viirya commented on a change in pull request #25969: [SPARK-29297][TESTS] 
Compare `core`/`mllib` module benchmarks in JDK8/11
URL: https://github.com/apache/spark/pull/25969#discussion_r329406585
 
 

 ##########
 File path: core/benchmarks/PropertiesCloneBenchmark-jdk11-results.txt
 ##########
 @@ -6,35 +6,35 @@ OpenJDK 64-Bit Server VM 11.0.4+11-LTS on Linux 
3.10.0-862.3.2.el7.x86_64
 Intel(R) Xeon(R) CPU E5-2670 v2 @ 2.50GHz
 Empty Properties:                         Best Time(ms)   Avg Time(ms)   
Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
 
------------------------------------------------------------------------------------------------------------------------
-SerializationUtils.clone                              0              0         
  0          0.1       13755.0       1.0X
-Utils.cloneProperties                                 0              0         
  0          3.5         285.0      48.3X
+SerializationUtils.clone                              0              0         
  0          0.1       11539.0       1.0X
+Utils.cloneProperties                                 0              0         
  0          1.7         572.0      20.2X
 
 Review comment:
   oh, I meant previously 48.3X -> now 20.2X, so seems the speed up of 
Utils.cloneProperties seems less.

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