68189f7e1b
Summary: After closely working with Mark, Siying, and Yueh-Hsuan this set of changes reflects the updates needed to measure RocksDB subcompaction performance in a correct manner. The essence of the benchmark is executing `fillrandom` followed by `compact` with the correct set of options for various number of subcompactions specified. Test Plan: Tested internally to verify correctness and reliability. Reviewers: sdong, yhchiang, MarkCallaghan Reviewed By: MarkCallaghan Subscribers: dhruba Differential Revision: https://reviews.facebook.net/D55089