In a MPI program with 16 processes what is the largest rank

Solution

MPI stands for Message Passing Interface which primarily addresses the message-passing parallel programming model that is data is moved from the address space of one process to that of another process through cooperative operations on each process.In a MPI program, every process has its own unique, integer identifier assigned by the system when the process initializes. A rank is sometimes also called a \"task ID\". Ranks begin at zero.Initially, each process will be assigned a unique integer rank between 0 and number of tasks - 1 within the communicator.So, for 16 processes the largest rank any process can have is 15 i.e.(16-1) and the smallest rank will be zero i.e. 0.