How to add a new benchmark

We assume that the user knows how to run the benchmark with tachyon-perf. To add a new benchmark, the basic requisite is to extend tachyon.perf.basic.PerfTask and tachyon.perf.basic.TaskContext, then modify the configuration files. Optionally, you can extend tachyon.perf.basic.PerfTotalReport or implement tachyon.perf.basic.Supervisible to make more tools supported. We recommend that all your own classes in a new package tachyon.perf.benchmark.<YourTaskType>.