[vectorIntrinsics] RFR: 8263149: Adding some algorithms optimized by Vector API into JMH benc…

[Xiaohong Gong]

On Mon, 8 Mar 2021 03:31:38 GMT, Wang Zhuo <wzhuo at openjdk.org> wrote:

> Here are some code samples for panama-vector vectorIntrinsics JMH benchmarks. 
> These code were developed during our work on optimizing Alibaba applications with Vector API.
> VectorDistance contains Cosine distance and Euclidean distance, scalar code from 
> https://github.com/opendistro-for-elasticsearch/k-NN/blob/aa5d1d40b136e2b3d33a14e80a2a374b2be015f9/src/main/java/com/amazon/opendistroforelasticsearch/knn/plugin/script/KNNScoringUtil.java#L61
> In many scenarios, ElasticSearch engineers reported more than 4X E2E speedup using Vector API.
> 
> BooleanArrayCheck and ValueRangeCheckAndCastL2I were from OLAP applications.
> 
> Co-authored-by: Joshua Zhu <jzhu at openjdk.org>

test/jdk/jdk/incubator/vector/benchmark/src/main/java/benchmark/bigdata/BooleanArrayCheck.java line 2:

> 1: /*
> 2:  * Copyright (c) 2020, 2021, Oracle and/or its affiliates. All rights reserved.

The copyright should be "Copyright (c) 2021, " since this is a new file.

test/jdk/jdk/incubator/vector/benchmark/src/main/java/benchmark/bigdata/BooleanArrayCheck.java line 56:

> 54:     bitsArray = new boolean[ARRAY_LENGTH];
> 55:     for (int i = 0; i < ARRAY_LENGTH; i++) {
> 56:       bitsArray[i] = true;

Is it possible to init random boolean values here? Always `true` might make it possible to make compiler optimize out the `"if (!bitsArray[filterPos])"` in the scalar version?

test/jdk/jdk/incubator/vector/benchmark/src/main/java/benchmark/bigdata/VectorDistance.java line 27:

> 25: 
> 26: import jdk.incubator.vector.*;
> 27: import java.util.Base64;

Move this import down before line 30？

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PR: https://git.openjdk.java.net/panama-vector/pull/45