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https://issues.apache.org/jira/browse/LUCENE-10329?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17463755#comment-17463755
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ASF subversion and git services commented on LUCENE-10329:
----------------------------------------------------------
Commit 9c57967de30ac6179898d2fafd2386a0fcec4b44 in lucene's branch
refs/heads/branch_9x from gf2121
[ https://gitbox.apache.org/repos/asf?p=lucene.git;h=9c57967 ]
LUCENE-10329: Use computed mask for DirectMonotonicReader#get (#553)
* use computed mask
* CHANGES
* use block mask for getBounds too
Co-authored-by: guofeng.my <guofeng...@bytedance.com>
> Use Computed Mask For DirectMonotonicReader#get
> -----------------------------------------------
>
> Key: LUCENE-10329
> URL: https://issues.apache.org/jira/browse/LUCENE-10329
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/codecs
> Reporter: Feng Guo
> Priority: Major
> Time Spent: 50m
> Remaining Estimate: 0h
>
> I saw {{DirectMonotonicReader#get}} was the hot method during when running
> luceneutil test, So using a computed mask for DirectMonotonicReader#get
> instead of computing it for every call may make a bit sense :)
> {code:java}
> PERCENT CPU SAMPLES STACK
> 14.07% 66936
> org.apache.lucene.util.packed.DirectMonotonicReader#get()
> 5.93% 28198
> org.apache.lucene.codecs.lucene90.Lucene90DocValuesProducer$17#binaryValue()
> 5.44% 25858
> org.apache.lucene.util.packed.DirectReader$DirectPackedReader12#get()
> 5.27% 25052
> org.apache.lucene.facet.taxonomy.FastTaxonomyFacetCounts#countAll()
> 4.48% 21310 java.nio.ByteBuffer#get()
> 1.83% 8722 java.nio.Buffer#position()
> 1.80% 8573
> jdk.internal.misc.ScopedMemoryAccess#getByteInternal()
> 1.80% 8558
> org.apache.lucene.store.ByteBufferGuard#ensureValid()
> 1.79% 8537 java.nio.Buffer#scope()
> 1.67% 7939
> org.apache.lucene.facet.sortedset.SortedSetDocValuesFacetCounts#countOneSegment()
> 1.51% 7182
> org.apache.lucene.facet.taxonomy.IntTaxonomyFacets#increment()
> 1.43% 6781 java.nio.Buffer#nextGetIndex()
> 1.40% 6657 java.nio.Buffer#checkIndex()
> 1.26% 5979
> org.apache.lucene.codecs.lucene90.Lucene90PostingsReader$EverythingEnum#advance()
> 1.19% 5670 jdk.internal.misc.Unsafe#convEndian()
> 1.17% 5565 java.nio.DirectByteBuffer#ix()
> 1.12% 5310
> org.apache.lucene.search.BooleanScorer$OrCollector#collect()
> 1.07% 5075 org.apache.lucene.store.ByteBufferGuard#getShort()
> 1.06% 5065 org.apache.lucene.search.ConjunctionDISI#doNext()
> 1.03% 4914
> jdk.internal.util.Preconditions#checkFromIndexSize()
> 1.02% 4869
> jdk.internal.misc.ScopedMemoryAccess#getShortUnalignedInternal()
> 0.99% 4719
> org.apache.lucene.store.ByteBufferIndexInput$SingleBufferImpl#seek()
> 0.96% 4587 java.nio.DirectByteBuffer#get()
> 0.96% 4587
> org.apache.lucene.search.MultiCollector$MultiLeafCollector#collect()
> 0.94% 4460
> org.apache.lucene.codecs.lucene90.Lucene90PostingsReader$EverythingEnum#nextPosition()
> 0.90% 4297
> org.apache.lucene.facet.taxonomy.FastTaxonomyFacetCounts#count()
> 0.84% 3996
> org.apache.lucene.search.similarities.BM25Similarity$BM25Scorer#score()
> 0.79% 3769
> org.apache.lucene.search.BooleanScorer#scoreDocument()
> 0.77% 3648
> org.apache.lucene.codecs.lucene90.Lucene90PostingsReader$BlockDocsEnum#nextDoc()
> 0.75% 3572
> org.apache.lucene.codecs.lucene90.Lucene90NormsProducer$3#longValue()
> {code}
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