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.