[NEST Users] Get MPI time

Dear all, I used 10 PyNQ nodes to run SNN using mpirun, which is faster than a single node. but I want to know how long each node takes to start MPI and wait for MPI_all_gether to end. Where do I need to print the time in the source code?Or what tools can I use to test MPI communication times?（my nest version is 2.14） Best regards Cong