Yapt (yet another performance test) is a benchmark recommended by a pair of drive manufacturers and was incredibly difficult to locate as it hasn't been updated or used in quite some time. That doesn't make it irrelevant by any means though, as the benchmark is quite useful. It creates a test file of about 100 MB in size and runs both random and sequential read and write tests with it while changing the data I/O size in the process. The results are a good look at overall drive performance.
The MX100 has a harder time with YAPT, mainly because this benchmark does not perform 4k aligned access, so the reduced flash bandwidth adds in some additional latency during certain workloads for this particular bench. Good as a data point, but not the same type of real world effect you'd see under any modern (4k aligned) file system.