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Questions tagged [ryujit]

The next-generation JIT compiler for .NET

A new, next-generation x64 JIT compiler that compiles code twice as fast is ready to change your impressions of 64-bit .NET code

Why ryujit? The 64-bit JIT currently in .NET isn’t always fast to compile your code, meaning you have to rely on other technologies such as NGen or background JIT to achieve fast program startup.

This new JIT is twice as fast, meaning apps compiled with RyuJIT start up to 30% faster (Time spent in the JIT compiler is only one component of startup time, so the app doesn’t start twice as fast just because the JIT is twice as fast.) Moreover, the new JIT still produces great code that runs efficiently throughout the long run of a server process.

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RyuJit producing incorrect results

After recently upgrading to .net 4.6 we discovered a bug where RyuJit produces incorrect results, we were able to work around the issue for now by adding useLegacyJit enabled="true" to the app.config. How can I debug the machine code generated by…
BrandonAGr
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What's the difference between RyuJIT and Roslyn?

I understand that RyuJIT is a quicker compiler than JIT. But is it the new standard for the .NET 4.6 or is that Roslyn? Or is it that Roslyn is used when you need to expose APIs during the compilation process? I'm confused between their purposes…
myfunnyfella
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What is new .Net Native

Today I have read an article about the new .Net Native on MSDN. "Windows Store apps start up to 60% faster with .NET Native and have a much smaller memory footprint. Our first release is a Developer Preview that allows you to develop and test…
Vimal CK
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Expensive to wrap System.Numerics.VectorX - why?

TL;DR: Why is wrapping the System.Numerics.Vectors type expensive, and is there anything I can do about it? Consider the following piece of code: [MethodImpl(MethodImplOptions.NoInlining)] private static long GetIt(long a, long b) { var x =…
Krumelur
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Under what conditions does the .NET JIT compiler perform automatic vectorization?

Does the new RyuJIT compiler ever generate vector (SIMD) CPU instructions, and when? Side note: The System.Numerics namespace contains types that allow explicit use of Vector operations which may or may not generate SIMD instructions depending on…
redcalx
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How do I verify that ryujit is jitting my app?

I've installed the new Jit compiler for .NET RyuJit, and setup the AltJit=* key in .NetFramework in regedit as described in the installation docs. http://blogs.msdn.com/b/dotnet/archive/2013/09/30/ryujit-the-next-generation-jit-compiler.aspx So how…
Roger Johansson
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RyuJIT not making full use of SIMD intrinsics

I'm running some C# code that uses System.Numerics.Vector but as far as I can tell I'm not getting the full benefit of SIMD intrinsics. I'm using Visual Studio Community 2015 with Update 1, and my clrjit.dll is v4.6.1063.1. I'm running on an…
eoinmullan
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Enabling RyuJIT in Visual Studio 2015 RC

After installing Visual Studio 2015 RC1, I have loaded a legacy ASP.NET project and changed the .NET version to 4.6. The project works fine, but the website still loads as slow as always. I was expecting RyuJIT to kick in, but apparently it is…
Adrian Grigore
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Do I need to target my application to .NET 4.6 to take advantage of RyuJIT?

Reading from Announcing .NET Framework 4.6 it seems to imply that RyuJIT is only for .NET 4.6. Does that means I will need to re-target my applications to .NET 4.6 for RyuJIT to take effect?
Rosdi Kasim
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.NET 4.6 RC x64 is twice as slow as x86 (release version)

Net 4.6 RC x64 is twice as slow as x86 (release version): Consider this piece of code: class SpectralNorm { public static void Main(String[] args) { int n = 5500; if (args.Length > 0) n = Int32.Parse(args[0]); var…
Bijan
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RyuJIT C# wrong sum result with /optimize

I've this piece of code: private void AnswerToCe(int currentBlock, int totalBlock = 0) { byte[] bufferToSend; byte[] macDst = mac; byte[] macSrc = ConnectionManager.SInstance.GetMyMAC(); byte[] ethType; byte[] header; if…
rmbq
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Why does Mono run a simple method slower whereas RyuJIT runs it significantly faster?

I created a simple benchmark out of curiosity, but cannot explain the results. As benchmark data, I prepared an array of structs with some random values. The preparation phase is not benchmarked: struct Val { public float val; public float…
dymanoid
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What are these extra disassembly instructions when using SIMD intrinsics?

I'm testing what sort of speedup I can get from using SIMD instructions with RyuJIT and I'm seeing some disassembly instructions that I don't expect. I'm basing the code on this blog post from the RyuJIT team's Kevin Frei, and a related post here.…
eoinmullan
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Is a struct wrapping a primitive value type a zero cost abstraction in C#?

Sometimes I want to add more typesafety around raw doubles. One idea that comes up a lot would be adding unit information with the types. For example, struct AngleRadians { public readonly double Value; /* Constructor, casting operator to…
Zachary Burns
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Slow execution under 64 bits. Possible RyuJIT bug?

I have the following C# code trying to benchmark under release mode: using System; using System.Collections.Generic; using System.Diagnostics; using System.Linq; using System.Text; using System.Threading.Tasks; namespace…
Onur Gumus
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