Memory allocation overflow in c program

[Carmelo38I]

In a large system I try to allocate about 1GB of memory on a 4GB system

and it blows up (returns a NULL pointer in C), Now I tried to allocate

1GB from a small test program and it also returns null.

Also, I have implemented the /LARGEADDRESSLIMIT switch on the Linker,

to be able to address more than 2GB RAM. But the system does not want

to allocate 1GB, when the available memory is 1.8GB according to the

Task Manager!!

ex: BYTE *bb=(BYTE*) calloc(0.9, 0x40000000);
where BYTE is unsigned char

I can only allocate about 400MB, otherwise I get NULL

How much memory I can allocate from a C program ?

It looks like there is something I don’t quite understand about the x86

memory model.

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