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From: =?iso-8859-1?q?Mart=EDn=20Marqu=E9s?= <martin@bugs.unl.edu.ar>
To: Robert Love <rml@tech9.net>
Subject: Re: howto see shmem
Date: Wed, 24 Oct 2001 20:39:57 -0300
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Cc: Marc Brekoo <kernel@brekoo.no-ip.com>, linux-kernel@vger.kernel.org
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On Mi? 24 Oct 2001 20:37, Robert Love wrote:
> On Wed, 2001-10-24 at 19:27, Mart?n Marqu?s wrote:
> > [...]
> > ------ Shared Memory Segments --------
> > key       shmid     owner     perms     bytes     nattch    status
> > 0x00000000 65536     nobody    600       46084     11        dest
> > [...]
> > I can see 46084 bytes in shared memory used by the apache.
> > Am I wrong?
>
> Nope.  Applications know how much the are sharing because they can
> easily see what region of memory is shared/mapped into their's.
>
> The reason the kernel can't figure out the net shared memory is because
> there is no simple way -- it has to add up the shared regions of all
> applications, counting each shared segment only once.  Too much work.

Yes, I guess you are right. I just checked on and old RH server with a 2.2.x 
kernel, and the sum of the shared memory of each application doesn't give me 
the amount of shared memory that free gives me.

Thanks to all!

-- 
Porqu? usar una base de datos relacional cualquiera,
si pod?s usar PostgreSQL?
-----------------------------------------------------------------
Mart?n Marqu?s                  |        mmarques@unl.edu.ar
Programador, Administrador, DBA |       Centro de Telematica
                       Universidad Nacional
                            del Litoral
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