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From: Richard Huxton <dev@archonet.com>
To: Craig A. James <cjames@modgraph-usa.com>
Cc: Russell Smith <mr-russ@pws.com.au>
Cc: pgsql-performance@postgresql.org
Subject: Re: Postgres server crash
Date: Thu, 16 Nov 2006 17:09:45 +0000
Message-ID: <455C9B59.7000402@archonet.com> (raw)
In-Reply-To: <455C993E.5050403@modgraph-usa.com>
References: <ce4072df0610201305u7836dc7bn437ec0aaf1c3e25f@mail.gmail.com>
	<b42b73150610201811m84369f7kc7d58b39aed3ad73@mail.gmail.com>
	<ce4072df0610230810t5d66bbb8xf1e9c0ed71b6b6c0@mail.gmail.com>
	<20061023215913.GW26892@nasby.net>
	<ce4072df0610240617s72f35540odd3d4e0903313b63@mail.gmail.com>
	<20061025001709.GA26892@nasby.net>
	<453EF7C4.2040105@modgraph-usa.com>
	<455BCAE8.8010905@modgraph-usa.com>
	<455BCCCD.2020701@pws.com.au>
	<455C420D.8090209@archonet.com>
	<455C993E.5050403@modgraph-usa.com>

Craig A. James wrote:
> Russell Smith wrote:
>>> For the third time today, our server has crashed...
>>
>> I would guess it's the linux OOM if you are running linux. You need to 
>> turn off killing of processes when you run out of memory.  Are you 
>> getting close to running out of memory?
> 
> Good suggestion, it was a memory leak in an add-on library that we plug 
> in to the Postgres server.
> 
> OOM?   Can you give me a quick pointer to what this acronym stands for
> and how I can reconfigure it? 

Out Of Memory

 > It sounds like a "feature" old UNIX
> systems like SGI IRIX had, where the system would allocate virtual 
> memory that it didn't really have, then kill your process if you tried 
> to use it. 

That's it.

 > I.e. malloc() would never return NULL even if swap space was
> over allocated.  Is this what you're talking about?  Having this enabled 
> on a server is deadly for reliability.

Indeed. See the manuals for details. Section 16.4.3

http://www.postgresql.org/docs/8.1/static/kernel-resources.html#AEN18128

-- 
   Richard Huxton
   Archonet Ltd



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