mapleFU commented on PR #15140:
URL: https://github.com/apache/arrow/pull/15140#issuecomment-1369832525
> > DeltaBitPackingDecode_Int32 runs much faster on my Mac with `Release`.
>
> Much faster than what?
Than running on my PC :) Hold on minutes, I'll take a bath and go back to
upload some flamegraphs
I run with `Release` and the cpu is that:
```
Architecture: arm64
Byte Order: Little Endian
hw.cachelinesize: 128
hw.cachesize: 3626483712 65536 4194304 0 0 0 0 0 0 0
hw.l1dcachesize: 65536
hw.l1icachesize: 131072
hw.l2cachesize: 4194304
```
Output is:
```
BM_DeltaBitPackingDecode_Int64_Equal/1024 1840 ns 1684 ns
430449 bytes_per_second=4.52923G/s
BM_DeltaBitPackingDecode_Int64_Equal/4096 5182 ns 5152 ns
136641 bytes_per_second=5.92317G/s
BM_DeltaBitPackingDecode_Int64_Equal/32768 38807 ns 38666 ns
17960 bytes_per_second=6.31412G/s
BM_DeltaBitPackingDecode_Int64_Equal/65536 76972 ns 76754 ns
9151 bytes_per_second=6.36166G/s
BM_DeltaBitPackingDecode_Int64_Narrow/1024 1505 ns 1500 ns
466906 bytes_per_second=5.08796G/s
BM_DeltaBitPackingDecode_Int64_Narrow/4096 4833 ns 4792 ns
146651 bytes_per_second=6.36798G/s
BM_DeltaBitPackingDecode_Int64_Narrow/32768 36637 ns 36577 ns
18985 bytes_per_second=6.67462G/s
BM_DeltaBitPackingDecode_Int64_Narrow/65536 72851 ns 72692 ns
9634 bytes_per_second=6.71717G/s
BM_DeltaBitPackingDecode_Int64_Wide/1024 1854 ns 1820 ns
388227 bytes_per_second=4.19179G/s
BM_DeltaBitPackingDecode_Int64_Wide/4096 5843 ns 5836 ns
119740 bytes_per_second=5.22964G/s
BM_DeltaBitPackingDecode_Int64_Wide/32768 45144 ns 44884 ns
15624 bytes_per_second=5.43934G/s
BM_DeltaBitPackingDecode_Int64_Wide/65536 90276 ns 89987 ns
7807 bytes_per_second=5.42612G/s
```
And the PLAIN is:
```
BM_PlainDecodingInt64/1024 192 ns 192 ns 3694399
bytes_per_second=39.7522G/s
BM_PlainDecodingInt64/4096 578 ns 578 ns 1283556
bytes_per_second=52.8382G/s
BM_PlainDecodingInt64/32768 4404 ns 4404 ns 160711
bytes_per_second=55.44G/s
BM_PlainDecodingInt64/65536 9092 ns 9064 ns 80755
bytes_per_second=53.8693G/s
```
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