Michael Han created HDFS-12277:

             Summary: NNThroughputBenchmark should use cumulativeTime to 
calculate ops per second.
                 Key: HDFS-12277
                 URL: https://issues.apache.org/jira/browse/HDFS-12277
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: benchmarks, tools
            Reporter: Michael Han
            Assignee: Michael Han
            Priority: Minor

{{NNThroughputBenchmark$getOpsPerSecond}} is using {{elapsedTime}} to calculate 
ops per second. {{elapsedTime}} is the time used to measure the time from the 
start to the finish of the benchmark main thread, and it's also the total 
execution time of the single slowest benchmark worker thread. To measure ops 
per second, we should use the total execution time of all worker threads, which 
is {{cumulativeTime}}. Otherwise, we could get bogus result, e.g. given same 
load, the more client threads we have (controlled by {{-threads}}), the larger 
ops per second the number would be, with the same NN and its server side 

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