Once you have configured bgperf, you will be able to benchmark the BGP implementations.
For example:
$ sudo python3 bgperf.py bench run tester tester booting.. (100/100) run gobgp elapsed: 16sec, cpu: 0.20%, mem: 580.90MB elapsed time: 11sec
The execution stops only when 100 BGP peers are successfully booted. Further benchmarks can be executed by following the project page.