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Re: how test postgresql.conf settings?

From: Arnau <arnaulist(at)andromeiberica(dot)com>
To: Chandra Sekhar Surapaneni <chandu(at)positivenetworks(dot)net>
Cc: pgsql-admin(at)postgresql(dot)org
Subject: Re: how test postgresql.conf settings?
Date: 2006-02-22 09:03:52
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-admin
Sorry for answering so late, but I didn't notice your answer...

Chandra Sekhar Surapaneni wrote:
> If you HUP the database or reload the database the changes will take 
> effect. Only in a very few cases you will have to restart the database. 
> Can you give us more information regarding what changes you made to the 
> postgresql.conf?

   I was tweaking the Resource usage part shared_buffers, work_mem, ... 
The problem is I was restarting the database with:
  /etc/init.d/postgresql restart

The problem is that the result I was getting after the restart were much 
better than if I reboot the machine. So I don't know why of that big 
difference, if due to postgresql or due the kernel cache or where...

> -Chandra Sekhar Surapaneni
> ------------------------------------------------------------------------
> *From:* pgsql-admin-owner(at)postgresql(dot)org on behalf of Arnau Rebassa 
> Villalonga
> *Sent:* Wed 2/15/2006 4:39 AM
> *To:* pgsql-admin(at)postgresql(dot)org
> *Subject:* [ADMIN] how test postgresql.conf settings?
> Hi all,
>    I'm testing different configurations of postgresql 8.1 running on
> debian. The method I was following was:
>    - change the postgresql.conf
>    - restart postgres (/etc/init.d/postgresql restart )
>    - execute my test queries
>   I have noticed that this is not enough to flush the cache, I don't
> know where it is, if at the raid controller, at OS or at postgresql
> itself. Reboot the machine I don't think it's a good solution because it
> takes quite long. Do you have any suggestion? BTW is there any tool to
> stress the DB, I mean, create a set of queries to execute and throw a
> configurable set of concurrent connections to check the performance?


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