kaivalnp commented on PR #15742:
URL: https://github.com/apache/lucene/pull/15742#issuecomment-3957276582

   I got my hands on a temporary `x86` EC2 machine. `lscpu` says:
   
   ```
   Architecture:        x86_64
   CPU op-mode(s):      32-bit, 64-bit
   Byte Order:          Little Endian
   CPU(s):              48
   On-line CPU(s) list: 0-47
   Thread(s) per core:  2
   Core(s) per socket:  24
   Socket(s):           1
   NUMA node(s):        1
   Vendor ID:           GenuineIntel
   CPU family:          6
   Model:               85
   Model name:          Intel(R) Xeon(R) Platinum 8175M CPU @ 2.50GHz
   Stepping:            4
   CPU MHz:             3089.456
   BogoMIPS:            4999.99
   Hypervisor vendor:   KVM
   Virtualization type: full
   L1d cache:           32K
   L1i cache:           32K
   L2 cache:            1024K
   L3 cache:            33792K
   NUMA node0 CPU(s):   0-47
   Flags:               fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge 
mca cmov pat pse36 clflush mmx fxsr sse sse2 ss ht syscall nx pdpe1gb rdtscp lm 
constant_tsc arch_perfmon rep_good nopl xtopology nonstop_tsc cpuid aperfmperf 
tsc_known_freq pni pclmulqdq monitor ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic 
movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm 
abm 3dnowprefetch cpuid_fault invpcid_single pti fsgsbase tsc_adjust bmi1 avx2 
smep bmi2 erms invpcid mpx avx512f avx512dq rdseed adx smap clflushopt clwb 
avx512cd avx512bw avx512vl xsaveopt xsavec xgetbv1 xsaves ida arat pku ospke
   ```
   
   Baseline:
   
   ```
   Benchmark                                                       (size)   
Mode  Cnt   Score   Error   Units
   VectorUtilBenchmark.binaryHalfByteDotProductBothPackedVector      1024  
thrpt   15   6.856 ± 0.036  ops/us
   VectorUtilBenchmark.binaryHalfByteDotProductSinglePackedVector    1024  
thrpt   15   8.771 ± 0.047  ops/us
   VectorUtilBenchmark.binaryHalfByteDotProductVector                1024  
thrpt   15  14.856 ± 0.300  ops/us
   VectorUtilBenchmark.binaryHalfByteSquareBothPackedVector          1024  
thrpt   15   6.741 ± 0.069  ops/us
   VectorUtilBenchmark.binaryHalfByteSquareSinglePackedVector        1024  
thrpt   15   8.134 ± 0.069  ops/us
   VectorUtilBenchmark.binaryHalfByteSquareVector                    1024  
thrpt   15  13.244 ± 0.240  ops/us
   ```
   
   This PR (latest changes):
   
   ```
   Benchmark                                                       (size)   
Mode  Cnt   Score   Error   Units
   VectorUtilBenchmark.binaryHalfByteDotProductBothPackedVector      1024  
thrpt   15   6.781 ± 0.086  ops/us
   VectorUtilBenchmark.binaryHalfByteDotProductSinglePackedVector    1024  
thrpt   15   8.806 ± 0.093  ops/us
   VectorUtilBenchmark.binaryHalfByteDotProductVector                1024  
thrpt   15  14.904 ± 0.242  ops/us
   VectorUtilBenchmark.binaryHalfByteSquareBothPackedVector          1024  
thrpt   15   6.685 ± 0.019  ops/us
   VectorUtilBenchmark.binaryHalfByteSquareSinglePackedVector        1024  
thrpt   15   8.755 ± 0.092  ops/us
   VectorUtilBenchmark.binaryHalfByteSquareVector                    1024  
thrpt   15  16.753 ± 0.193  ops/us
   ```
   
   @mccullocht sorry for another iteration, but could you verify performance on 
your `x86` machine with the latest changes?


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