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4 Answers

Thierry Godin France

--Thierry Godin--
| 8 7 10
Collegien, France
--Thierry Godin--


Thierry Godin France
6/4/14, 7:40 AM

Hi Nicolas,

Here is the tunning I apply on my (5) servers  (Debian Wheezy)

  1. create an empty file pg_memory.sh in /root directory and copy/paste the code below :

page_size=`getconf PAGE_SIZE`
phys_pages=`getconf _PHYS_PAGES`
shmall=`expr $phys_pages / 2`
shmmax=`expr $shmall \* $page_size`
echo kernel.shmmax = $shmmax
echo kernel.shmall = $shmall
echo 'Edit /etc/sysctl.conf and apply with : sysctl -p'

  1. as root execute command :

bash pg_memory.sh

  1. As notified in the script, copy/paste the result of  the script in /etc/sysctl.conf and execute command :

sysctl -p

  1. You should now have these  parameters at the end of  sysctl.conf (this is an example):

kernel.shmmax = 2107961344
kernel.shmall = 514639

  1. now install pgtune (apt-get install pgtune)
  2. as root, execute command :

pgtune -i /etc/postgresql/9.1/main/postgresql.conf  -o pgsql.conf

  1. This will duplicate the postgresql.conf and add some parameters at the end of the file.
  2. Just open the new file (/root/pgsql.conf)
  3. Copy/past the end of the file (lines with pgtune wizard as comment) in the real one ( /etc/postgresql/9.1/main/postgresql.conf ) . Backup it first!
  4. Restart the server

Note : change path to postgresql.conf according to your OS/Server

PgTune will set parameters according to your system (OS, HD, Memory, etc).

I always trust pgtune and copy/paste "as is" in postgresql.conf. For now, all my servers are running well.

Hope this helps

Lithin T United Arab Emirates
8/21/15, 5:37 PM

Dear Thierry Godin,
I have tried tune my postgresql with pg_tune, but still the postgesql is using around 90% of my total cpu(6 core with 1.8Ghz) when taking reports.

Any other solution you have to improve the performance in taking reports like stock valuation ?


Gustavo Argentina

| 2 2 6
Buenos Aires, Argentina

Python developer, big fan of sailing

Gustavo Argentina
7/23/13, 3:39 PM

I think the configuration depends on your installation demands. So far we did not get into any trouble with PostgreSQL, other than VACUUM. The later process will surprise you since once it gets started, it virtually stops the server and affects its performance. But you can get it under control.

1 Comment
Gustavo Argentina
7/23/13, 3:42 PM

BTW, I think you can get started by taking a look at this page:


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