: Re: Scalability in postgres  (James Mansion)
Ответы: Re: Scalability in postgres  (Dimitri)
Re: Scalability in postgres  (James Mansion)
Список: pgsql-performance

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Scalability in postgres  (Fabrix, )
 Re: Scalability in postgres  (David Rees, )
  Re: Scalability in postgres  (Fabrix, )
   Re: Scalability in postgres  (Scott Mead, )
    Re: Scalability in postgres  (Fabrix, )
   Re: Scalability in postgres  (Scott Marlowe, )
 Re: Scalability in postgres  (Scott Marlowe, )
  Re: Scalability in postgres  (Fabrix, )
  Re: Scalability in postgres  (Flavio Henrique Araque Gurgel, )
   Re: Scalability in postgres  (Fabrix, )
    Re: Scalability in postgres  (Scott Marlowe, )
    Re: Scalability in postgres  (Flavio Henrique Araque Gurgel, )
     Re: Scalability in postgres  (Greg Smith, )
      Re: Scalability in postgres  (Grzegorz Jaśkiewicz, )
       Re: Scalability in postgres  (Scott Marlowe, )
       Re: Scalability in postgres  (Scott Marlowe, )
        Re: Scalability in postgres  (Grzegorz Jaśkiewicz, )
         Re: Scalability in postgres  (Scott Marlowe, )
          Re: Scalability in postgres  (Grzegorz Jaśkiewicz, )
           Re: Scalability in postgres  (Scott Marlowe, )
            Re: Scalability in postgres  (Grzegorz Jaśkiewicz, )
             Re: Scalability in postgres  (Scott Marlowe, )
         Re: Scalability in postgres  (Ron Mayer, )
       Re: Scalability in postgres  (Greg Smith, )
        Re: Scalability in postgres  (Scott Mead, )
         Re: Scalability in postgres  (Scott Marlowe, )
         Re: Scalability in postgres  (Fabrix, )
          Re: Scalability in postgres  (Scott Mead, )
      Re: Scalability in postgres  (Fabrix, )
       Re: Scalability in postgres  (Greg Smith, )
      Re: Scalability in postgres  (Scott Carey, )
       Re: Scalability in postgres  (Greg Smith, )
        Re: Scalability in postgres  (Scott Marlowe, )
         Re: Scalability in postgres  (Greg Smith, )
       Re: Scalability in postgres  (Fabrix, )
        Re: Scalability in postgres  (Scott Carey, )
      Re: Scalability in postgres  (James Mansion, )
       Re: Scalability in postgres  ("Kevin Grittner", )
        Re: Scalability in postgres  (Dimitri, )
         Re: Scalability in postgres  ("Kevin Grittner", )
          Re: Scalability in postgres  (Scott Carey, )
           Re: Scalability in postgres  (Robert Haas, )
            Re: Scalability in postgres  (Scott Carey, )
             Re: Scalability in postgres  (Robert Haas, )
              Re: Scalability in postgres  (Scott Carey, )
               Re: Scalability in postgres  (Robert Haas, )
              Re: Scalability in postgres  (, )
               Re: Scalability in postgres  (Robert Haas, )
                Re: Scalability in postgres  (Greg Smith, )
                 Re: Scalability in postgres  (, )
                  Re: Scalability in postgres  (Robert Haas, )
                 Re: Scalability in postgres  (Mark Mielke, )
                  Re: Scalability in postgres  (Greg Smith, )
                   Re: Scalability in postgres  (Robert Haas, )
                 Re: Scalability in postgres  (Craig James, )
          Re: Scalability in postgres  (Dimitri, )
           Re: Scalability in postgres  (Marc Cousin, )
        Re: Scalability in postgres  (James Mansion, )
         Re: Scalability in postgres  ("Kevin Grittner", )
          Re: Scalability in postgres  (Mark Mielke, )
           Re: Scalability in postgres  (, )
            Re: Scalability in postgres  (Mark Mielke, )
             Re: Scalability in postgres  (, )
           Re: Scalability in postgres  ("Kevin Grittner", )
           Re: Scalability in postgres  (Greg Smith, )
          Re: Scalability in postgres  (Scott Carey, )
           Re: Scalability in postgres  ("Kevin Grittner", )
         Re: Scalability in postgres  ("Kevin Grittner", )
 Re: Scalability in postgres  (Jeff Janes, )
  Re: Scalability in postgres  (Tom Lane, )
   Re: Scalability in postgres  (Jeff Janes, )
  Re: Scalability in postgres  ("", )

James Mansion <> wrote:

> I'm sure most of us evaluating Postgres from a background in Sybase
> or SQLServer would regard 5000 connections as no big deal.

Sure, but the architecture of those products is based around all the
work being done by "engines" which try to establish affinity to
different CPUs, and loop through the various tasks to be done.  You
don't get a context switch storm because you normally have the number
of engines set at or below the number of CPUs.  The down side is that
they spend a lot of time spinning around queue access to see if
anything has become available to do -- which causes them not to play
nice with other processes on the same box.

If you do connection pooling and queue requests, you get the best of
both worlds.  If that could be built into PostgreSQL, it would
probably reduce the number of posts requesting support for bad
configurations, and help with benchmarks which don't use proper
connection pooling for the product; but it would actually not add any
capability which isn't there if you do your homework....

-Kevin


В списке pgsql-performance по дате сообщения:

От: Erik Aronesty
Дата:
Сообщение: Re: degenerate performance on one server of 3
От: Scott Carey
Дата:
Сообщение: Re: Scalability in postgres