zjf2012 commented on issue #23560: [SPARK-26632][Core] Separate Thread Configurations of Driver and Executor URL: https://github.com/apache/spark/pull/23560#issuecomment-471834412 @attilapiros , We tuned a lot to get optimized result with 8 threads on old code. For your case, I just ran the SparkBenchmarkHPC again and got below result. The overall time is 235 compared to 196 with 8 threads. { "experiment" : { "id" : "simplemap-spark-scala" }, "args" : { "src" : "", "dst" : "", "cores" : "256", "generate" : "true", "lazy" : "false", "blocks" : "131072", "block_size" : "1", "multiplier" : "1048576", "block_size_unit" : "MB", "nparts" : "1", "size" : "1", "nodes" : "256", "json" : "nlog256-131072-256m_16.json", "xml" : "", "functional" : "false", "hybrid" : "false", "imperative" : "false" }, "performance" : { "map" : "45.63785444", "shift" : "77.308619541", "reduce" : "42.042015014", "average" : "70.184881466", "overall" : "235.173370461" } }
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