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Issue with SHMALL parameter
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data tanger  
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 More options Sep 18 2012, 9:59 am
Newsgroups: mailing.database.pgsql-docs
From: datatan...@hotmail.fr (data tanger)
Date: Tue, 18 Sep 2012 15:59:53 +0200
Local: Tues, Sep 18 2012 9:59 am
Subject: [DOCS] Issue with SHMALL parameter
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Hi,
I'm using postgresql 9.1 as my database server on a linux server that has 8 GB of RAM.
After I changed the shared_buffers parameter to 2GB, I get the following error when I try to start postgres:
FATAL:  could not create shared memory segment: Cannot allocate memoryDETAIL:  Failed system call was shmget(key=5432001, size=2221539328, 03600).
Here are the shmall and the shmax params of my server:
#cat /proc/sys/kernel/shmmax     68719476736
#cat /proc/sys/kernel/shmall     4294967296
So as you see, shmall is greater than the requested size by postgres. Anyone have and idea?
thank you                                        


 
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Tom Lane  
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 More options Sep 18 2012, 12:08 pm
Newsgroups: mailing.database.pgsql-docs
From: t...@sss.pgh.pa.us (Tom Lane)
Date: Tue, 18 Sep 2012 12:07:46 -0400
Local: Tues, Sep 18 2012 12:07 pm
Subject: Re: [DOCS] Issue with SHMALL parameter
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data tanger <datatan...@hotmail.fr> writes:
> Here are the shmall and the shmax params of my server:
> #cat /proc/sys/kernel/shmmax     68719476736
> #cat /proc/sys/kernel/shmall     4294967296

SHMALL is measured in pages not bytes on Linux.  I wonder if that value
is too large and is causing an internal integer overflow in the kernel.

                        regards, tom lane

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data tanger  
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 More options Sep 18 2012, 2:07 pm
Newsgroups: mailing.database.pgsql-docs
From: datatan...@hotmail.fr (data tanger)
Date: Tue, 18 Sep 2012 20:07:54 +0200
Local: Tues, Sep 18 2012 2:07 pm
Subject: Re: [DOCS] Issue with SHMALL parameter
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Thank you for your answer. I think the value of shmall I have is very common cause I've seen it many times in other servers.Do you think there maybe a link between the request size of postgres and the swap size?
Here is the output of free -m
free -m             total       used       free     shared    buffers     cachedMem:          7867       1860       6007          0          5        595-/+ buffers/cache:       1258       6609Swap:         1023          2       1021
Regards,


 
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