maximum array size?

[Brian Budge]

Is this running in Linux?  Linux usually behaves optimistically,
actually returning a valid pointer from malloc, even when there is not
enough memory left in the system to satisfy the request.  A good
explanation can be found here:
http://linuxdevcenter.com/pub/a/linux/2006/11/30/linux-out-of-memory.html

On Thu, Apr 15, 2010 at 1:26 AM, Anna Sidera <sidera.anan@ucy.ac.cy> wrote:
> Hello,
>
> I wrote a program in gcc. I compile it with the option -m64. Is there a limit in how much memory malloc can allocate? I run the program for different values of some input parameters. The program defines some scalar variables and arrays. Then it defines a large array and tries to set a value in an element of the array.
> int **bufferc = malloc((inp_par_a*inp_par_b+2)*sizeof(int *));
> int *bufferc_aux = malloc((inp_par_a*inp_par_b+2)*(inp_par_c+1)*sizeof(int));
> int bfc=1;
> bufferc[bfc]=bufferc_aux+bfc*(inp_par_c+1);
> bufferc[bfc][0]=0;
> At this point sometimes there is no problem but sometimes I get segmentation fault. There is a lot of unused ram in the server when the problem occurs. Do you think the problem is due to a bug that I have before defining the array?
>
> Thanks,
> Anna
>