Hello. I need some help troubleshooting a program i wrote. For a combination of data and nodes the program runs fine, but for others not. For example i use 2d arrays for data collections and divide them into the nodes. If the number of the lines in the array are 320 and the nodes are 16 ( 8 physical nodes with multi-threading) the program runs fine. But if the lines in the array are 50 and the nodes 16 the program fails, but again if the nodes are 2 or 4 the program runs ok. Is there a way to define the exact spot where the code is failing? Also, some examples would do wonders. Thanks Ps-1: The errors that the program returns are in the form of: rank 25 in job 29 Calliope_50394 caused collective abort of all ranks - exit status of rank 25: killed by signal 11 Ps-2: I wrote other programs in MPI that worked, and the only difference is, that in this program i use loops like these: for(i=id*n/p; i< (id+1)*n/p; i++){..... (where id are the id's of the nodes, n is the data collection and p are the number of nodes) to parse the data accordingly.