gf2121 commented on PR #12775:
URL: https://github.com/apache/lucene/pull/12775#issuecomment-1801136851

   Something odd: I accidentally run the benchmark on another mac with `intel 
chip` and the result is disappointing (no obvious improvements)
   ```
   use stable sort: false, sort 5169965 terms, took: 5377ms
   use stable sort: false, sort 5169965 terms, took: 5293ms
   use stable sort: false, sort 5169965 terms, took: 5347ms
   use stable sort: false, sort 5169965 terms, took: 5285ms
   use stable sort: false, sort 5169965 terms, took: 5307ms
   use stable sort: false, sort 5169965 terms, took: 5373ms
   use stable sort: false, sort 5169965 terms, took: 5416ms
   use stable sort: false, sort 5169965 terms, took: 5321ms
   use stable sort: false, sort 5169965 terms, took: 5343ms
   use stable sort: false, sort 5169965 terms, took: 5278ms
   use stable sort: false, sort 5169965 terms, took: 5323ms
   
   use stable sort: true, sort 5169965 terms, took: 5261ms
   use stable sort: true, sort 5169965 terms, took: 5329ms
   use stable sort: true, sort 5169965 terms, took: 5304ms
   use stable sort: true, sort 5169965 terms, took: 5268ms
   use stable sort: true, sort 5169965 terms, took: 5331ms
   use stable sort: true, sort 5169965 terms, took: 5306ms
   use stable sort: true, sort 5169965 terms, took: 5232ms
   use stable sort: true, sort 5169965 terms, took: 5245ms
   use stable sort: true, sort 5169965 terms, took: 5248ms
   use stable sort: true, sort 5169965 terms, took: 5218ms
   use stable sort: true, sort 5169965 terms, took: 5193ms
   ```
   
   But I can easily reproduce the speedup on the `M2 chip` mac that produced 
all benchmark results above:
   ```
   use stable sort: false, sort 5169965 terms, took: 2340ms
   use stable sort: false, sort 5169965 terms, took: 2197ms
   use stable sort: false, sort 5169965 terms, took: 2288ms
   use stable sort: false, sort 5169965 terms, took: 2320ms
   use stable sort: false, sort 5169965 terms, took: 2227ms
   use stable sort: false, sort 5169965 terms, took: 2238ms
   use stable sort: false, sort 5169965 terms, took: 2256ms
   use stable sort: false, sort 5169965 terms, took: 2287ms
   use stable sort: false, sort 5169965 terms, took: 2244ms
   use stable sort: false, sort 5169965 terms, took: 2240ms
   use stable sort: false, sort 5169965 terms, took: 2320ms
   
   use stable sort: true, sort 5169965 terms, took: 1418ms
   use stable sort: true, sort 5169965 terms, took: 1303ms
   use stable sort: true, sort 5169965 terms, took: 1290ms
   use stable sort: true, sort 5169965 terms, took: 1349ms
   use stable sort: true, sort 5169965 terms, took: 1293ms
   use stable sort: true, sort 5169965 terms, took: 1329ms
   use stable sort: true, sort 5169965 terms, took: 1332ms
   use stable sort: true, sort 5169965 terms, took: 1307ms
   use stable sort: true, sort 5169965 terms, took: 1280ms
   use stable sort: true, sort 5169965 terms, took: 1336ms
   use stable sort: true, sort 5169965 terms, took: 1302ms
   ```


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