RFR: 8310502 : optimization for UUID#toString [v3]

[温绍锦]

On Wed, 21 Jun 2023 13:32:32 GMT, 温绍锦 <duke at openjdk.org> wrote:

>> 温绍锦 has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   8310502 : hex literal
>
> * benchmark code
> https://github.com/wenshao/jdk_8310502_test/blob/main/src/main/java/com/alibaba/openjdk/UUIDUtilsBenchmark.java
> 
> 
> git clone https://github.com/wenshao/jdk_8310502_test
> cd jdk_8310502_test
> mvn clean package -Dmaven.test.skip
> java -cp target/jdk_8310502_benchmark.jar com.alibaba.openjdk.UUIDUtilsBenchmark
> 
> 
> * benchmark result on Apple MacBook M1 Max
> 
> Benchmark                 Mode  Cnt       Score       Error   Units
> UUIDUtilsBenchmark.fast  thrpt    5  701840.078 ± 57597.624  ops/ms
> UUIDUtilsBenchmark.jdk   thrpt    5  246409.000 ± 84564.009  ops/ms
> 
> 
> * benchmark result on [ecs.c8i.xlarge](https://help.aliyun.com/document_detail/25378.html#c8i)
> 
> Benchmark                 Mode  Cnt       Score      Error   Units
> UUIDUtilsBenchmark.fast  thrpt    5  131595.572 ? 7383.223  ops/ms
> UUIDUtilsBenchmark.jdk   thrpt    5  129610.735 ?  455.752  ops/ms
> 
> 
> * benchmark result on [ecs.c8y.xlarge](https://help.aliyun.com/document_detail/25378.html#c8y)
> 
> Benchmark                 Mode  Cnt       Score      Error   Units
> UUIDUtilsBenchmark.fast  thrpt    5  129445.610 ? 1846.775  ops/ms
> UUIDUtilsBenchmark.jdk   thrpt    5  104651.872 ? 1005.977  ops/ms

> @wenshao Please do not rebase or force-push to an active PR as it invalidates existing review comments. Note for future reference, the bots always squash all changes into a single commit automatically as part of the integration. See [OpenJDK Developers’ Guide](https://openjdk.org/guide/#working-with-pull-requests) for more information.

got it

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PR Comment: https://git.openjdk.org/jdk/pull/14578#issuecomment-1601851348