Neil wrote:
>What is the value of "i"?
>What is the value of "size"?
Below is the block of code where I call MPI_Isend. I guess it makes clear the values of i and j (both int):
for (i=0, j=0; i < size; i++, j++){
if(i != rank){
MPI_Isend(&sbuf[i],1,MPI_INT,i,124,MPI_COMM_WORLD,request+j);
}
else j--;
}
Process 0 goes through this for and sends all of its messages, but when another process is about to send its first message (i and j are zero), I get the segmentation fault.
size is an integer initialized with:
MPI_Comm_size(MPI_COMM_WORLD, &size);
and sbuf:
sbuf = (int *)malloc(size*sizeof(int));
I assume the problem is with request because if I do declare
MPI_Request request[64];
instead of mallocing it, the program works.
Thanks,
Leonardo.
|
