RFR: 8333396: Performance regression of DecimalFormat.format [v3]

[lingjun-cg]

On Tue, 4 Jun 2024 07:54:56 GMT, kuaiwei <duke at openjdk.org> wrote:

> > > Hi, I think you can add the jmh test case.
> > 
> > 
> > [#19513 (comment)](https://github.com/openjdk/jdk/pull/19513#issue-2330131051) already contains the test case.
> 
> I mean it can be added as a test case in test/micro and be evaluated in future build.

Thanks for your remainder. There exist a JMH  test case which named  'test/micro/org/openjdk/bench/java/text/DefFormatterBench.java'.

This JMH test case run in throughput mode.
If  run without the patch, the output is:

Benchmark                                  Mode  Cnt     Score    Error   Units
DefFormatterBench.testDefNumberFormatter  thrpt    5  1842.666 ? 83.694  ops/ms


If run with after apply the patch, the output is:

Benchmark                                  Mode  Cnt     Score     Error   Units
DefFormatterBench.testDefNumberFormatter  thrpt    5  3988.274 ? 513.434  ops/ms


The score is increased by  (3988.274-1842.666)/1842.666 = 116%.

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PR Comment: https://git.openjdk.org/jdk/pull/19513#issuecomment-2146983441