RamakrishnaChilaka commented on PR #15043:
URL: https://github.com/apache/lucene/pull/15043#issuecomment-3173640927

   On Intel i5-13600k, we observe
   
   | dims | scalar (ops/µs) | vector (ops/µs) | speed-up |
   | ---- | --------------- | --------------- | -------- |
   | 128  | 53.1            | 144.4           | **2.7×** |
   | 256  | 22.9            | 79.6            | **3.5×** |
   | 512  | 10.7            | 50.5            | **4.7×** |
   | 1024 | 5.1             | 29.1            | **5.7×** |
   
   
   ```
   Benchmark                              (size)   Mode  Cnt    Score   Error   
Units
   VectorUtilBenchmark.l2Normalize             1  thrpt   15  704.792 ± 1.512  
ops/us
   VectorUtilBenchmark.l2Normalize           128  thrpt   15   53.104 ± 0.157  
ops/us
   VectorUtilBenchmark.l2Normalize           207  thrpt   15   29.165 ± 0.049  
ops/us
   VectorUtilBenchmark.l2Normalize           256  thrpt   15   22.948 ± 0.030  
ops/us
   VectorUtilBenchmark.l2Normalize           300  thrpt   15   19.128 ± 0.190  
ops/us
   VectorUtilBenchmark.l2Normalize           512  thrpt   15   10.685 ± 0.047  
ops/us
   VectorUtilBenchmark.l2Normalize           702  thrpt   15    7.594 ± 0.019  
ops/us
   VectorUtilBenchmark.l2Normalize          1024  thrpt   15    5.146 ± 0.012  
ops/us
   VectorUtilBenchmark.l2NormalizeVector       1  thrpt   75  693.185 ± 3.518  
ops/us
   VectorUtilBenchmark.l2NormalizeVector     128  thrpt   75  144.429 ± 3.034  
ops/us
   VectorUtilBenchmark.l2NormalizeVector     207  thrpt   75   87.284 ± 2.202  
ops/us
   VectorUtilBenchmark.l2NormalizeVector     256  thrpt   75   79.614 ± 7.201  
ops/us
   VectorUtilBenchmark.l2NormalizeVector     300  thrpt   75   72.704 ± 2.182  
ops/us
   VectorUtilBenchmark.l2NormalizeVector     512  thrpt   75   50.513 ± 3.980  
ops/us
   VectorUtilBenchmark.l2NormalizeVector     702  thrpt   75   36.002 ± 1.115  
ops/us
   VectorUtilBenchmark.l2NormalizeVector    1024  thrpt   75   29.094 ± 1.597  
ops/us
   ```


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