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Thread: Shared Memory

Shared Memory

From
Chris Ruprecht
Date:
Hi all,

I have tried to give PostGres a little more shared memory but I
failed. I'm running Linux 2.4.9-13 (RedHat 7.2 + all the updates). I
currently have 2048 blocks (8K each) allocated, when I try to push
this up to 3072 or higher, I get
IpcMemoryCreate: shmget(key=5432001, size=43540480, 03600) failed:
Invalid argument
and a log story about SHMMAX - Now, I have checked where ever I can
and found, that the max is about 16 MB in an unmodified kernel. My
question: How do I increase that without the need of a kernel
re-compile?

Best regards,
Chris
--
Chris Ruprecht
Network grunt and bit pusher extraordinaíre

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Re: Shared Memory

From
Lamar Owen
Date:
On Saturday 15 December 2001 10:01 pm, Chris Ruprecht wrote:
> IpcMemoryCreate: shmget(key=5432001, size=43540480, 03600) failed:
> Invalid argument
> and a log story about SHMMAX - Now, I have checked where ever I can
> and found, that the max is about 16 MB in an unmodified kernel. My
> question: How do I increase that without the need of a kernel
> re-compile?

See the kernel sysctl docs for /proc/sys/kernel/shmmax
--
Lamar Owen
WGCR Internet Radio
1 Peter 4:11

Re: Shared Memory

From
"Nick Fankhauser"
Date:
Chris:

The quick answer is here- a little more than halfway down the page.

http://www.postgresql.org/idocs/index.php?kernel-resources.html


Regards,

-Nick

> -----Original Message-----
> From: pgsql-admin-owner@postgresql.org
> [mailto:pgsql-admin-owner@postgresql.org]On Behalf Of Chris Ruprecht
> Sent: Saturday, December 15, 2001 10:01 PM
> To: PostGreSQL Admin Group
> Subject: [ADMIN] Shared Memory
>
>
> Hi all,
>
> I have tried to give PostGres a little more shared memory but I
> failed. I'm running Linux 2.4.9-13 (RedHat 7.2 + all the updates). I
> currently have 2048 blocks (8K each) allocated, when I try to push
> this up to 3072 or higher, I get
> IpcMemoryCreate: shmget(key=5432001, size=43540480, 03600) failed:
> Invalid argument
> and a log story about SHMMAX - Now, I have checked where ever I can
> and found, that the max is about 16 MB in an unmodified kernel. My
> question: How do I increase that without the need of a kernel
> re-compile?
>
> Best regards,
> Chris
> --
> Chris Ruprecht
> Network grunt and bit pusher extraordinaíre
>  _________________________________________________________ Do You
> Yahoo!? Get your free @yahoo.com address at http://mail.yahoo.com
>
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Re: Shared Memory

From
Chris Ruprecht
Date:
Thank you guys - I have the answer and it's ticking along nicely now
with 68888 KB of shared memory (this is what 'top' reports). I have
set the parameter in the config file to 8192, now I have to monitor
if this has any impact on speed.

Best regards,
Chris
--
Chris Ruprecht
Network grunt and bit pusher extraordinaíre

_________________________________________________________
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