Re: howto see shmem

[Martín Marqués]

On Mié 24 Oct 2001 20:37, Robert Love wrote:
> On Wed, 2001-10-24 at 19:27, Martín Marqués 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!

-- 
Porqué usar una base de datos relacional cualquiera,
si podés usar PostgreSQL?
-----------------------------------------------------------------
Martín Marqués                  |        [e-mail]
Programador, Administrador, DBA |       Centro de Telematica
                       Universidad Nacional
                            del Litoral
-----------------------------------------------------------------