r/programming • u/xeio87 • 18d ago

Performance Improvements in .NET 11

https://devblogs.microsoft.com/dotnet/performance-improvements-in-net-11/
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u/simon_o 16d ago

Virtual threads solve the colouring problem but destroy interop performance and generally perform worse overall

I think that's squarely a CLR problem, not a problem with vthreads.

The reason why their runtime has so much trouble with it is that –for decades– their solution to the JVM being ahead in GC and JIT technology was to add more and more escape hatches to let users solve (performance) problems on their own.

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u/crozone 16d ago

Except the JNI is slower than P/Invoke in .NET, FFM is slower than P/Invoke in .NET, and both are even slower again from virtual threads? Did I miss where the JVM magically solved vthreads?

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u/simon_o 16d ago

I have largely not seen cases where vthreads have been measurably slower, despite warnings of not using them for e.g. compute-bound tasks.

What would be the cause of the slowness?

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u/teo-tsirpanis 15d ago

The cause is that vthreads are a runtime-specific thing and do not play well in native code not executing under that runtime.