You need to install google-perftool libraries. On my system: sudo apt libgoogle-perftools-dev.
This will use data in test_data/idf/ that comes from https://opendata.stif.info
cargo run --release 2017-11-28 -i test_data/idf/
google-pprof --web target/release/bench ./bench.profile
More detailed results can be obtained by running in debug:
cargo run 2017-11-28 -i test_data/idf/
google-pprof --web target/debug/bench ./bench.profile