gf2121 commented on PR #14203:
URL: https://github.com/apache/lucene/pull/14203#issuecomment-2726739699
On the AVX-512 machine:
* Specialized read does not vectorize the remainder loop, it seems the
complier failed to inline it.
* Specialized decode vectorizes the remainder loop.
* Push masks to remainder loop seems to get a better performance.
I pushed the benchmark code to the patch, here is result on my machine:
```
Benchmark Mode Cnt
Score Error Units
InnerLoopDecodingBenchmark.hybridInnerLoop thrpt 5
76.311 ? 0.177 ops/ms
InnerLoopDecodingBenchmark.hybridInnerLoop:asm thrpt
NaN ---
InnerLoopDecodingBenchmark.specializedDecode thrpt 5
73.600 ? 0.123 ops/ms
InnerLoopDecodingBenchmark.specializedDecode:asm thrpt
NaN ---
InnerLoopDecodingBenchmark.specializedDecodeMaskInRemainder thrpt 5
80.902 ? 0.046 ops/ms
InnerLoopDecodingBenchmark.specializedDecodeMaskInRemainder:asm thrpt
NaN ---
InnerLoopDecodingBenchmark.specializedRead thrpt 5
37.195 ? 0.099 ops/ms
InnerLoopDecodingBenchmark.specializedRead:asm thrpt
NaN ---
```
**LuceneUtil**
hybridInnerLoop (baseline) vs specializedRead (candidate)
```
TaskQPS baseline StdDevQPS
my_modified_version StdDev Pct diff p-value
IntNRQ 83.50 (3.7%) 78.07
(4.1%) -6.5% ( -13% - 1%) 0.000
FilteredIntNRQ 81.66 (3.6%) 76.50
(3.8%) -6.3% ( -13% - 1%) 0.000
CountFilteredIntNRQ 44.30 (1.9%) 43.07
(2.8%) -2.8% ( -7% - 1%) 0.000
IntSet 94.41 (1.7%) 94.38
(1.0%) -0.0% ( -2% - 2%) 0.940
```
hybridInnerLoop (baseline) vs specializedDecodeMaskInRemainder (candidate)
```
TaskQPS baseline StdDevQPS
my_modified_version StdDev Pct diff p-value
IntSet 96.10 (1.1%) 94.85
(1.5%) -1.3% ( -3% - 1%) 0.039
CountFilteredIntNRQ 43.67 (2.3%) 44.78
(2.8%) 2.6% ( -2% - 7%) 0.036
IntNRQ 81.12 (2.9%) 84.52
(4.1%) 4.2% ( -2% - 11%) 0.013
FilteredIntNRQ 78.94 (3.0%) 83.07
(4.1%) 5.2% ( -1% - 12%) 0.002
```
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