RFR: 8332457: Examine startup overheads from JDK-8294961 [v19]

[Adam Sotona]

On Wed, 5 Jun 2024 12:00:25 GMT, Adam Sotona <asotona at openjdk.org> wrote:

>> [JDK-8294961](https://bugs.openjdk.org/browse/JDK-8294961) changed to use classfile API for reflection proxy-generation. Actual implementation of `ProxyGenerator` is focused on performance, however it causes JDK bootstrap regressions. `ProxyGenerator.TEMPLATE` class model is statically created and each proxy class is transformed from the template.
>> 
>> This patch is intended to examine plain proxy generation impact on performance and JDK bootstrap (vs proxy transformation from template).
>> 
>> The generated proxy is migrated from static initialization to CONDY bootstrap.
>> 
>> Please review.
>> 
>> Thank you,
>> Adam
>
> Adam Sotona has updated the pull request incrementally with one additional commit since the last revision:
> 
>   An assortment of potential improvements
>   
>   Co-authored-by: Claes Redestad <redestad at openjdk.org>

Name             Cnt          Base         Error           Test         Error         Unit  Change
Perfstartup-JMH   20        40.000 ±       0.000         40.000 ±       0.000        ms/op   1.00x (p = 0.000 )
  :.cycles           236365197.300 ± 3630668.331  224263724.700 ± 4160144.635       cycles   0.95x (p = 0.000*)
  :.instructions     602001346.250 ± 3134647.039  574894340.900 ± 2297441.310 instructions   0.95x (p = 0.000*)
  :.taskclock               60.000 ±       0.000         58.500 ±       3.181           ms   0.98x (p = 0.083 )
  * = significant

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PR Comment: https://git.openjdk.org/jdk/pull/19410#issuecomment-2149681885