Re: Postgresql works too slow

От: Steve Poe
Тема: Re: Postgresql works too slow
Дата: ,
Msg-id: 426348BD.3040002@sfnet.cc
(см: обсуждение, исходный текст)
Ответ на: Postgresql works too slow  ("Nurlan Mukhanov (AL/EKZ)")
Ответы: Re: Postgresql works too slow  (Tom Lane)
Список: pgsql-performance

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Postgresql works too slow  ("Nurlan Mukhanov (AL/EKZ)", )
 Re: Postgresql works too slow  (Steve Poe, )
  Re: Postgresql works too slow  (Tom Lane, )
   Re: Postgresql works too slow  (Christopher Kings-Lynne, )
 Re: Postgresql works too slow  (Simon Riggs, )
  Re: Postgresql works too slow  (Brad Nicholson, )

Nurlan,

Try enabliing your checkpoint_segments. In my example, our database
restore took 75mins. After enabling checkpoints_segments to 20, we cut
it down to less than 30 minutes.  Is your pg_xlog on a seperate disc..or
at least a partition? This will help too. A checkpoints_segments of 20,
if memory serves correctly, will occupy around 800-900M of disc space in
pg_xlog.

Steve Poe


Nurlan Mukhanov (AL/EKZ) wrote:

>Hello.
>
>I'm trying to restore my database from dump in several parrallel processes, but restore process works too slow.
>Number of rows about 100 000 000,
>RAM: 8192M
>CPU: Ultra Sparc 3
>Number of CPU: 4
>OS: SunOS sun 5.8
>RDBMS: PostgreSQL 8.0
>
>====================            prstat info            ====================
>
>   PID USERNAME  SIZE   RSS STATE  PRI NICE      TIME  CPU PROCESS/NLWP
> 14231 postgres   41M   37M sleep   58    0   0:00.01 0.2% postgres/1
> 14136 postgres   41M   37M sleep   58    0   0:00.03 0.2% postgres/1
> 14211 postgres   41M   37M sleep   58    0   0:00.01 0.2% postgres/1
> 14270 postgres   41M   37M sleep   58    0   0:00.00 0.2% postgres/1
> 13767 postgres   41M   37M sleep   58    0   0:00.18 0.2% postgres/1
> 13684 postgres   41M   36M sleep   58    0   0:00.14 0.2% postgres/1
>
> NPROC USERNAME  SIZE   RSS MEMORY      TIME  CPU
>    74 root      272M  191M   2.3%   0:26.29  24%
>   124 postgres 1520M 1306M    16%   0:03.05 5.0%
>
>
>How to encrease postgresql speed? Why postgres took only 5.0% of CPU time?
>
>Nurlan Mukhanov
>
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