kaivalnp commented on PR #15010:
URL: https://github.com/apache/lucene/pull/15010#issuecomment-3134744902
Sharing some benchmarks..
`10_x` with `-reindex`:
```
recall latency(ms) netCPU avgCpuCount nDoc topK fanout maxConn
beamWidth quantized index(s) index_docs/s force_merge(s) num_segments
index_size(MB) vec_disk(MB) vec_RAM(MB) indexType
0.963 1.889 1.888 0.999 100000 100 50 64
250 no 11.57 8641.55 24.98 1
77.49 292.969 292.969 HNSW
```
`10_x` without `-reindex`:
```
recall latency(ms) netCPU avgCpuCount nDoc topK fanout maxConn
beamWidth quantized index(s) index_docs/s force_merge(s) num_segments
index_size(MB) vec_disk(MB) vec_RAM(MB) indexType
0.963 1.202 1.200 0.999 100000 100 50 64
250 no 0.00 Infinity 0.12 1
77.49 292.969 292.969 HNSW
```
This PR with `-reindex`:
```
recall latency(ms) netCPU avgCpuCount nDoc topK fanout maxConn
beamWidth quantized index(s) index_docs/s force_merge(s) num_segments
index_size(MB) vec_disk(MB) vec_RAM(MB) indexType
0.962 1.193 1.192 0.999 100000 100 50 64
250 no 11.47 8716.12 24.22 1
77.47 292.969 292.969 HNSW
```
This PR without `-reindex`:
```
recall latency(ms) netCPU avgCpuCount nDoc topK fanout maxConn
beamWidth quantized index(s) index_docs/s force_merge(s) num_segments
index_size(MB) vec_disk(MB) vec_RAM(MB) indexType
0.962 1.177 1.176 0.999 100000 100 50 64
250 no 0.00 Infinity 0.12 1
77.47 292.969 292.969 HNSW
```
**Note**: I ran these with
`-XX:CompileCommand=inline,*PanamaVectorUtilSupport.*` to avoid the cold-start
problem!
I see \~37% improvement in the "search after indexing" case, and no
difference in the "only search" case -- the trend matches the original PR
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