jpountz commented on PR #12841:
URL: https://github.com/apache/lucene/pull/12841#issuecomment-1846779641
I confirmed there's GC activity happening with the slice approach by using
`-prof gc`:
```
Benchmark
(size) Mode Cnt Score Error Units
GroupVIntBenchmark.mmap_byteBufferReadGroupVInt
64 thrpt 5 11.482 ± 0.727 ops/us
GroupVIntBenchmark.mmap_byteBufferReadGroupVInt:gc.alloc.rate
64 thrpt 5 0.001 ± 0.001 MB/sec
GroupVIntBenchmark.mmap_byteBufferReadGroupVInt:gc.alloc.rate.norm
64 thrpt 5 ≈ 10⁻⁴ B/op
GroupVIntBenchmark.mmap_byteBufferReadGroupVInt:gc.count
64 thrpt 5 ≈ 0 counts
GroupVIntBenchmark.mmap_byteBufferReadGroupVIntBaseline
64 thrpt 5 6.613 ± 0.504 ops/us
GroupVIntBenchmark.mmap_byteBufferReadGroupVIntBaseline:gc.alloc.rate
64 thrpt 5 0.001 ± 0.001 MB/sec
GroupVIntBenchmark.mmap_byteBufferReadGroupVIntBaseline:gc.alloc.rate.norm
64 thrpt 5 ≈ 10⁻⁴ B/op
GroupVIntBenchmark.mmap_byteBufferReadGroupVIntBaseline:gc.count
64 thrpt 5 ≈ 0 counts
GroupVIntBenchmark.mmap_byteBufferReadGroupVInt_viaByteBuffer
64 thrpt 5 0.153 ± 0.002 ops/us
GroupVIntBenchmark.mmap_byteBufferReadGroupVInt_viaByteBuffer:gc.alloc.rate
64 thrpt 5 2391.134 ± 25.909 MB/sec
GroupVIntBenchmark.mmap_byteBufferReadGroupVInt_viaByteBuffer:gc.alloc.rate.norm
64 thrpt 5 16432.009 ± 0.001 B/op
GroupVIntBenchmark.mmap_byteBufferReadGroupVInt_viaByteBuffer:gc.count
64 thrpt 5 202.000 counts
GroupVIntBenchmark.mmap_byteBufferReadGroupVInt_viaByteBuffer:gc.time
64 thrpt 5 129.000 ms
```
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