LMDB benchmark support

It seems that influxdb-comparisons lacks support for LMDB.  follow this result link from this site: https://www.influxdata.com/blog/benchmarking-leveldb-vs-rocksdb-vs-hyperleveldb-vs-lmdb-performance-for-influxdb/, and just can't figure out use what branch to do LMDB benchmarking.  Would be very thankful if guided out. Thanks!