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Re: Shared memory error using initdb on Solaris 8

From: jseymour(at)LinxNet(dot)com (Jim Seymour)
To: pgsql-admin(at)postgresql(dot)org
Subject: Re: Shared memory error using initdb on Solaris 8
Date: 2004-05-21 15:57:15
Message-ID: 20040521155715.E15B0430E@jimsun.LinxNet.com (view raw or flat)
Thread:
Lists: pgsql-admin
> 
> Hello,
>     I'm trying to install PostgreSQL 7.4.2 on a brand new SunFire 120 with
> 2GB of RAM but when I run initdb -D /usr/local/pgsql/data I get the
> following error:
> 
[snip]
> creating template1 database in /usr/local/pgsql/data/base/1... FATAL:  could
> not create shared memory segment: Invalid argument
> DETAIL:  Failed system call was shmget(key=1, size=1081344, 03600).
> HINT:  This error usually means that PostgreSQL's request for a shared
> memory segment exceeded your kernel's SHMMAX parameter.
[snip]
> 
> When I run ulimit -a I get
> 
[snip]

You're looking at the wrong thing.  You need to do:

    sysdef |egrep -i 'shm|sem'

> 
> There does not seem to be an option in initdb to reduce the shared buffers
> size.

It tries to reduce things as far as it "sanely" can to fit within
what's available.  You can hand-tweak initdb to over-ride its
limits, but you'd end-up with a sub-optimal installation.

>        Plus, with 2GB of RAM I don't know that I'd want to go below the
> "lowest common denominator" that Postgres defaults to.

Nope.  You need to adjust certain values by placing settings in
/etc/system and rebooting.  I use:

    /etc/system
        set shmsys:shminfo_shmmax=0x2000000  (33554432 decimal)
        set shmsys:shminfo_shmmin=1
        set shmsys:shminfo_shmmni=256
        set shmsys:shminfo_shmseg=256
         
        set semsys:seminfo_semmap=256
        set semsys:seminfo_semmni=512
        set semsys:seminfo_semmns=512
        set semsys:seminfo_semmsl=32

I arrived at the above values from Google'ing.

Jim

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Subject: Re: Shared memory error using initdb on Solaris 8
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Subject: Shared memory error using initdb on Solaris 8

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