> This is (done at install time) because ngen is optimized for processor > and OS.
I think there needs to be an "in theory" caveat in there somewhere. How many different CPU/OS families does the .NET JIT compiler actually support discretely? And does it really make a difference anyway? Delphi code compiled for "generic x86 processors" still seems able to run circles around C# code. Part of that will be that it's not just a question of "code", but also framework semantics that affect performance. Moving bytes around and manipulating them is likely to be just as fast as native code, but invoking methods and even simple things like type-casting will incurr overhead that the managed runtime imposes to ensure that the code isn't doing something it shouldn't. Someone did some benchmarking not so long ago where the test conditions were set by some C# guys - it was essentially an open benchmarking challenge with invitations to submit optimal solutions in various languages. I forget the details but the last I heard the C# code struggled to get anywhere near the Delphi code. I wish I could remember a link to it - it made for interesting reading generally. It was someone's blog I think. Can anyone help out with a reference? > NGen means the resultant assembly is faster. I thought it mostly affected apparent loading time, since all assemblies are "compiled" before executing. NGen allows this compilation "hit" to be incurred during installation (or even prior to distribution) rather than during startup, but once loaded the assembly won't be faster per se. As for why NGen isn't popular, that might be because there are so many things that can cause the resultant compiled assembly images to become invalid, which presumably negates the benefit. http://msdn.microsoft.com/en-us/library/6t9t5wcf(VS.71).aspx _______________________________________________ NZ Borland Developers Group - Delphi mailing list Post: delphi@delphi.org.nz Admin: http://delphi.org.nz/mailman/listinfo/delphi Unsubscribe: send an email to delphi-requ...@delphi.org.nz with Subject: unsubscribe
