Use an inline array for decompression scratch #86
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Motivation ---------- This array is small, fixed size, and always created. We can reduce heap allocations if it's inline within the class rather than a separate object on the heap. Modifications ------------- For .NET 8 only use a fixed array to store the block decompression scratch buffer. Results ------- BenchmarkDotNet v0.13.10, Windows 11 (10.0.22621.2861/22H2/2022Update/SunValley2) 12th Gen Intel Core i7-1270P, 1 CPU, 16 logical and 12 physical cores .NET SDK 8.0.100 [Host] : .NET 8.0.0 (8.0.23.53103), X64 RyuJIT AVX2 Job-SOJPFQ : .NET 8.0.0 (8.0.23.53103), X64 RyuJIT AVX2 Job-OKVMCF : .NET 8.0.0 (8.0.23.53103), X64 RyuJIT AVX2 Job-BRDMES : .NET 6.0.25 (6.0.2523.51912), X64 RyuJIT AVX2 Job-AJAIVB : .NET Framework 4.8.1 (4.8.9181.0), X64 RyuJIT VectorSize=256 | Method | Runtime | PGO | Mean | Error | StdDev | Ratio | RatioSD | Rank | Allocated | Alloc Ratio | |------------ |------------------- |---- |---------:|---------:|---------:|------:|--------:|-----:|----------:|------------:| | Array | .NET 8.0 | N | 10.77 us | 0.142 us | 0.132 us | 1.00 | 0.00 | 2 | 112 B | 1.00 | | InlineArray | .NET 8.0 | N | 10.53 us | 0.168 us | 0.157 us | 0.98 | 0.02 | 1 | 80 B | 0.71 | | | | | | | | | | | | | | Array | .NET 8.0 | Y | 10.14 us | 0.114 us | 0.106 us | 1.00 | 0.00 | 1 | 112 B | 1.00 | | InlineArray | .NET 8.0 | Y | 10.11 us | 0.080 us | 0.071 us | 1.00 | 0.02 | 1 | 80 B | 0.71 |
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Motivation
This array is small, fixed size, and always created. We can reduce heap allocations if it's inline within the class rather than a separate object on the heap.
Modifications
For .NET 8 only use a fixed array to store the block decompression scratch buffer.
Results
BenchmarkDotNet v0.13.10, Windows 11 (10.0.22621.2861/22H2/2022Update/SunValley2) 12th Gen Intel Core i7-1270P, 1 CPU, 16 logical and 12 physical cores .NET SDK 8.0.100
[Host] : .NET 8.0.0 (8.0.23.53103), X64 RyuJIT AVX2
Job-SOJPFQ : .NET 8.0.0 (8.0.23.53103), X64 RyuJIT AVX2
Job-OKVMCF : .NET 8.0.0 (8.0.23.53103), X64 RyuJIT AVX2
Job-BRDMES : .NET 6.0.25 (6.0.2523.51912), X64 RyuJIT AVX2
Job-AJAIVB : .NET Framework 4.8.1 (4.8.9181.0), X64 RyuJIT VectorSize=256