Hello. I wrote a program in MPI and for some combinations of data and number of nodes it runs ok, but other times it fails to run and returns errors (i.e. rank 0 in job 29 Calliope_50394 caused collective abort of all ranks exit status of rank 0: killed by signal 9). How i see it, for some reason, the division of data into the nodes keeps failing the execution. Because if i use 16 nodes and use for example a 320-line array as data collection, it executes fine. But if i use a 50-line array it fails the execution. Is there a way to troubleshoot the code and find where it fails? Also some examples would be great. PS. Because i have wrote other programs in MPI that worked, the only difference they have with this one, that keeps failing, is that in this one i use loops like this: for(i=id*(n/p); i< (id+1)*n/p; i++){..... to parse the data accordingly, but again for some combinations of data and number of nodes it worked...