Re: octave memory

[jean francois sauvage]

hello

I need these informations because I have to perform quite large
simulations, that may be limited by the total amount of free memory.
Basically, I want to know how much memory is used for the Cholesky
decomposition of a NxN matrix, compared to a basic inversion.

I know that the inversion of a N-elements matrix needs N^(3/2) free
space in memory. but I'm using sparse matrix, so this rule is no more
pertinent.

Jeff

On Wed, Feb 11, 2009 at 5:45 PM, John W. Eaton <address@hidden> wrote:
> On 11-Feb-2009, Søren Hauberg wrote:
>
> | ons, 11 02 2009 kl. 17:31 +0100, skrev jean francois sauvage:
> | > 2) Actually, the "who" command gives information about the size of
> | > variables. This is not exactly what I need. I need to know how much
> | > memory has been allocated while the execution of a program.
> | >
> | > the function memory() of IDL returns 4 arguments :
> | >  - the actual amount of dynamic memory used by IDL
> | >  - the number of memory allocation since last call to memory()
> | >  - the number of memory unallocation since last call to memory()
> | >  - the maximum amount of dynamic memory readched since last call to 
> memory()
> | >
> | > I am looking for something similar (particularly for the first and
> | > fourth arguments) in octave.
>
> Octave doesn't keep track of these statistics.
>
> Why do you think you need this information?
>
> jwe
>