Memory Problems in Windows 2003 Server

brad byte8bits at
Fri Oct 12 16:26:43 CEST 2007

amdescombes wrote:
> Hi,
> I am using Python 2.5.1
> I have an application that reads a file and generates a key in a 
> dictionary for each line it reads. I have managed to read a 1GB file and 
> generate more than 8 million keys on an Windows XP machine with only 1GB 
> of memory and all works as expected. When I use the same program on a 
> Windows 2003 Server with 2GB of RAM I start getting MemoryError exceptions!
> I have tried setting the IMAGE_FILE_LARGE_ADDRESS_AWARE on both 
> Python.exe and Python25.dll and setting the /3GB flag on the boot.ini 
> file to no avail. I still get the MemoryError exceptions.
> Has anybody encountered this problem before?
> Thanks in advance for any ideas/suggestions.
> Best Regards,
> André M. Descombes

How are you reading the large files? IMO, large files are better read in 

target_file = open(f, 'rb')
while 1:
     data =
     if data:

The above reads 8MB at a time until the file has been completely read. 
Change the 8MB to whatever you like.

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