Experiments with buffering stream reading to improve performance of multiple short reads.
BufferReadStream works as intended on NET Core platforms but suffers sever performance issues on NET Framework. However, the same code when implemented as a wrapper with no inheritance from Stream runs as expected on NET Framework.
I'd really like to know why this is the case?
BenchmarkDotNet=v0.12.1, OS=Windows 10.0.18363.778 (1909/November2018Update/19H2)
Intel Core i7-8650U CPU 1.90GHz (Kaby Lake R), 1 CPU, 8 logical and 4 physical cores
.NET Core SDK=3.1.300-preview-015095
[Host] : .NET Core 3.1.3 (CoreCLR 4.700.20.11803, CoreFX 4.700.20.12001), X64 RyuJIT
Job-BGLOUD : .NET Framework 4.8 (4.8.4121.0), X64 RyuJIT
Job-CUMLBX : .NET Core 2.1.17 (CoreCLR 4.6.28619.01, CoreFX 4.6.28619.01), X64 RyuJIT
Job-BIWYTD : .NET Core 3.1.3 (CoreCLR 4.700.20.11803, CoreFX 4.700.20.12001), X64 RyuJIT
IterationCount=3 LaunchCount=1 WarmupCount=3| Method | Job | Runtime | Mean | Error | StdDev | Ratio | RatioSD |
|---|---|---|---|---|---|---|---|
| StandardStreamRead | Job-BGLOUD | .NET 4.7.2 | 54.939 us | 15.6522 us | 0.8579 us | 0.66 | 0.01 |
| BufferedReadStreamRead | Job-BGLOUD | .NET 4.7.2 | 75.760 us | 2.4355 us | 0.1335 us | 0.91 | 0.01 |
| BufferedReadStreamWrapRead | Job-BGLOUD | .NET 4.7.2 | 38.417 us | 6.0844 us | 0.3335 us | 0.46 | 0.00 |
| StandardStreamReadByte | Job-BGLOUD | .NET 4.7.2 | 83.327 us | 8.0045 us | 0.4388 us | 1.00 | 0.00 |
| BufferedReadStreamReadByte | Job-BGLOUD | .NET 4.7.2 | 101.489 us | 3.1471 us | 0.1725 us | 1.22 | 0.01 |
| BufferedReadStreamWrapReadByte | Job-BGLOUD | .NET 4.7.2 | 14.795 us | 5.3215 us | 0.2917 us | 0.18 | 0.00 |
| ArrayReadByte | Job-BGLOUD | .NET 4.7.2 | 10.183 us | 0.1695 us | 0.0093 us | 0.12 | 0.00 |
| StandardStreamRead | Job-CUMLBX | .NET Core 2.1 | 52.599 us | 7.8719 us | 0.4315 us | 0.68 | 0.01 |
| BufferedReadStreamRead | Job-CUMLBX | .NET Core 2.1 | 31.800 us | 8.1967 us | 0.4493 us | 0.41 | 0.01 |
| BufferedReadStreamWrapRead | Job-CUMLBX | .NET Core 2.1 | 32.040 us | 3.8141 us | 0.2091 us | 0.41 | 0.00 |
| StandardStreamReadByte | Job-CUMLBX | .NET Core 2.1 | 77.764 us | 3.6278 us | 0.1989 us | 1.00 | 0.00 |
| BufferedReadStreamReadByte | Job-CUMLBX | .NET Core 2.1 | 13.907 us | 24.1798 us | 1.3254 us | 0.18 | 0.02 |
| BufferedReadStreamWrapReadByte | Job-CUMLBX | .NET Core 2.1 | 13.166 us | 0.7063 us | 0.0387 us | 0.17 | 0.00 |
| ArrayReadByte | Job-CUMLBX | .NET Core 2.1 | 9.545 us | 0.2658 us | 0.0146 us | 0.12 | 0.00 |
| StandardStreamRead | Job-BIWYTD | .NET Core 3.1 | 49.692 us | 5.1482 us | 0.2822 us | 0.67 | 0.01 |
| BufferedReadStreamRead | Job-BIWYTD | .NET Core 3.1 | 26.924 us | 16.9050 us | 0.9266 us | 0.36 | 0.01 |
| BufferedReadStreamWrapRead | Job-BIWYTD | .NET Core 3.1 | 36.065 us | 57.5055 us | 3.1521 us | 0.49 | 0.05 |
| StandardStreamReadByte | Job-BIWYTD | .NET Core 3.1 | 73.977 us | 12.9548 us | 0.7101 us | 1.00 | 0.00 |
| BufferedReadStreamReadByte | Job-BIWYTD | .NET Core 3.1 | 14.710 us | 21.7169 us | 1.1904 us | 0.20 | 0.01 |
| BufferedReadStreamWrapReadByte | Job-BIWYTD | .NET Core 3.1 | 20.235 us | 2.7917 us | 0.1530 us | 0.27 | 0.00 |
| ArrayReadByte | Job-BIWYTD | .NET Core 3.1 | 13.218 us | 1.1534 us | 0.0632 us | 0.18 | 0.00 |
// * Legends *
Mean : Arithmetic mean of all measurements
Error : Half of 99.9% confidence interval
StdDev : Standard deviation of all measurements
Ratio : Mean of the ratio distribution ([Current]/[Baseline])
RatioSD : Standard deviation of the ratio distribution ([Current]/[Baseline])
1 us : 1 Microsecond (0.000001 sec)