[SciPy-user] partially reading a file...

Sebastian Haase haase@msg.ucsf....
Thu Aug 7 11:08:43 CDT 2008


On Thu, Aug 7, 2008 at 5:36 PM, fred <fredmfp@gmail.com> wrote:
> Travis E. Oliphant a écrit :
>>
>> Should work...
> I have tested the trick on a file which has 2.7 10**9 nodes, ie > 2**31
> and I get the following message:
>
> File "/usr/local/lib/python2.5/site-packages/numpy/core/memmap.py", line
> 193, in __new__
>      mm = mmap.mmap(fid.fileno(), bytes, access=acc)
>      ValueError: mmap length is greater than file size
>
> Is there a workaround to consider long integer (if this is the issue) ?
>
> TIA.
>
Are you "really" on a 64-bit system ?
Is this Linux ?
Is your Python the original from the distro - or did you build it yourself ?
Do a: >>> import sys;print sys.maxint

Did you build numpy yourself or did you download a binary ?

HTH,
Sebastian


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