gengliangwang commented on issue #23914: [SPARK-27009] Add Standard Deviation to Benchmark tests URL: https://github.com/apache/spark/pull/23914#issuecomment-468126093 I think it is good to show the standard deviation of benchmark results. In such case, should we update all the test benchmark results? ``` $ find . -name *Benchmark-results.txt ./core/benchmarks/XORShiftRandomBenchmark-results.txt ./core/benchmarks/KryoSerializerBenchmark-results.txt ./core/benchmarks/KryoBenchmark-results.txt ./mllib/benchmarks/UDTSerializationBenchmark-results.txt ./external/avro/benchmarks/AvroReadBenchmark-results.txt ./external/avro/benchmarks/AvroWriteBenchmark-results.txt ./sql/core/benchmarks/MiscBenchmark-results.txt ./sql/core/benchmarks/ExternalAppendOnlyUnsafeRowArrayBenchmark-results.txt ./sql/core/benchmarks/JoinBenchmark-results.txt ./sql/core/benchmarks/WideSchemaBenchmark-results.txt ./sql/core/benchmarks/BloomFilterBenchmark-results.txt ./sql/core/benchmarks/InExpressionBenchmark-results.txt ./sql/core/benchmarks/CompressionSchemeBenchmark-results.txt ./sql/core/benchmarks/SortBenchmark-results.txt ./sql/core/benchmarks/DateTimeBenchmark-results.txt ./sql/core/benchmarks/UnsafeArrayDataBenchmark-results.txt ./sql/core/benchmarks/RangeBenchmark-results.txt ./sql/core/benchmarks/DatasetBenchmark-results.txt ./sql/core/benchmarks/BuiltInDataSourceWriteBenchmark-results.txt ./sql/core/benchmarks/DataSourceReadBenchmark-results.txt ./sql/core/benchmarks/CSVBenchmark-results.txt ./sql/core/benchmarks/PrimitiveArrayBenchmark-results.txt ./sql/core/benchmarks/HashedRelationMetricsBenchmark-results.txt ./sql/core/benchmarks/WideTableBenchmark-results.txt ./sql/core/benchmarks/AggregateBenchmark-results.txt ./sql/core/benchmarks/ColumnarBatchBenchmark-results.txt ./sql/core/benchmarks/JSONBenchmark-results.txt ./sql/core/benchmarks/FilterPushdownBenchmark-results.txt ./sql/catalyst/benchmarks/HashByteArrayBenchmark-results.txt ./sql/catalyst/benchmarks/HashBenchmark-results.txt ./sql/catalyst/benchmarks/UnsafeProjectionBenchmark-results.txt ./sql/hive/benchmarks/ObjectHashAggregateExecBenchmark-results.txt ./sql/hive/benchmarks/OrcReadBenchmark-results.txt ```
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