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https://issues.apache.org/jira/browse/LUCENE-8932?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16959162#comment-16959162
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Jack Conradson commented on LUCENE-8932:
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[~jpountz] Thanks for looking again. I have added a second constructor for
BKDOffHeapInput to match the clone method in BKDOnHeapInput as requested.
> Allow BKDReader packedIndex to be off heap
> ------------------------------------------
>
> Key: LUCENE-8932
> URL: https://issues.apache.org/jira/browse/LUCENE-8932
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Jack Conradson
> Priority: Minor
> Attachments: LUCENE-8932.patch, LUCENE-8932.patch
>
>
> This change modifies BKDReader to read the packedIndex bytes off heap rather
> than load them all on heap at a single time.
> Questions for discussion:
> # Should BKDReader only support packedIndex off heap?
> # If not, how should the choice be made?
> Using luceneutils IndexAndSearchOpenStreetMaps present the following test
> results:
> with -box -points (patch)
> READER MB: 1.1345596313476562
> BEST M hits/sec: 73.34277344984474
> BEST QPS: 74.63011169783009
> with -box -points (original)
> READER MB: 1.7249317169189453
> BEST M hits/sec: 73.77125157623486
> BEST QPS: 75.06611062353801
> with -nearest 10 -points (patch)
> READER MB: 1.1345596313476562
> BEST M hits/sec: 0.013586298373879497
> BEST QPS: 1358.6298373879497
> with -nearest 10 -points (original)
> READER MB: 1.7249317169189453
> BEST M hits/sec: 0.01445208197367343
> BEST QPS: 1445.208197367343
> with -box -geo3d (patch)
> READER MB: 1.1345596313476562
> BEST M hits/sec: 39.84968715299074
> BEST QPS: 40.54914292796736
> with -box -geo3d (original)
> READER MB: 1.7456226348876953
> BEST M hits/sec: 40.45051734329004
> BEST QPS: 41.160519101846695
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