RFR: 8334342: Add MergeStore JMH benchmarks [v7]

[Emanuel Peter]

On Wed, 24 Jul 2024 21:59:52 GMT, Shaojin Wen <duke at openjdk.org> wrote:

>> Shaojin Wen has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 16 additional commits since the last revision:
>> 
>>  - Merge remote-tracking branch 'upstream/master' into merge_store_bench
>>  - move to vm.compiler
>>  - Merge remote-tracking branch 'upstream/master' into merge_store_bench
>>  - Merge remote-tracking branch 'upstream/master' into merge_store_bench
>>  - bug fix for `putChars4C`
>>  - bug fix for `putChars4C` and `putChars4S`
>>  - use VarHandler CHAR_L & CHAR_B
>>  - copyright
>>  - bug fix for putIntBU
>>  - add cases for `getChar` & `putChar`
>>  - ... and 6 more: https://git.openjdk.org/jdk/compare/19a79110...d00654ff
>
> Here are the performance numbers running on the new MacBook M1 Pro,
> 
> * Test scenarios with significant performance improvements
> 
> Benchmark                    Mode  Cnt  Score-Old    Score-New    Units
> MergeStoreBench.putChars4BU  avgt   15  10266.123    3830.198 *   ns/op
> MergeStoreBench.putChars4LU  avgt   15  10266.238    3827.784 *   ns/op
> MergeStoreBench.setIntLU     avgt   15   5103.562    2573.624 *   ns/op
> MergeStoreBench.setLongLU    avgt   15  10304.012    2921.575 *   ns/op
> MergeStoreBench.setLongRLU   avgt   15  10263.975    3241.057 *   ns/op
> 
> 
> * 
> 
> Benchmark                    Mode  Cnt  Score-Old    Score-New    Units
> MergeStoreBench.getCharB     avgt   15   5341.787    5340.200     ns/op
> MergeStoreBench.getCharBU    avgt   15   5477.363    5482.163     ns/op
> MergeStoreBench.getCharBV    avgt   15   5163.099    5074.165     ns/op
> MergeStoreBench.getCharC     avgt   15   5068.708    5051.763     ns/op
> MergeStoreBench.getCharL     avgt   15   5379.821    5374.464     ns/op
> MergeStoreBench.getCharLU    avgt   15   5477.268    5487.532     ns/op
> MergeStoreBench.getCharLV    avgt   15   5079.045    5071.263     ns/op
> MergeStoreBench.getIntB      avgt   15   6276.548    6277.984     ns/op
> MergeStoreBench.getIntBU     avgt   15   5229.813    5232.984     ns/op
> MergeStoreBench.getIntBV     avgt   15   1207.868    1206.264     ns/op
> MergeStoreBench.getIntL      avgt   15   6182.150    6172.779     ns/op
> MergeStoreBench.getIntLU     avgt   15   5164.260    5157.317     ns/op
> MergeStoreBench.getIntLV     avgt   15   2555.443    2558.110     ns/op
> MergeStoreBench.getIntRB     avgt   15   6879.188    6889.916     ns/op
> MergeStoreBench.getIntRBU    avgt   15   5771.857    5769.950     ns/op
> MergeStoreBench.getIntRL     avgt   15   6625.754    6625.605     ns/op
> MergeStoreBench.getIntRLU    avgt   15   5746.554    5746.742     ns/op
> MergeStoreBench.getIntRU     avgt   15   2547.449    2544.586     ns/op
> MergeStoreBench.getIntU      avgt   15   2543.552    2541.119     ns/op
> MergeStoreBench.getLongB     avgt   15  12099.002   12098.129     ns/op
> MergeStoreBench.getLongBU    avgt   15   9771.893    9760.621     ns/op
> MergeStoreBench.getLongBV    avgt   15   2593.835    2593.635     ns/op
> MergeStoreBench.getLongL     avgt   15  12045.235   12031.065     ns/op
> MergeStoreBench.getLongLU    avgt   15   9659.585    9653.938     ns/op
> MergeStoreBench.getLongLV    avgt   15   2561.089    2557.521     ns/op
> MergeStoreBench.getLongRB    avgt   15  12095.060   12092.061...

@wenshao generally we like to have at least 2 reviews before integration ;)

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PR Comment: https://git.openjdk.org/jdk/pull/19734#issuecomment-2249791741