64bit Address

64bit Address

percoction's picture
percoction
Mon, 05/09/2011 - 07:06

I've been testing my code on the acano01 node since the documentation says it is suitable for testing purposes. The program starts off allocating memory to 32bit addresses in the heap, but before long it allocates to a 64bit address. When it tries to access that address to store a value, I get the segmentation fault. Does anyone who is more familiar with 64bit programming ever run into a problem like this? I don't get the segmentation fault when testing on my 32bit machines. Thanks!

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duncanhopkins's picture
duncanhopkins
Mon, 05/09/2011 - 08:20

Making some educated guesses,

I use 64-bit linux all the time and it will randomly (sudo-randomly ;D ) return 8 and 16 byte address.
So you cannot assume only 8 byte address.

Are you casting your address to an int or some other non-pointer data structure anywhere?
Storging a pointer in a Win32 user data holder always used to catch me out, as they asre all ints.

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max001's picture
max001
Mon, 05/09/2011 - 11:00

Another guess: If you use VC++ make sure you have /MACHINE:X64 switch. Otherwise you obviously won't be able to allocate more than 2 GB. :)

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