Re: Out of Memory - 8.2.4 - Mailing list pgsql-general

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Erik Jones wrote:
> On Aug 24, 2007, at 11:46 AM, Tom Lane wrote:
>
>> Jeff Amiel <becauseimjeff@yahoo.com> writes:
>>> Aug 22 18:08:24 db-1 postgres[16452]: [ID 748848
>>> local0.warning] [6-1] 2007-08-22 18:08:24 CDT   ERROR:
>>>  out of memory.
>>> Aug 22 18:08:24 db-1 postgres[16452]: [ID 748848
>>> local0.warning] [6-2] 2007-08-22 18:08:24 CDT
>>> DETAIL:  Failed on request of size 536870910.
>>
>>> What I found interesting is that It's ALWAYS the same
>>> size....536870910
>>
>>> maintenance_work_mem = 512MB            # min 1MB
>>
>> Apparently this maintenance_work_mem setting is higher than your system
>> can reliably provide.  Knock it back a bit.
>>
>>             regards, tom lane
>
> I'm not so sure.  In my case, the request size was only 256MB and we
> maintain about 10 - 11 GB free of our 16 GB of memory (2GB
> shared_buffers, 42MB work_mem, and 256 MB maintenance_work_mem).  The
> toast table that was involved in the error was pretty small and I was
> able to successfully vacuum it myself virtually instantly.  However, in
> my case, this (so far) being a one time error I don't have much more
> data to contribute.  We constantly monitor and graph our system's I/O,
> CPU, and memory usage and scan our logs for errors so if anything else
> comes up I'll be sure to share.

We are actually diagnosing a similar problem on this end, where we get a
failure at 1920... I am currently trying to get some DEBUG output.

Sincerely,

Joshua D. Drake


>
>
> Erik Jones
>
> Software Developer | Emma®
> erik@myemma.com
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