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https://issues.apache.org/jira/browse/LUCENE-9838?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17301264#comment-17301264
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Robert Muir commented on LUCENE-9838:
-------------------------------------
I attached a patch. You have to run compile/tests with java 16 to use it: pass
something like {{-Pruntime.java.home=/home/rmuir/Downloads/jdk-16}} to gradle.
If you are running with java manually you must add {{--add-modules
jdk.incubator.vector}} to commandline flags (javac too).
Performance improvements are large for big vectors (e.g. up to 6x faster than
master)
{noformat}
Benchmark (size) Mode Cnt Score Error Units
DotProduct.dotProductOld 1 thrpt 15 185.520 ± 0.649 ops/us
DotProduct.dotProductNew 1 thrpt 15 155.562 ± 0.460 ops/us
DotProduct.dotProductOld 4 thrpt 15 134.033 ± 0.622 ops/us
DotProduct.dotProductNew 4 thrpt 15 113.170 ± 0.754 ops/us
DotProduct.dotProductOld 6 thrpt 15 127.956 ± 0.554 ops/us
DotProduct.dotProductNew 6 thrpt 15 92.949 ± 0.260 ops/us
DotProduct.dotProductOld 8 thrpt 15 95.313 ± 0.600 ops/us
DotProduct.dotProductNew 8 thrpt 15 84.722 ± 0.340 ops/us
DotProduct.dotProductOld 13 thrpt 15 71.914 ± 0.323 ops/us
DotProduct.dotProductNew 13 thrpt 15 70.842 ± 0.132 ops/us
DotProduct.dotProductOld 16 thrpt 15 67.188 ± 0.204 ops/us
DotProduct.dotProductNew 16 thrpt 15 64.332 ± 0.444 ops/us
DotProduct.dotProductOld 25 thrpt 15 45.503 ± 0.188 ops/us
DotProduct.dotProductNew 25 thrpt 15 39.183 ± 2.068 ops/us
DotProduct.dotProductOld 32 thrpt 15 40.592 ± 0.162 ops/us
DotProduct.dotProductNew 32 thrpt 15 60.468 ± 0.426 ops/us
DotProduct.dotProductOld 64 thrpt 15 23.123 ± 0.136 ops/us
DotProduct.dotProductNew 64 thrpt 15 52.654 ± 0.346 ops/us
DotProduct.dotProductOld 100 thrpt 15 14.325 ± 0.077 ops/us
DotProduct.dotProductNew 100 thrpt 15 36.043 ± 0.678 ops/us
DotProduct.dotProductOld 128 thrpt 15 12.313 ± 0.061 ops/us
DotProduct.dotProductNew 128 thrpt 15 44.195 ± 0.218 ops/us
DotProduct.dotProductOld 207 thrpt 15 7.776 ± 0.045 ops/us
DotProduct.dotProductNew 207 thrpt 15 22.242 ± 0.155 ops/us
DotProduct.dotProductOld 256 thrpt 15 6.367 ± 0.031 ops/us
DotProduct.dotProductNew 256 thrpt 15 29.054 ± 0.108 ops/us
DotProduct.dotProductOld 300 thrpt 15 5.069 ± 0.022 ops/us
DotProduct.dotProductNew 300 thrpt 15 20.143 ± 0.327 ops/us
DotProduct.dotProductOld 512 thrpt 15 3.235 ± 0.018 ops/us
DotProduct.dotProductNew 512 thrpt 15 18.042 ± 0.132 ops/us
DotProduct.dotProductOld 702 thrpt 15 2.373 ± 0.009 ops/us
DotProduct.dotProductNew 702 thrpt 15 11.626 ± 0.026 ops/us
DotProduct.dotProductOld 1024 thrpt 15 1.615 ± 0.005 ops/us
DotProduct.dotProductNew 1024 thrpt 15 10.290 ± 0.084 ops/us
{noformat}
> simd version of VectorUtil.dotProduct
> -------------------------------------
>
> Key: LUCENE-9838
> URL: https://issues.apache.org/jira/browse/LUCENE-9838
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Robert Muir
> Priority: Major
> Attachments: LUCENE-9838.patch
>
>
> Followup to LUCENE-9837
> Let's explore using JDK 16 vector API to speed this up more. It might be a
> hassle to try to MR-JAR/package up for users (adding commandline flags and
> stuff), but it gives good performance.
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