cyb70289 commented on PR #40335:
URL: https://github.com/apache/arrow/pull/40335#issuecomment-1987514574
Did a quick profiling. For gcc, looks Neon code doesn't save total
instructions. Normalize instructions by iteration gives similar result for both
the scalar and neon benchmark.
`ASE_SPEC` in output means total Neon (asimd) instructions.
- profile scalar encode
```
perf stat -e ASE_SPEC,instructions,cycles --
release/parquet-encoding-benchmark
--benchmark_filter=BM_ByteStreamSplitEncode_Double_Scalar/65536
-------------------------------------------------------------------------------------------------------
Benchmark Time CPU
Iterations UserCounters...
-------------------------------------------------------------------------------------------------------
BM_ByteStreamSplitEncode_Double_Scalar/65536 152798 ns 152798 ns
4586 bytes_per_second=3.19561Gi/s
37,622 ASE_SPEC
9,189,030,863 instructions # 3.48 insn per
cycle
2,643,007,625 cycles
```
- profile neon encode
```
perf stat -e ASE_SPEC,instructions,cycles --
release/parquet-encoding-benchmark
--benchmark_filter=BM_ByteStreamSplitEncode_Double_Neon/65536
-----------------------------------------------------------------------------------------------------
Benchmark Time CPU
Iterations UserCounters...
-----------------------------------------------------------------------------------------------------
BM_ByteStreamSplitEncode_Double_Neon/65536 177150 ns 177149 ns
3948 bytes_per_second=2.75633Gi/s
2,985,430,024 ASE_SPEC
7,998,814,771 instructions # 2.94 insn per
cycle
2,718,202,634 cycles
```
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