On Thu, 1 Oct 2020 00:13:28 GMT, Stuart Marks <sma...@openjdk.org> wrote:
> Plumb new internal static factory method to trust the array passed in, > avoiding unnecessary copying. JMH results for > the benchmark show about 15% improvement for the cases that were optimized, > namely the 3 to 10 fixed arg cases. > # VM options: -verbose:gc -XX:+UseParallelGC -Xms4g -Xmx4g --enable-preview > -verbose:gc -XX:+UsePara > llelGC -Xms4g -Xmx4g -Xint > # Warmup: 5 iterations, 1 s each > # Measurement: 5 iterations, 2 s each > > WITHOUT varargs optimization: > > Benchmark Mode Cnt Score Error Units > ListArgs.list00 thrpt 15 6019.539 ± 144.040 ops/ms > ListArgs.list01 thrpt 15 1985.009 ± 40.606 ops/ms > ListArgs.list02 thrpt 15 1854.812 ± 17.488 ops/ms > ListArgs.list03 thrpt 15 963.866 ± 10.262 ops/ms > ListArgs.list04 thrpt 15 908.116 ± 6.278 ops/ms > ListArgs.list05 thrpt 15 848.607 ± 16.701 ops/ms > ListArgs.list06 thrpt 15 822.282 ± 8.905 ops/ms > ListArgs.list07 thrpt 15 780.057 ± 11.214 ops/ms > ListArgs.list08 thrpt 15 745.295 ± 19.204 ops/ms > ListArgs.list09 thrpt 15 704.596 ± 14.003 ops/ms > ListArgs.list10 thrpt 15 696.436 ± 4.914 ops/ms > ListArgs.list11 thrpt 15 661.908 ± 11.041 ops/ms > > WITH varargs optimization: > > Benchmark Mode Cnt Score Error Units > ListArgs.list00 thrpt 15 6172.298 ± 62.736 ops/ms > ListArgs.list01 thrpt 15 1987.724 ± 45.468 ops/ms > ListArgs.list02 thrpt 15 1843.419 ± 10.693 ops/ms > ListArgs.list03 thrpt 15 1126.946 ± 30.952 ops/ms > ListArgs.list04 thrpt 15 1050.440 ± 17.859 ops/ms > ListArgs.list05 thrpt 15 999.275 ± 23.656 ops/ms > ListArgs.list06 thrpt 15 948.844 ± 19.615 ops/ms > ListArgs.list07 thrpt 15 897.541 ± 15.531 ops/ms > ListArgs.list08 thrpt 15 853.359 ± 18.755 ops/ms > ListArgs.list09 thrpt 15 826.394 ± 8.284 ops/ms > ListArgs.list10 thrpt 15 779.231 ± 4.104 ops/ms > ListArgs.list11 thrpt 15 650.888 ± 3.948 ops/ms This pull request has now been integrated. Changeset: 88d75c9a Author: Stuart Marks <sma...@openjdk.org> URL: https://git.openjdk.java.net/jdk/commit/88d75c9a Stats: 203 lines in 6 files changed: 185 ins; 0 del; 18 mod 8156071: List.of: reduce array copying during creation Reviewed-by: psandoz, redestad ------------- PR: https://git.openjdk.java.net/jdk/pull/449
