Re: [Dev-C++] Memory allocation

[Per W. <pw...@ia...>]

Half a million entries of int is 2MB.

The fist alternative isn't static - it isn't a global variable - but is
auto, i.e. stored on the stack. The stack isn't infinite, and should not
be used for huge allocations.

Because of the limitations in a 32-bit environment - max 4GB address space
- most OS limits the max stack size to a couple of MB, and try to keep as
large part of the address space available for dynamic allocation,
memory-mapped files, interprocess communication etc.

/Per W

On Sun, 21 Sep 2003, Alessandro Bugatti wrote:

> Why when I try to run the following program
>
> int main()
> {
>     int a[1000000];
>     system("PAUSE");
>     return 0;
> }
>
> I have a fatal error during execution (it seems to happen when the array is over 500000)
> while the following program
>
> int main()
> {
>     int *a;
>     a=(int *)malloc(1000000);
>     system("PAUSE");
>     return 0;
> }
>
> works fine?
> In the first there is static allocation and in the second I use dynamic allocation, but the result should be the same (or not?)
> Thanks.
> Alessandro