MPI error with matrix: segmentation fault - c

Question

A program was written to find the minimum value in the matrix. At small values of the matrix dimension, it works correctly, however, if the dimension exceeds 350x350, then when calculating on a different number of nodes, a similar error occurs.
mpirun noticed that process rank 4 with PID 15014 on node cluster exited on signal 11 (Segmentation fault).
Everything works on two cores, but not always on others.
I use the following commands:
mpicc Lab777.c -o 1 -lm -std=c99
mpirun -np 16 ./1
The code:
#include "mpi.h"
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#define ROWS 350
#define COLS 350
#define max 999999999
void rand_matrix(int array[ROWS][COLS])
{
srand((unsigned int)time(NULL));
for (int i = 0; i < ROWS; i++)
for (int j = 0; j < COLS; j++)
array[i][j] = rand();
}
void show(int array[ROWS][COLS])
{
for (int i = 0; i < ROWS; i++)
{
printf("\n");
for (int j = 0; j < COLS; j++)
{
printf("\t|%d|", array[i][j]);
}
printf("\n");
}
}
void convert(int array[ROWS][COLS], int *conv_arr)
{
int k = 0;
for (int i = 0; i < ROWS; i++)
for (int j = 0; j < COLS; j++)
{
conv_arr[k] = array[i][j];
k++;
}
}
int find_min(int *array, int piece, int num_of_pieces)
{
int result = max;
for (int i = 0; i < (ROWS * COLS / (num_of_pieces)); i++)
if (array[i] < result)
result = array[i];
return result;
}
int main(int argc, char *argv[])
{
int matrix[ROWS][COLS], lin_arr[ROWS * COLS], min;
double startwtime, endwtime;
int ProcNum;
int ProcRank;
MPI_Init(&argc, &argv);
MPI_Comm_size(MPI_COMM_WORLD, &ProcNum);
MPI_Comm_rank(MPI_COMM_WORLD, &ProcRank);
int recv_matrix[ProcNum][ROWS * COLS], func[ProcNum];
if (ProcRank == 0)
{
printf("Matrix is filling\n");
rand_matrix(matrix);
convert(matrix, lin_arr);
printf("Matrix:\n");
//show(matrix);
}
startwtime = MPI_Wtime();
MPI_Scatter(&lin_arr[(ProcRank) * (ROWS * COLS / (ProcNum))], (ROWS * COLS / (ProcNum)), MPI_INT, &recv_matrix[ProcRank],(ROWS * COLS / (ProcNum)), MPI_INT, 0, MPI_COMM_WORLD);
func[ProcRank] = find_min(recv_matrix[ProcRank], ProcRank, ProcNum);
MPI_Reduce(&func[ProcRank], &min, 1, MPI_INT, MPI_MIN, 0, MPI_COMM_WORLD);
endwtime = MPI_Wtime();
if (ProcRank == 0)
{
printf("Min value: %d\n", min);
printf("Time: %.4f\n", endwtime-startwtime);
}
MPI_Finalize();
return 0;
}
UPD:
Trying to reduce memory for recv_matrix and func.
I added the following line :
#define MAXPROC 20
And changed the following:
int recv_matrix[MAXPROC][ROWS * COLS], func[MAXPROC];
But now it works with a smaller matrix size