using mmap on large (> 2 Gig) files

myeates at jpl.nasa.gov myeates at jpl.nasa.gov
Tue Oct 24 03:10:31 CEST 2006


Well, compiling Python 2.5 on Solaris 10 on an x86 is no walk in the
park. pyconfig.h seems to think SIZEOF_LONG is 4 and I SEGV during my
build, even after modifying the Makefile and pyconfig.h.

Mathew

Martin v. Löwis wrote:
> myeates at jpl.nasa.gov schrieb:
> > Anyone ever done this? It looks like Python2.4 won't take a length arg
> >> 2 Gig since its not seen as an int.
>
> What architecture are you on? On a 32-bit architecture, it's likely
> impossible to map in 2GiB, anyway (since it likely won't fit into the
> available address space).
>
> On a 64-bit architecture, this is a known limitation of Python 2.4:
> you can't have containers with more than 2Gi items. This limitation
> was removed in Python 2.5, so I recommend to upgrade. Notice that
> the code has seen little testing, due to lack of proper hardware,
> so I shall suggest that you review the mmap code first before using
> it (or just test it out and report bugs as you find them).
> 
> Regards,
> Martin




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