Re: 8.4.1 ubuntu karmic slow createdb

From: Thomas Kellerer
Subject: Re: 8.4.1 ubuntu karmic slow createdb
Date: ,
Msg-id: hhbglj$2vc$1@ger.gmane.org
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In response to: Re: 8.4.1 ubuntu karmic slow createdb  (Michael Clemmons)
List: pgsql-performance

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8.4.1 ubuntu karmic slow createdb  (Michael Clemmons, )
 Re: 8.4.1 ubuntu karmic slow createdb  (Andres Freund, )
  Re: 8.4.1 ubuntu karmic slow createdb  (Michael Clemmons, )
   Re: 8.4.1 ubuntu karmic slow createdb  (Andres Freund, )
    Re: 8.4.1 ubuntu karmic slow createdb  (Nikolas Everett, )
     Re: 8.4.1 ubuntu karmic slow createdb  ("Joshua D. Drake", )
      Re: 8.4.1 ubuntu karmic slow createdb  (Nikolas Everett, )
       Re: 8.4.1 ubuntu karmic slow createdb  ("Joshua D. Drake", )
        Re: 8.4.1 ubuntu karmic slow createdb  (Nikolas Everett, )
         Re: 8.4.1 ubuntu karmic slow createdb  (Scott Marlowe, )
          Re: 8.4.1 ubuntu karmic slow createdb  (Scott Carey, )
           Re: 8.4.1 ubuntu karmic slow createdb  (Scott Marlowe, )
         Re: 8.4.1 ubuntu karmic slow createdb  (Scott Mead, )
          Re: 8.4.1 ubuntu karmic slow createdb  (Scott Marlowe, )
           Re: 8.4.1 ubuntu karmic slow createdb  (Robert Haas, )
          Re: 8.4.1 ubuntu karmic slow createdb  (Greg Smith, )
           Re: 8.4.1 ubuntu karmic slow createdb  (Michael Clemmons, )
            Re: 8.4.1 ubuntu karmic slow createdb  (Scott Marlowe, )
             Re: 8.4.1 ubuntu karmic slow createdb  (Andres Freund, )
            Re: 8.4.1 ubuntu karmic slow createdb  (Michael Clemmons, )
             Re: 8.4.1 ubuntu karmic slow createdb  (Andres Freund, )
              Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Andres Freund, )
               Re: [HACKERS] Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Andres Freund, )
                Re: [HACKERS] Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Andres Freund, )
                 Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Greg Stark, )
                  Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Greg Stark, )
                   Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Greg Stark, )
                    Re: [HACKERS] Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Andres Freund, )
                    Re: Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Greg Smith, )
                    Re: [HACKERS] Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Greg Smith, )
                   Re: [HACKERS] Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Andres Freund, )
                   Re: [HACKERS] Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Tom Lane, )
                    Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Greg Stark, )
                     Re: [HACKERS] Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Tom Lane, )
                      Re: [HACKERS] Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Robert Haas, )
                       Re: [HACKERS] Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Andres Freund, )
                        Re: [HACKERS] Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Robert Haas, )
                         Re: [HACKERS] Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Andres Freund, )
                         Re: [HACKERS] Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Tom Lane, )
                          Re: [HACKERS] Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Robert Haas, )
                           Re: [HACKERS] Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Greg Stark, )
                            Re: [HACKERS] Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Andres Freund, )
                            Re: [HACKERS] Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Robert Haas, )
                             Re: [HACKERS] Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Andres Freund, )
                              Re: [HACKERS] Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Greg Smith, )
                               Re: [HACKERS] Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Andres Freund, )
                                Re: [HACKERS] Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Robert Haas, )
                                 Re: [HACKERS] Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Greg Smith, )
                                  Re: [HACKERS] Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Tom Lane, )
                                   Re: [HACKERS] Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Robert Haas, )
                                    Re: [HACKERS] Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Andres Freund, )
                                     Re: [HACKERS] Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Andres Freund, )
                                      Re: [HACKERS] Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Alvaro Herrera, )
                                       Re: [HACKERS] Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Robert Haas, )
                                        Re: [HACKERS] Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Andres Freund, )
                                        Re: [HACKERS] Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Greg Stark, )
                                         Re: [HACKERS] Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Andres Freund, )
                                        Re: [HACKERS] Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Andres Freund, )
                     Re: [HACKERS] Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Andres Freund, )
                     Re: [HACKERS] Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Robert Haas, )
                   Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Andres Freund, )
                  Re: Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Andres Freund, )
               Re: [HACKERS] Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Tom Lane, )
                Re: [HACKERS] Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Andres Freund, )
                 Re: [HACKERS] Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Greg Smith, )
                  Re: [HACKERS] Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Andres Freund, )
                   Re: [HACKERS] Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Michael Clemmons, )
                    Re: [HACKERS] Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Andres Freund, )
                     Re: [HACKERS] Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Michael Clemmons, )
                      Re: [HACKERS] Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Andres Freund, )
                   Re: [HACKERS] Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Greg Stark, )
                    Re: [HACKERS] Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Andres Freund, )
                Re: [HACKERS] Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Andres Freund, )
               Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Greg Stark, )
                Re: [HACKERS] Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (Andres Freund, )
                Re: [PERFORM] Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1ubuntu karmic slow createdb)  (Andres Freund, )
                 Re: Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (, )
                Re: Re: Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)  (, )
            Re: 8.4.1 ubuntu karmic slow createdb  (Thomas Kellerer, )
       Re: 8.4.1 ubuntu karmic slow createdb  ("Joshua D. Drake", )
     Re: 8.4.1 ubuntu karmic slow createdb  ("Joshua D. Drake", )

Michael Clemmons wrote on 11.12.2009 23:52:
> Thanks all this has been a good help.
> I don't have control(or easy control) over unit tests creating/deleting
> databases since Im using the django framework for this job.  Createdb
> takes 12secs on my system(9.10 pg8.4 and ext4)  which is impossibly slow
> for running 200unittests.

I wonder if you could simply create one database, and then a new schema for each of the tests.

After creating the schema you could alter the search_path for the "unit test user" and it would look like a completely
newdatabase. 

Thomas




pgsql-performance by date:

From: Andres Freund
Date:
Subject: Re: [HACKERS] Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)
From: Greg Stark
Date:
Subject: Re: [HACKERS] Faster CREATE DATABASE by delaying fsync (was 8.4.1 ubuntu karmic slow createdb)