There are various ways to remove spaces from text, but which everyday way is the best?
BenchmarkDotNet v0.14.0, Windows 10 (10.0.19045.5131/22H2/2022Update)
AMD Ryzen 9 9950X, 1 CPU, 32 logical and 16 physical cores
.NET SDK 9.0.100
[Host] : .NET 9.0.0 (9.0.24.52809), X64 RyuJIT AVX-512F+CD+BW+DQ+VL+VBMI
.NET 8.0 : .NET 8.0.11 (8.0.1124.51707), X64 RyuJIT AVX-512F+CD+BW+DQ+VL+VBMI
.NET 9.0 : .NET 9.0.0 (9.0.24.52809), X64 RyuJIT AVX-512F+CD+BW+DQ+VL+VBMI
| Method | Runtime | Mean | Error | StdDev | Ratio | RatioSD | Gen0 | Gen1 | Allocated | Alloc Ratio |
|-------------- |--------- |-----------:|---------:|---------:|------:|--------:|-------:|-------:|----------:|------------:|
| Regex | .NET 8.0 | 656.2 ns | 7.17 ns | 6.36 ns | 1.06 | 0.01 | 0.0629 | - | 1.03 KB | 1.00 |
| Regex | .NET 9.0 | 617.5 ns | 3.67 ns | 3.44 ns | 1.00 | 0.01 | 0.0629 | - | 1.03 KB | 1.00 |
| | | | | | | | | | | |
| String | .NET 8.0 | 1,074.5 ns | 9.94 ns | 9.29 ns | 1.21 | 0.01 | 0.0629 | - | 1.05 KB | 1.00 |
| String | .NET 9.0 | 887.9 ns | 2.59 ns | 2.29 ns | 1.00 | 0.00 | 0.0639 | - | 1.05 KB | 1.00 |
| | | | | | | | | | | |
| Span | .NET 8.0 | 288.8 ns | 5.67 ns | 6.31 ns | 1.53 | 0.04 | 0.0639 | - | 1.05 KB | 1.00 |
| Span | .NET 9.0 | 188.4 ns | 2.61 ns | 2.45 ns | 1.00 | 0.02 | 0.0639 | - | 1.05 KB | 1.00 |
| | | | | | | | | | | |
| StringBuilder | .NET 8.0 | 1,042.8 ns | 8.32 ns | 7.78 ns | 1.20 | 0.02 | 0.1411 | - | 2.33 KB | 1.00 |
| StringBuilder | .NET 9.0 | 871.6 ns | 13.50 ns | 12.63 ns | 1.00 | 0.02 | 0.1421 | - | 2.33 KB | 1.00 |
| | | | | | | | | | | |
| JoinSplit | .NET 8.0 | 688.6 ns | 4.47 ns | 4.18 ns | 1.06 | 0.01 | 0.2422 | 0.0010 | 3.97 KB | 1.00 |
| JoinSplit | .NET 9.0 | 650.9 ns | 7.26 ns | 6.79 ns | 1.00 | 0.01 | 0.2422 | 0.0010 | 3.97 KB | 1.00 |
| | | | | | | | | | | |
| ConcatSplit | .NET 8.0 | 680.3 ns | 10.91 ns | 10.20 ns | 1.07 | 0.02 | 0.2251 | 0.0010 | 3.68 KB | 1.00 |
| ConcatSplit | .NET 9.0 | 634.2 ns | 11.93 ns | 11.15 ns | 1.00 | 0.02 | 0.2251 | 0.0010 | 3.68 KB | 1.00 |
| | | | | | | | | | | |
| SpanArrayPool | .NET 8.0 | 312.7 ns | 3.35 ns | 3.13 ns | 0.98 | 0.01 | 0.0629 | - | 1.03 KB | 1.00 |
| SpanArrayPool | .NET 9.0 | 318.8 ns | 3.48 ns | 3.26 ns | 1.00 | 0.01 | 0.0629 | - | 1.03 KB | 1.00 |
| | | | | | | | | | | |
| SpanStackPool | .NET 8.0 | 370.0 ns | 2.87 ns | 2.69 ns | 1.27 | 0.02 | 0.0629 | - | 1.03 KB | 1.00 |
| SpanStackPool | .NET 9.0 | 291.1 ns | 5.08 ns | 4.75 ns | 1.00 | 0.02 | 0.0629 | - | 1.03 KB | 1.00 |- 🚀 There are big differences in the performance and allocation of memory
- 🚀 In this rather small example, Span is by far the fastest variant
- 🚀 StringBuilder is the slowest and most expensive variant
- Regex doesn't do badly, but is only in the midfield and slower than all Span variants
- Maximum performance should be possible with vectorization and e.g. SSE2, which I exclude here in the sense of everyday code.
dotnet run -c Release --framework net9.0