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shared memory problem

From
Date:
HI all!

I did this:

/usr/local/pgsql/bin/postmaster -B 1000 -o "-S 2000" -S -D
/usr/local/pgsql/data

and it says:
IpcMemoryCreate: shmget failed (Invalid argument) key=5432001,
size=8899584,permission=600
This type of erro is usually caused by an improper shared memory or System V
IPC semaphore configuration. Form more information....

what should I do, I am running a 600Mhz Celeron with 512RAM, I have tried the
same command in others machines and works fine,
thank you for your help,
Rocael.

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Re: shared memory problem

From
Tom Lane
Date:
<rocael@usa.net> writes:
> /usr/local/pgsql/bin/postmaster -B 1000 -o "-S 2000" -S -D
> /usr/local/pgsql/data

> and it says:
> IpcMemoryCreate: shmget failed (Invalid argument) key=5432001,
> size=8899584,permission=600
> This type of erro is usually caused by an improper shared memory or System V
> IPC semaphore configuration. Form more information....

Most likely your kernel isn't set to allow shared memory blocks as
large as 8M.
        regards, tom lane

Re: shared memory problem

From
Michael Teter
Date:
I'm not sure if this is related, and unfortunately I
don't have the specific error in front of me, but on
occasion when I restart postgresql, using

$ /etc/rc.d/init.d/postgresql restart

I'll see the shutdown message, then I'll see a shared
memory creation error, which I think looked similar to
the one below.

In the past I would just boot the box, and postgresql
naturally would start up just fine.  But last time it
happened I waited a minute, then attempted the restart
again (which obviously would just do a start, as
postgresql wasn't running because of previous
failure.)  It started up fine that time.

Perhaps there's some issue with the shared memory not
being freed quickly enough by the kernel?

michael

--- Tom Lane <tgl@sss.pgh.pa.us> wrote:
> <rocael@usa.net> writes:
> > /usr/local/pgsql/bin/postmaster -B 1000 -o "-S
> 2000" -S -D
> > /usr/local/pgsql/data
> 
> > and it says:
> > IpcMemoryCreate: shmget failed (Invalid argument)
> key=5432001,
> > size=8899584,permission=600
> > This type of erro is usually caused by an improper
> shared memory or System V
> > IPC semaphore configuration. Form more
> information....
> 
> Most likely your kernel isn't set to allow shared
> memory blocks as
> large as 8M.
> 
>             regards, tom lane


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Re: shared memory problem

From
Tom Lane
Date:
Michael Teter <michael_teter@yahoo.com> writes:
> Perhaps there's some issue with the shared memory not
> being freed quickly enough by the kernel?

Never heard of that before.  There is an issue with time delays
on release of port addresses ---  sometimes you may get a failure
to bind() to a port address that was just released by a previous
incarnation of the postmaster.  But I haven't heard of such a
thing for shared memory or semaphores.
        regards, tom lane