Sementation fault - memory problem?

[felipebil]

Im with a problem to run a C program, maybe you help me to find the solution.
Its a simple code, but uses a lot of memory. One matrix for example have 10 million elements. The program runs normally when i reduce the size of some of that matrices, but in the wanted size doesnt work. As it run sometimes, i think the problem is memory.
I have used:

% ulimit -s unlimited

and it appears to help a little, but didnt solve the problem. Had also tried to use malloc and free to free some memory, but had no effect. I know that much bigger programs run in this computer, so i really need help because i dont know what to do.

below the variables declaration:

#define T_MIN 5000
#define T_MAX 15000
#define E_MIN 0.0
#define E_MAX 0.1
#define E_NUM 100
#define N_MAPS 1000

int main(void){

int tempo, map, e, i, start, end;
int y_maxtab[N_MAPS][T_MAX/100], k[N_MAPS], n_ymax[N_MAPS];
double eps, coup, step = (double)(E_MAX-E_MIN)/(double)(E_NUM-1);
double mean, new_x;
double alfa[N_MAPS], x0[N_MAPS], y0[N_MAPS];
double x_dat[N_MAPS], y_dat[N_MAPS][T_MAX];
double rnmed_tab[2][E_NUM], rn_tab[T_MAX];
double mcos, msin, fi,deno;

the y_dat matrix is the biggest here.

p.s.: normally i use icc to compile my programs, but in gcc i get the same errors. i had also tried to use gdb, but didnt discover nothing.

[mahlerfive]

When you say you tried to use malloc and free, how did you define your 2D arrays? You need to make them like the following:

double** y_dat = (double**) malloc( sizeof(double*) * N_MAPS );
for( i = 0; i < N_MAPS; i++ ) {
    y_dat[i] = (double*) malloc( sizeof(double) * T_MAX );
}

Using malloc will allocate memory on the heap. The way you are doing it now is allocating memory on the stack which is very limited.