eladmarg commented on issue #933:
URL: https://github.com/apache/lucenenet/issues/933#issuecomment-2016711071
just for curiosity, (after i changed the FileStream) - the problem was gone
on 8,
but seems like on 9 Microsoft also has some performance degragation.
```csharp
BenchmarkDotNet v0.13.12, Windows 11
(10.0.22631.3296/23H2/2023Update/SunValley3)
AMD Ryzen Threadripper 3970X, 1 CPU, 16 logical and 16 physical cores
.NET SDK 9.0.100-preview.2.24157.14
[Host] : .NET 8.0.3 (8.0.324.11423), X64 RyuJIT AVX2
.NET 8.0 : .NET 8.0.3 (8.0.324.11423), X64 RyuJIT AVX2
.NET 9.0 : .NET 9.0.0 (9.0.24.12805), X64 RyuJIT AVX2
Server=True
| Method | Job | Runtime | Mean | Error | StdDev |
Median | Ratio | RatioSD |
|------------ |--------- |---------
|-----------:|-----------:|-----------:|-----------:|------:|--------:|
| Write1Kb | .NET 8.0 | .NET 8.0 | 4.970 ms | 0.3795 ms | 1.1130 ms |
4.857 ms | 1.00 | 0.00 |
| Write1Kb | .NET 9.0 | .NET 9.0 | 10.373 ms | 0.7447 ms | 2.1839 ms |
10.273 ms | 2.20 | 0.70 |
| | | | | | |
| | |
| Write2Kb | .NET 8.0 | .NET 8.0 | 4.566 ms | 0.3104 ms | 0.9105 ms |
4.601 ms | 1.00 | 0.00 |
| Write2Kb | .NET 9.0 | .NET 9.0 | 9.956 ms | 1.2714 ms | 3.7486 ms |
8.913 ms | 2.21 | 0.82 |
| | | | | | |
| | |
| Write4Kb | .NET 8.0 | .NET 8.0 | 4.340 ms | 0.3761 ms | 1.0970 ms |
4.229 ms | 1.00 | 0.00 |
| Write4Kb | .NET 9.0 | .NET 9.0 | 12.500 ms | 0.8261 ms | 2.3835 ms |
12.313 ms | 3.09 | 0.98 |
| | | | | | |
| | |
| Write512Kb | .NET 8.0 | .NET 8.0 | 11.235 ms | 0.7612 ms | 2.2205 ms |
10.852 ms | 1.00 | 0.00 |
| Write512Kb | .NET 9.0 | .NET 9.0 | 40.424 ms | 3.9548 ms | 11.6608 ms |
36.904 ms | 3.90 | 1.77 |
| | | | | | |
| | |
| Write1024Kb | .NET 8.0 | .NET 8.0 | 14.783 ms | 0.6947 ms | 2.0484 ms |
14.620 ms | 1.00 | 0.00 |
| Write1024Kb | .NET 9.0 | .NET 9.0 | 52.843 ms | 1.4089 ms | 4.1321 ms |
53.069 ms | 3.64 | 0.60 |
| | | | | | |
| | |
| Write16Mb | .NET 8.0 | .NET 8.0 | 724.461 ms | 14.1549 ms | 20.7481 ms |
726.672 ms | 1.00 | 0.00 |
| Write16Mb | .NET 9.0 | .NET 9.0 | 529.327 ms | 10.2676 ms | 15.9854 ms |
528.721 ms | 0.73 | 0.03 |
```
so, after all - this isn't a lucenenet issue, its only Microsoft bug.
this issue can be closed.
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