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Re: Huge amount of memory consumed during transaction

From: Alvaro Herrera <alvherre(at)commandprompt(dot)com>
To: henk de wit <henk53602(at)hotmail(dot)com>
Cc: Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com>, "pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org>
Subject: Re: Huge amount of memory consumed during transaction
Date: 2007-10-17 20:40:58
Message-ID: 20071017204058.GR5737@alvh.no-ip.org (view raw or flat)
Thread:
Lists: pgsql-performance
henk de wit escribió:
> > How is the memory consumed?  How are you measuring it? I assume you
> > mean the postgres process that is running the query uses the memory.
> > If so, which tool(s) are you using and what's the output that shows it
> > being used?
> 
> It's periodically measured and recorded by a script from which the relevant parts are:
> 
> GET_VSZ="ps aux | grep $REQ_GREP | grep -v grep | grep -v $$ | awk '{print \$5}'
>  | sort -n | tail -n1";
> GET_RSS="ps aux | grep $REQ_GREP | grep -v grep | grep -v $$ | awk '{print \$6}'
>  | sort -n | tail -n1";

Huh, this seems really ugly, have you tried something like just

$ ps -o cmd:50,vsz,rss -C postmaster
CMD                                                   VSZ   RSS
/pgsql/install/00head/bin/postmaster                51788  3992
postgres: writer process                            51788  1060
postgres: wal writer process                        51788   940
postgres: autovacuum launcher process               51924  1236
postgres: stats collector process                   22256   896


-- 
Alvaro Herrera                                http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.

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