As we all know and love .NET does throw an IntegerOverflow exception every time an integer overflows. I think this is a very good thing. But I wonder how they make this fast. x86 does not trap on integer overflows and I would be surprised if other architectures would allow one to do that. The best solution I have found for x86 is to put...
I've read that there is a jit compiler module for dalvik vm on the works and the results are quite promising. Some people claim an improvement of 100% in terms of execution speed. Does anyone have an idea when it is going to be incorporated in an android release? The amount of RAM on the nexus one (512MB) hints that a jit may be introduc...
By now, most mainstream browsers have started integrating optimizing JIT compilers to their JavaScript interpreters/virtual machines. That's good for everyone. Now, I'd be hard-pressed to know exactly which optimizations they do perform and how to best take advantage of them. Could anyone point me to references on optimizations in each o...
The following code gives different output when running the release inside Visual Studio, and running the release outside Visual Studio. I'm using Visual Studio 2008 and targeting .NET 3.5. I've also tried .NET 3.5 SP1. When running outside Visual Studio, the JIT should kick in. Either (a) there's something subtle going on with C# that I...
I've been thinking about it lately, and it seems to me that most advantages given to JIT compilation should more or less be attributed to the intermediate format instead, and that jitting in itself is not much of a good way to generate code. So these are the main pro-JIT compilation arguments I usually hear: Just-in-time compilation a...
I have a JAVA process that runs every day and takes about 1,000 or 2,000 hits before it is fully optimized by the JIT. What I'd like to do is save the JIT info so that the next day it can start in an optimized state. It seems like this should be possible, but I have not been able to find any method for doing so. ...
Q1) Why is C# initially compiled to IL and then at runtime JIT complied and run on top of a virtual machine(?). Or is it JIT complied to native machine code? Q2) If the second is true (JIT complied to native machine code), then where is the .NET sandbox the code runs under? Q3) In addition, why is the code compiled to IL in the first ...
I recently learned about scenarios which require warming up an app (with high throughput requirement) before they start serving real requests. The logic behind this was to allow JIT to do its performance magic! Is this a norm for Java apps or is this generally done for memory heavy (footprint) apps? ...
I've been poking around mscorlib to see how the generic collection optimized their enumerators and I stumbled on this: // in List<T>.Enumerator<T> public bool MoveNext() { List<T> list = this.list; if ((this.version == list._version) && (this.index < list._size)) { this.current = list._items[this.index]; this...
I've come across an intriguing problem. I have an application made of several assemblies. I installed the application but forgot one small non essential assembly. The application appeared to start and work fine until I hit a method that required the use of that assembly. As you might've already guessed I see the "Could not load file or a...
While trying to reproduce a reported problem with a managed nt-service, I've noticed that the performance counter "# of Methods Jitted" is constantly increasing (together with "# of IL Bytes Jitted"). The reported behavior consists of taking alot of memory (not necessarily everything available on the machine) and consuming 100% cpu. Requ...
Since so there are so many JIT implementation out there, every JIT emits native code. Then why hasn't someone made a tool like JIT2EXE, to save the native code to a native executable? ...
I have a game code (from ioquake3 project) that compiles part of gameplay binaries on the fly (the qvm system). Now, one could potentially speed it up by loading previously saved binaries of this operation (with any change-of-files precautions in place). But, pointers to functions saved in these binaries are not persistent through sess...
When I read about the performance of JITted languages like C# or Java, authors usually say that they should/could theoretically outperform many native-compiled applications. The theory being that native applications are usually just compiled for a processor family (like x86), so the compiler cannot make certain optimizations as they may...
Hi, How can I have a trace of native code generated by the JIT-Compiler ? Thanks ...
What are the differences between a Just-in-Time-Compiler and an Interpreter, and are there differences between the .NET and the JAVA JIT compiler? ...
I'm clear on the usage of MemoryBarrier, but not on what happens behind the scenes in the runtime. Can anyone give a good explanation of what goes on? ...
I know Microsoft .NET uses the CLR as a JIT compiler while Java has the Hotspot. What Are the differences between them? ...
Hi all, Is it possible to compile a .cs directly in x86 code ? I mean, I want to observe what happened with IDA Pro, so I didn't want IL code but asm code. Thanks ...
I've testing some new CLR 4.0 behavior in method inlining (cross-assembly inlining) and found some strage results: Assembly ClassLib.dll: using System.Diagnostics; using System; using System.Reflection; using System.Security; using System.Runtime.CompilerServices; namespace ClassLib { public static class A { static readonly Me...