Github user kiszk commented on the issue:
https://github.com/apache/spark/pull/19518
I created and ran another synthetic benchmark program for comparing flat
global variables, inner global variables, and array. In summary, the
followings are performance results (**small number is better**).
- 0.65: flat global variables
- 0.91: inner global variables
- 1: array
WDYT? Any comments are very appreciated.
Here are
[Test.java](https://gist.github.com/kiszk/63c2829488cb777d7ca78d45d20c021f) and
[myInsntance.py](https://gist.github.com/kiszk/049a62f5d1259481c400a86299bd0228)
that I used.
```
$ cat /proc/cpuinfo | grep "model name" | uniq
model name : Intel(R) Xeon(R) CPU E5-2667 v3 @ 3.20GHz
$ java -version
openjdk version "1.8.0_131"
OpenJDK Runtime Environment (build 1.8.0_131-8u131-b11-2ubuntu1.16.04.3-b11)
OpenJDK 64-Bit Server VM (build 25.131-b11, mixed mode)
$ python myInstance.py > MyInstance.java && javac Test.java && java Test
Result(us): Array
0: 462848.969
1: 461978.693
2: 463174.459
3: 461422.763
4: 460563.915
5: 460112.262
6: 460059.957
7: 460376.230
8: 460245.445
9: 460308.775
10: 460154.955
11: 460005.629
12: 460330.584
13: 460277.612
14: 460181.360
15: 460168.843
16: 459790.137
17: 460248.481
18: 460344.471
19: 460084.529
20: 459987.263
21: 459961.639
22: 459952.447
23: 460128.518
24: 460025.783
25: 459874.303
26: 459932.685
27: 460065.736
28: 459954.526
29: 459972.679
BEST: 459790.137000, AVG: 460417.788
Result(us): InnerVars
0: 421013.480
1: 420279.235
2: 419366.157
3: 421015.934
4: 419540.049
5: 420316.650
6: 419816.612
7: 420211.140
8: 420215.864
9: 421104.657
10: 421836.430
11: 420866.894
12: 421457.850
13: 421734.506
14: 420796.010
15: 419832.910
16: 420012.167
17: 420821.800
18: 420962.178
19: 421981.676
20: 421721.257
21: 419996.594
22: 419742.884
23: 420158.066
24: 420156.773
25: 420325.231
26: 420966.914
27: 420787.147
28: 420296.789
29: 420520.843
BEST: 419366.157, AVG: 420595.157
Result(us): Vars
0: 343490.797
1: 342849.079
2: 341990.967
3: 342844.044
4: 343484.681
5: 342586.419
6: 342468.883
7: 343113.300
8: 343516.875
9: 343002.395
10: 341499.538
11: 342192.102
12: 341847.383
13: 342533.215
14: 341376.556
15: 342018.111
16: 341316.445
17: 342043.378
18: 341969.932
19: 343415.854
20: 343103.133
21: 342084.686
22: 341555.293
23: 342984.355
24: 342302.336
25: 341994.372
26: 342475.639
27: 342281.214
28: 342205.175
29: 342462.032
BEST: 341316.445, AVG: 342433.606
```
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