Re: error: memory exhausted or requested size too large for range of Octave's index type --

[Martin Helm]

Am Mittwoch, 16. März 2011, 14:33:25 schrieb William Krekeler:
> -----Original Message-----
> I have 12 GB memory in a 64 bit windows 7 OS, Octave binary build 3.2.4. I
> can confirm that you can not build a matrix that large in Windows.
> 
> x = zeros( 25000,25000,'double');
>       error: memory exhausted or requested size too large for range of 
> Octave's
> index type -- trying to return to prompt
> 
> Largest successful array is interestingly only 13000x13000
> 
> Attr Name        Size                     Bytes  Class
>  ==== ====        ====                     =====  =====
>       x       13000x13000             1352000000  double
> 
> This has something to do with how Octave (or programs in general)
> interfaces with Windows memory management. I know that newer versions, I'm
> using win7, pre-allocate memory and 'lock' it out even though it
> technically isn't in use. The 'lock' preloads commonly used programs to
> allow for faster access. The memory is not truly locked because (while
> running similar background programs) I can create at least a 48000x45000
> double variable in that other program (ML) on the same machine.
> 
> Bill Krekeler

Thank you for that information, it is good to know. Is there any chance for 
you to check if octave 3.4 behaves the same on a 64 bit windows as your 3.2.4 
did or if 3.4 is able to handle that large matrices like it does on linux?
(Not sure if 3.4 is available for windows?)