MaxGekk commented on a change in pull request #27078: [SPARK-30409][SQL][TESTS] 
Use `NoOp` datasource in SQL benchmarks
URL: https://github.com/apache/spark/pull/27078#discussion_r364572908
 
 

 ##########
 File path: sql/core/benchmarks/AggregateBenchmark-results.txt
 ##########
 @@ -2,142 +2,142 @@
 aggregate without grouping
 
================================================================================================
 
-OpenJDK 64-Bit Server VM 1.8.0_222-b10 on Linux 3.10.0-862.3.2.el7.x86_64
-Intel(R) Xeon(R) CPU E5-2670 v2 @ 2.50GHz
+OpenJDK 64-Bit Server VM 1.8.0_232-8u232-b09-0ubuntu1~18.04.1-b09 on Linux 
4.15.0-1051-aws
+Intel(R) Xeon(R) Platinum 8175M CPU @ 2.50GHz
 agg w/o group:                            Best Time(ms)   Avg Time(ms)   
Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
 
------------------------------------------------------------------------------------------------------------------------
-agg w/o group wholestage off                      50499          52524        
2863         41.5          24.1       1.0X
-agg w/o group wholestage on                        1163           1205         
 56       1803.1           0.6      43.4X
+agg w/o group wholestage off                      39763          42107         
NaN         52.7          19.0       1.0X
+agg w/o group wholestage on                         967            970         
  3       2168.7           0.5      41.1X
 
 
 
================================================================================================
 stat functions
 
================================================================================================
 
-OpenJDK 64-Bit Server VM 1.8.0_222-b10 on Linux 3.10.0-862.3.2.el7.x86_64
-Intel(R) Xeon(R) CPU E5-2670 v2 @ 2.50GHz
+OpenJDK 64-Bit Server VM 1.8.0_232-8u232-b09-0ubuntu1~18.04.1-b09 on Linux 
4.15.0-1051-aws
+Intel(R) Xeon(R) Platinum 8175M CPU @ 2.50GHz
 stddev:                                   Best Time(ms)   Avg Time(ms)   
Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
 
------------------------------------------------------------------------------------------------------------------------
-stddev wholestage off                             13393          13403         
 14          7.8         127.7       1.0X
-stddev wholestage on                               1291           1315         
 25         81.2          12.3      10.4X
+stddev wholestage off                              6232           6243         
 15         16.8          59.4       1.0X
 
 Review comment:
   If we look at `Per Row(ns)`, results are comparable:
   - `stddev wholestage off ` - OpenJDK 8 = 59.4 ns, Oracle JDK 11 = 65.0 ns
   -  `stddev wholestage on` - OpenJDK 8 = 9.1 ns, Oracle JDK 11 = 9.2 ns
   
   Comparing to previous runs on OpenJDK 8 doesn't make sense due to some many 
differences - hardware, JDK version, libs, Linux kernel and so on.

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