The dynamic topology of a mobile ad hoc network (MANET) distinguishes it as a decentralized kind of wireless network. When it comes to performance, a routing protocol is crucial. It is employed to ascertain and to find route that is both accurate and effective between two source and destination nodes to ensure that messages are delivered on time. We have examined the OLSR (Optimized Link State Routing) protocol in this research. Multi-point relays (MPRs), which are chosen nodes that forward broadcast messages throughout the flooding process, are the main idea employed in the protocol. MPRs are used to reduce routing cost by limiting the spread of control messages across the network. Many efforts have been made in the last few years to choose MPRs efficiently, which leads to improved routing performance. We provide a state-of-the-art assessment of the various MPR selection processes used in recent years in this work.