[Numpy-discussion] 2 GB limit for memmap'ed files

Sebastian Haase haase at msg.ucsf.edu
Thu Sep 7 15:25:04 CDT 2006


Hi Glen !
How is that quote really !?

The new Python2.5 *is* implementing the needed changes - so go ahead install 
Python2.5 (rc1 is the latest I think) and report how it works.

I would also be very intersted to hear ;-)

-Sebastian Haase



On Thursday 07 September 2006 12:34, Glen W. Mabey wrote:
> A long time ago, Travis wrote:
> >  On a related, but orthogonal note:
> >
> >  My understanding is that using memory-mapped files for *very* large
> >  files will require modification to the mmap module in Python ---
> >  something I think we should push.  One part of that process would be
> >  to add the C-struct array interface to the mmap module and the buffer
> >  object -- perhaps this is how we get the array interface into Python
> >  quickly.   Then, if we could make a base-type mmap that did not use
> >  the buffer interface or the sequence interface (similar to the
> >  bigndarray in scipy_core) and therefore by-passed the problems with
> >  Python in those areas, then the current mmap object could inherit from
> >  the base class and provide current functionality while still exposing
> >  the array interface for access to >2GB files on 64-bit systems.
> >
> >  Who would like to take up the ball for modifying mmap in Python in
> >  this fashion?
> >
> >  -Travis
>
> Did anyone ever "pick up the ball" on this issue?
>
> Glen
>
>
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