On Sun, 25 Jun 2023 12:20:17 GMT, 温绍锦 <d...@openjdk.org> 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 Score Error Units >> UUIDUtilsBenchmark.new thrpt 5 92676.550 ± 292.213 ops/ms >> UUIDUtilsBenchmark.original thrpt 5 37040.165 ± 1023.532 ops/ms > > 温绍锦 has updated the pull request incrementally with one additional commit > since the last revision: > > add jdk.util.HexDigits, sharing cache array across multiple classes, > including : > java.lang.Long#fastUUID > java.util.HexDigits > java.lang.Long#toHexString(future) > java.lang.Integer#toHexString(future) > java.util.HexFormat(future) Should we consider that when COMPACT_STRINGS is false, should it only be guaranteed to work correctly, not the best performance. If based on this principle, the implementation code will be much simpler. ------------- PR Comment: https://git.openjdk.org/jdk/pull/14578#issuecomment-1606171084
