tteofili commented on PR #14191:
URL: https://github.com/apache/lucene/pull/14191#issuecomment-2634633824

   my previous luceneutil runs were useless, now with changes in luceneutil 
(`NoMergePolicy` and no force merge on index side, using the `ExecutorService` 
on the search side), I get far different numbers:
   
   _baseline_
   ```
   recall  latency (ms)    nDoc  topK  fanout  maxConn  beamWidth  quantized  
index s  index docs/s  num segments  index size (MB)  vec disk (MB)  vec RAM 
(MB)
    0.951         1.840  200000   100      50       32        100         no    
12.84      15571.47            33           593.98        585.938       585.938
   ```
   
   _candidate (use first segment)_
   ```
   recall  latency (ms)    nDoc  topK  fanout  maxConn  beamWidth  quantized  
index s  index docs/s  num segments  index size (MB)  vec disk (MB)  vec RAM 
(MB)
    0.999         4.840  200000   100      50       32        100         no    
12.68      15771.63            33           593.99        585.938       585.938
   ```
   
   _candidate (use largest segment)_
   ```
   recall  latency (ms)    nDoc  topK  fanout  maxConn  beamWidth  quantized  
index s  index docs/s  num segments  index size (MB)  vec disk (MB)  vec RAM 
(MB)
    0.999         4.976  200000   100      50       32        100         no    
13.46      14861.05            33           593.98        585.938       585.938
   ```


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