AddictedCS commented on issue #933:
URL: https://github.com/apache/lucenenet/issues/933#issuecomment-2016807325
I may have narrowed down the issue to the `Buffer Size` value. If the buffer
size is larger than the payload, performance drops significantly on NET 8.
```
BenchmarkDotNet v0.13.12, macOS Sonoma 14.4 (23E214) [Darwin 23.4.0]
Apple M2 Max, 1 CPU, 12 logical and 12 physical cores
.NET SDK 8.0.203
[Host] : .NET 8.0.3 (8.0.324.11423), Arm64 RyuJIT AdvSIMD
.NET 7.0 : .NET 7.0.5 (7.0.523.17405), Arm64 RyuJIT AdvSIMD
.NET 8.0 : .NET 8.0.3 (8.0.324.11423), Arm64 RyuJIT AdvSIMD
Server=True
| Method | Job | Runtime | BufferSize | Mean | Error |
StdDev | Ratio | RatioSD |
|----------- |--------- |--------- |-----------
|------------:|-----------:|-----------:|-------:|--------:|
| Write1Kb | .NET 7.0 | .NET 7.0 | 1024 | 4,887.55 μs | 93.198 μs |
117.866 μs | 1.00 | 0.00 |
| Write1Kb | .NET 8.0 | .NET 8.0 | 1024 | 4,801.20 μs | 95.386 μs |
207.361 μs | 0.97 | 0.06 |
| | | | | | |
| | |
| Write2Kb | .NET 7.0 | .NET 7.0 | 1024 | 5,008.96 μs | 98.276 μs |
140.944 μs | 1.00 | 0.00 |
| Write2Kb | .NET 8.0 | .NET 8.0 | 1024 | 4,749.93 μs | 94.161 μs |
267.120 μs | 0.97 | 0.05 |
| | | | | | |
| | |
| Write4Kb | .NET 7.0 | .NET 7.0 | 1024 | 4,961.12 μs | 98.620 μs |
216.472 μs | 1.00 | 0.00 |
| Write4Kb | .NET 8.0 | .NET 8.0 | 1024 | 4,886.21 μs | 97.469 μs |
285.861 μs | 0.97 | 0.07 |
| | | | | | |
| | |
| Write512Kb | .NET 7.0 | .NET 7.0 | 1024 | 5,310.07 μs | 104.943 μs |
204.684 μs | 1.00 | 0.00 |
| Write512Kb | .NET 8.0 | .NET 8.0 | 1024 | 5,110.50 μs | 99.717 μs |
271.287 μs | 0.95 | 0.06 |
| | | | | | |
| | |
| Write1Kb | .NET 7.0 | .NET 7.0 | 4096 | 29.20 μs | 0.479 μs |
0.425 μs | 1.00 | 0.00 |
| Write1Kb | .NET 8.0 | .NET 8.0 | 4096 | 4,813.45 μs | 95.872 μs |
214.431 μs | 164.20 | 7.41 |
| | | | | | |
| | |
| Write2Kb | .NET 7.0 | .NET 7.0 | 4096 | 27.79 μs | 0.549 μs |
1.018 μs | 1.00 | 0.00 |
| Write2Kb | .NET 8.0 | .NET 8.0 | 4096 | 5,037.09 μs | 91.438 μs |
122.067 μs | 182.70 | 8.50 |
| | | | | | |
| | |
| Write4Kb | .NET 7.0 | .NET 7.0 | 4096 | 4,860.28 μs | 96.641 μs |
203.848 μs | 1.00 | 0.00 |
| Write4Kb | .NET 8.0 | .NET 8.0 | 4096 | 5,110.86 μs | 94.640 μs |
92.949 μs | 1.04 | 0.03 |
| | | | | | |
| | |
| Write512Kb | .NET 7.0 | .NET 7.0 | 4096 | 5,038.07 μs | 100.634 μs |
272.069 μs | 1.00 | 0.00 |
| Write512Kb | .NET 8.0 | .NET 8.0 | 4096 | 5,340.02 μs | 105.455 μs |
217.782 μs | 1.08 | 0.08 |
| | | | | | |
| | |
| Write1Kb | .NET 7.0 | .NET 7.0 | 16384 | 28.26 μs | 0.295 μs |
0.261 μs | 1.00 | 0.00 |
| Write1Kb | .NET 8.0 | .NET 8.0 | 16384 | 4,619.00 μs | 91.768 μs |
231.909 μs | 163.67 | 7.33 |
| | | | | | |
| | |
| Write2Kb | .NET 7.0 | .NET 7.0 | 16384 | 28.54 μs | 0.447 μs |
0.419 μs | 1.00 | 0.00 |
| Write2Kb | .NET 8.0 | .NET 8.0 | 16384 | 4,631.66 μs | 92.227 μs |
254.021 μs | 161.77 | 10.73 |
| | | | | | |
| | |
| Write4Kb | .NET 7.0 | .NET 7.0 | 16384 | 28.88 μs | 0.571 μs |
1.166 μs | 1.00 | 0.00 |
| Write4Kb | .NET 8.0 | .NET 8.0 | 16384 | 4,737.23 μs | 94.672 μs |
255.952 μs | 164.40 | 11.82 |
| | | | | | |
| | |
| Write512Kb | .NET 7.0 | .NET 7.0 | 16384 | 4,938.89 μs | 97.829 μs |
224.779 μs | 1.00 | 0.00 |
| Write512Kb | .NET 8.0 | .NET 8.0 | 16384 | 4,987.08 μs | 99.350 μs |
202.946 μs | 1.02 | 0.08 |
```
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