On Wed, 21 Jun 2023 13:32:32 GMT, 温绍锦 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/UUID
On Wed, 21 Jun 2023 15:21:45 GMT, Roger Riggs wrote:
> CDS can initialize arrays efficiently. The Long class already uses CDS to
> initialize the cache of Long values. See the LongCache code for an example of
> initializing from CDS with a fallback to direct initialization. You could
> move th
> By optimizing the implementation of java.lang.Long#fastUUID, the performance
> of the java.util.UUID#toString method can be significantly improved.
>
> The following are the test results of JMH:
>
> Benchmark Mode Cnt Score Error Units
> UUIDUtilsBenchmark.new
On Wed, 21 Jun 2023 19:02:59 GMT, ExE Boss wrote:
>> src/java.base/share/classes/java/lang/Long.java line 563:
>>
>>> 561: StringUTF16.putChar(buf, 7, (byte) i3);
>>> 562: StringUTF16.putChar(buf, 8, '-');
>>> 563: StringUTF16.putChar(buf, 9, (byte) (i4 >> 8))
> By optimizing the implementation of java.lang.Long#fastUUID, the performance
> of the java.util.UUID#toString method can be significantly improved.
>
> The following are the test results of JMH:
>
> Benchmark Mode Cnt Score Error Units
> UUIDUtilsBenchmark.new
> By optimizing the implementation of java.lang.Long#fastUUID, the performance
> of the java.util.UUID#toString method can be significantly improved.
>
> The following are the test results of JMH:
>
> Benchmark Mode Cnt Score Error Units
> UUIDUtilsBenchmark.new
On Wed, 21 Jun 2023 14:39:18 GMT, 温绍锦 wrote:
>> By optimizing the implementation of java.lang.Long#fastUUID, the performance
>> of the java.util.UUID#toString method can be significantly improved.
>>
>> The following are the test results of JMH:
>>
>> Benchmark Mode Cnt
On Wed, 21 Jun 2023 14:53:22 GMT, Roger Riggs wrote:
>> 温绍锦 has updated the pull request incrementally with one additional commit
>> since the last revision:
>>
>> add annotation Stable
>
> src/java.base/share/classes/java/lang/Long.java line 563:
>
>> 561: StringUTF16.putChar(bu
On Wed, 21 Jun 2023 14:31:20 GMT, Chen Liang wrote:
>> Not sure if this can be applied but some months ago, I optimized Bits to use
>> VarHandles rather than explicitly shifting bits around. This gave us a
>> significant performance increase:
>>
>> https://github.com/openjdk/jdk/pull/11840/fil
On Wed, 21 Jun 2023 14:39:18 GMT, 温绍锦 wrote:
>> By optimizing the implementation of java.lang.Long#fastUUID, the performance
>> of the java.util.UUID#toString method can be significantly improved.
>>
>> The following are the test results of JMH:
>>
>> Benchmark Mode Cnt
> By optimizing the implementation of java.lang.Long#fastUUID, the performance
> of the java.util.UUID#toString method can be significantly improved.
>
> The following are the test results of JMH:
>
> Benchmark Mode Cnt Score Error Units
> UUIDUtilsBenchmark.new
On Wed, 21 Jun 2023 14:13:34 GMT, Per Minborg wrote:
>>> > Another thing to try is moving fastUUID out of Long - moving to an array
>>> > of precomputed hex values means it is not tied to Long internals anymore.
>>>
>>> A note about `@Stable`: `Integer.digits` and `HEX256` are not, and they
>>
On Wed, 21 Jun 2023 09:48:54 GMT, 温绍锦 wrote:
>>> Another thing to try is moving fastUUID out of Long - moving to an array of
>>> precomputed hex values means it is not tied to Long internals anymore.
>>
>> A note about `@Stable`: `Integer.digits` and `HEX256` are not, and they
>> might see per
On Wed, 21 Jun 2023 11:06:08 GMT, 温绍锦 wrote:
>> By optimizing the implementation of java.lang.Long#fastUUID, the performance
>> of the java.util.UUID#toString method can be significantly improved.
>>
>> The following are the test results of JMH:
>>
>> Benchmark Mode Cnt
> By optimizing the implementation of java.lang.Long#fastUUID, the performance
> of the java.util.UUID#toString method can be significantly improved.
>
> The following are the test results of JMH:
>
> Benchmark Mode Cnt Score Error Units
> UUIDUtilsBenchmark.new
On Wed, 21 Jun 2023 10:11:09 GMT, 温绍锦 wrote:
>> By optimizing the implementation of java.lang.Long#fastUUID, the performance
>> of the java.util.UUID#toString method can be significantly improved.
>>
>> The following are the test results of JMH:
>>
>> Benchmark Mode Cnt
> By optimizing the implementation of java.lang.Long#fastUUID, the performance
> of the java.util.UUID#toString method can be significantly improved.
>
> The following are the test results of JMH:
>
> Benchmark Mode Cnt Score Error Units
> UUIDUtilsBenchmark.new
On Wed, 21 Jun 2023 08:58:53 GMT, Chen Liang wrote:
> > Another thing to try is moving fastUUID out of Long - moving to an array of
> > precomputed hex values means it is not tied to Long internals anymore.
>
> A note about `@Stable`: `Integer.digits` and `HEX256` are not, and they might
> see
On Wed, 21 Jun 2023 08:40:43 GMT, 温绍锦 wrote:
>> src/java.base/share/classes/java/lang/Long.java line 97:
>>
>>> 95: + (lo < 10 ? '0' + lo : 'a' + lo - 10));
>>> 96: }
>>> 97: }
>>
>> Are you checking the impact on startup? I guess I would have expected to see
>>
On Wed, 21 Jun 2023 07:58:11 GMT, Alan Bateman wrote:
>> By optimizing the implementation of java.lang.Long#fastUUID, the performance
>> of the java.util.UUID#toString method can be significantly improved.
>>
>> The following are the test results of JMH:
>>
>> Benchmark Mo
On Wed, 21 Jun 2023 07:28:54 GMT, 温绍锦 wrote:
> By optimizing the implementation of java.lang.Long#fastUUID, the performance
> of the java.util.UUID#toString method can be significantly improved.
>
> The following are the test results of JMH:
>
> Benchmark Mode Cnt Sc
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