mikemccand commented on pull request #518:
URL: https://github.com/apache/lucene/pull/518#issuecomment-999103803
Also here is the heap JFR results for `base`:
```
PROFILE SUMMARY from 2423 events (total: 94219M)
tests.profile.mode=heap
tests.profile.count=30
tests.profile.stacksize=1
tests.profile.linenumbers=false
PERCENT HEAP SAMPLES STACK
9.76% 9191M org.apache.lucene.util.FixedBitSet#<init>()
6.93% 6527M
org.apache.lucene.facet.sortedset.SortedSetDocValuesFacetCounts#countOneSegment()
6.07% 5721M
org.apache.lucene.codecs.lucene90.blocktree.SegmentTermsEnumFrame#<init>()
5.77% 5437M
org.apache.lucene.facet.FacetsConfig#stringToPath()
5.20% 4896M
java.util.concurrent.locks.AbstractQueuedSynchronizer#acquire()
3.65% 3436M perf.StatisticsHelper#startStatistics()
3.65% 3436M
java.util.concurrent.CopyOnWriteArrayList#iterator()
3.46% 3255M java.lang.StringUTF16#compress()
3.39% 3195M java.util.ArrayList#grow()
2.97% 2800M org.apache.lucene.util.BytesRef#utf8ToString()
2.91% 2743M
org.apache.lucene.facet.taxonomy.IntTaxonomyFacets#<init>()
2.69% 2534M
jdk.internal.misc.Unsafe#allocateUninitializedArray()
2.54% 2396M java.util.AbstractList#iterator()
2.33% 2199M
org.apache.lucene.codecs.lucene90.Lucene90PostingsReader$BlockDocsEnum#<init>()
2.20% 2070M
org.apache.lucene.codecs.lucene90.blocktree.SegmentTermsEnum#getFrame()
2.01% 1889M
org.apache.lucene.util.fst.ByteSequenceOutputs#read()
1.82% 1718M
org.apache.lucene.queryparser.charstream.FastCharStream#refill()
1.81% 1709M org.apache.lucene.util.BytesRef#<init>()
1.48% 1392M
org.apache.lucene.util.DocIdSetBuilder$Buffer#<init>()
1.29% 1219M
org.apache.lucene.codecs.lucene90.blocktree.IntersectTermsEnumFrame#load()
1.25% 1176M
org.apache.lucene.codecs.lucene90.blocktree.SegmentTermsEnum#<init>()
1.23% 1159M
org.apache.lucene.codecs.lucene90.Lucene90DocValuesProducer$TermsDict#decompressBlock()
1.20% 1133M
jdk.internal.foreign.MappedMemorySegmentImpl#dup()
1.14% 1073M org.apache.lucene.search.BooleanScorer#<init>()
1.03% 970M
org.apache.lucene.codecs.lucene90.Lucene90PostingsReader$BlockImpactsDocsEnum#<init>()
1.03% 970M
org.apache.lucene.search.ExactPhraseMatcher$1#getImpacts()
0.97% 910M
org.apache.lucene.codecs.lucene90.blocktree.SegmentTermsEnum#getArc()
0.88% 833M
org.apache.lucene.codecs.lucene90.Lucene90PostingsReader$BlockImpactsPostingsEnum#<init>()
0.88% 833M
org.apache.lucene.codecs.lucene90.ForUtil#<init>()
0.87% 816M
```
and for `new-mmap`:
```
PROFILE SUMMARY from 2424 events (total: 96906M)
tests.profile.mode=heap
tests.profile.count=30
tests.profile.stacksize=1
tests.profile.linenumbers=false
PERCENT HEAP SAMPLES STACK
10.17% 9854M org.apache.lucene.util.FixedBitSet#<init>()
6.96% 6743M
org.apache.lucene.facet.FacetsConfig#stringToPath()
6.84% 6631M
org.apache.lucene.facet.sortedset.SortedSetDocValuesFacetCounts#countOneSegment()
5.16% 4999M
java.util.concurrent.locks.AbstractQueuedSynchronizer#acquire()
4.18% 4054M
org.apache.lucene.codecs.lucene90.blocktree.SegmentTermsEnumFrame#<init>()
3.58% 3470M org.apache.lucene.util.BytesRef#utf8ToString()
3.55% 3436M perf.StatisticsHelper#startStatistics()
3.55% 3436M
java.util.concurrent.CopyOnWriteArrayList#iterator()
3.49% 3379M
org.apache.lucene.facet.taxonomy.IntTaxonomyFacets#<init>()
2.77% 2688M java.util.ArrayList#grow()
2.71% 2628M java.lang.StringUTF16#compress()
2.54% 2465M
org.apache.lucene.codecs.lucene90.blocktree.SegmentTermsEnum#getFrame()
2.15% 2087M java.util.AbstractList#iterator()
2.05% 1984M
org.apache.lucene.codecs.lucene90.Lucene90PostingsReader$BlockDocsEnum#<init>()
1.94% 1881M
org.apache.lucene.util.fst.ByteSequenceOutputs#read()
1.84% 1786M
jdk.internal.misc.Unsafe#allocateUninitializedArray()
1.74% 1683M java.nio.DirectByteBufferR#duplicate()
1.65% 1598M
org.apache.lucene.util.DocIdSetBuilder$Buffer#<init>()
1.47% 1426M org.apache.lucene.util.BytesRef#<init>()
1.40% 1357M java.nio.DirectByteBufferR#asLongBuffer()
1.27% 1228M
org.apache.lucene.search.ExactPhraseMatcher$1#getImpacts()
1.24% 1202M
org.apache.lucene.queryparser.charstream.FastCharStream#refill()
1.24% 1202M
org.apache.lucene.codecs.lucene90.Lucene90PostingsReader#newTermState()
1.15% 1116M
org.apache.lucene.codecs.lucene90.Lucene90PostingsReader$BlockImpactsDocsEnum#<init>()
1.13% 1090M
org.apache.lucene.codecs.lucene90.blocktree.SegmentTermsEnum#<init>()
1.10% 1065M
org.apache.lucene.store.ByteBufferIndexInput#newCloneInstance()
1.05% 1013M java.nio.DirectByteBufferR#slice()
0.91% 884M
org.apache.lucene.codecs.lucene90.Lucene90PostingsReader$BlockImpactsPostingsEnum#<init>()
0.88% 850M org.apache.lucene.search.BooleanScorer#<init>()
0.86% 833M
```
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