68479cc944
These settings: 1. are already exposed via config file 2. were not exposed as command-line options, and 3. are things I wanted on the command line while benchmarking recently. I didn't include short options for --(get|put|delete)-concurrency since I couldn't think of good single-letter ones, and optparse won't take "-gc", "-pc", or "-dc". Change-Id: I0bd7c7ae2892244eed37b8c10c9357dc7e1190d3