Re: Per thread Connection memory

El vie, 29-01-2016 a las 14:18 +0100, Thorsten Schöning escribió:
> Guten Tag Ankur Kaushik,
> am Freitag, 29. Januar 2016 um 13:16 schrieben Sie:
>
> > To Kill idle connection in every 10 sec , But after 15 -30 Min top
> > command show as below
>
> Killing idle connections is completely pointless, because those are
> kept open for performance reasons, pgbouncer is designed to keep
> connections open and idle, so that applications use them faster. If
> you want less idle connections, reduce the configuration for those in
> pgbouncer, but in the end you defeat its purpose that way.

+1. If you don't want to keep many connections open in idle state, you
can configure them at pgbouncer level or pool configuration in tomcat
or application level.

>
>
> > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+
> > COMMAND
> > 10454 root 20 0 7101m 2.4g 11m S 751.3 15.4
> > 84:47.60 java
>
> You problem is obviously that you don't have any clue what your
> problem is, therefore you're just guessing things around. Don't do
> that, at least look at the logs of your Tomcat, you may even use Java
> Mission Control to monitor the performance of Tomcat and so on. This
> high load might even be the result of your script introducing some
> kind of a race condition, where you kill a connection just in that
> moment where it was given to a using process in Tomcat.

Java is consuming 7/8 core of cpu, so i think you your look closer into
tomcat and java processes.

How about your work_mem parameter and top stats relatives of postgresql
server ?

>
> If your problem is with Tomcat consuming too much memory or having
> unexplainable high CPU load, don't waste your time with advancing the
> complexity of your setup by installing pgbouncer. Focus on Tomcat and
> its logs first.

+1

>
> Mit freundlichen Grüßen,
>
> Thorsten Schöning
>
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