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Re: FW: Postgres cpu & memory usage

From: Mladen Gogala <mgogala(at)vmsinfo(dot)com>
To: Machiel Richards <machielr(at)rdc(dot)co(dot)za>
Cc: pgsql-novice(at)postgresql(dot)org
Subject: Re: FW: Postgres cpu & memory usage
Date: 2010-04-08 18:49:16
Message-ID: 4BBE252C.6040106@vmsinfo.com (view raw or flat)
Thread:
Lists: pgsql-novice
top, iostat, vmstat, sar and system auditing seem to be the best 
options. You should also try PGStatspack although the output is much 
less detailed than is the case with the original statspack. Here is an 
article from a well known SUN expert:

http://blogs.sun.com/glennf/entry/pgstatspack_getting_at_postgres_performance

The product itself is available at PGFoundry.



Machiel Richards wrote:
> Hi All
>
>    I just wanted to follow up again from everyone to find out what is the
> best way we can use to monitor the CPU and memory usage used by Postgresql.
>
>    We have a meeting tomorrow to discuss the hardware requirements for our
> consolidated database server and we need these stats quite urgently.
>
>   As stated below the methods we are using are giving us inconsistent
> results and I would really appreciate some help with this.
>
>
> regards
> Machiel 
>
>
>
> -----Original Message-----
> From: pgsql-novice-owner(at)postgresql(dot)org
> [mailto:pgsql-novice-owner(at)postgresql(dot)org] On Behalf Of machielr(at)rdc(dot)co(dot)za
> Sent: 07 April 2010 11:54 AM
> To: pgsql-novice(at)postgresql(dot)org
> Subject: [NOVICE] Postgres cpu & memory usage
>
> HI All
>
>     Some more questions from me today again ....
>
>     The client we are looking after wants to look at consolidating all  
> their databases onto one Database server.
>
>    Currently they have 16 Servers and a total of 190 Databases running  
> on these (even though a lot of them will be removed after the exercise  
> leaving about 90 odd).
>
>
>     They are also running application and web servers on the same  
> servers at the moment and the plan is to move all the databases onto  
> one central consolidated database.
>
>
>     However, in order to spec the server required, I need to create a  
> report of the system usage from a postgresql point of view.
>
>
>    I have configured pg_top on all the systems, however the info  
> received seems to be incorrect in the following sence:
>
>     - When running pg_top it show the cpu usage as 100% for user  
> however when running the linux top command this differs a lot.
>      - The linux top command (monitoring all postgres related  
> processes) totals not more than 5 % cpu usage and barely 1% memory  
> usage.
>
>
>
>
>     I am not sure how to get the correct information for postgresql  
> specifically.
>
>
>    Can anyoneone perhaps assist here?
>
>
> Regards
> Machiel
>
>
>
>   


-- 
 
Mladen Gogala 
Sr. Oracle DBA
1500 Broadway
New York, NY 10036
(212) 329-5251
http://www.vmsinfo.com 
The Leader in Integrated Media Intelligence Solutions




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