Comment Feed for Channel 9 - .NET 4.5 - Multicore JIT http://media.ch9.ms/ch9/5271/82c45062-4406-4b89-852c-854c64b45271/MulticoreJITNET45_100.jpg Channel 9 - .NET 4.5 - Multicore JIT Multicore JIT is a .NET 4.5 compiler technology that uses parallelization to reduce the JIT compilation time during application startup.Multicore JIT team says: "With Multicore JIT, methods are compiled on two cores in parallel. The more code you execute on your startup path, the more effective Multicore JIT will be at reducing startup time. Improvements of 20%-50% are very typical, which is great news to anyone developing medium to large .NET Framework applications that are not able to take advantage of NGen. You can improve the startup time of your application by up to 50% with very little work, even if it runs off of a USB stick."Who better to explain this than .NET Performance Architect Vance Morrison and Multicore JIT program manager Dan Taylor? They are joined by software engineer Rick Brewster from the Windows team to discuss how this technology works and why it matters. Rick works on a large .NET Windows desktop application and Multicore JIT has clearly sped up his app's startup time. We'll get the inside scoop from both those who designed the technology and those who use it in production. en Fri, 24 May 2013 00:15:16 GMT Fri, 24 May 2013 00:15:16 GMT Rev9 Re: .NET 4.5 - Multicore JIT posted by Florian Maetschke

]]> http://channel9.msdn.com/posts/NET-45-Multicore-JIT#c634861630599904145 Thu, 18 Oct 2012 13:17:39 GMT http://channel9.msdn.com/posts/NET-45-Multicore-JIT#c634861630599904145 Florian Maetschke Re: .NET 4.5 - Multicore JIT posted by radioman

]]> http://channel9.msdn.com/posts/NET-45-Multicore-JIT#c634861748976358783 Thu, 18 Oct 2012 16:34:57 GMT http://channel9.msdn.com/posts/NET-45-Multicore-JIT#c634861748976358783 radioman Re: .NET 4.5 - Multicore JIT Rick Brewster's post:
http://blog.getpaint.net/2012/09/08/using-multi-core-jit-from-net-4-0-if-net-4-5-is-installed/

posted by felix9

]]> http://channel9.msdn.com/posts/NET-45-Multicore-JIT#c634861750834970948 Thu, 18 Oct 2012 16:38:03 GMT http://channel9.msdn.com/posts/NET-45-Multicore-JIT#c634861750834970948 felix9 Re: .NET 4.5 - Multicore JIT Although this kind of improvments are certainly welcomed, what I really want is more optimized code gen, and I guess with MDIL the actual JIT has LESS work to do at app startup time, thats win-win.

posted by felix9

]]> http://channel9.msdn.com/posts/NET-45-Multicore-JIT#c634863182874145829 Sat, 20 Oct 2012 08:24:47 GMT http://channel9.msdn.com/posts/NET-45-Multicore-JIT#c634863182874145829 felix9 Re: .NET 4.5 - Multicore JIT I think they've got a slightly wrong/too damn conservative mindset here.  Sure jitting methods when their not needed may be a "waste" in terms of I want to flash deep fry this entire buffalo in 10 seconds flat. But I believe Jitting in chunks when they seem probable to be used is a far better way to go and cache the jitted methods for use later on, ambient CPU and RAM size is still growing...

A good analogy to this is the CPU's themselves, not like the CPU grabs a single friggin bit of data out of memory, the CPU's pull the data as cache-lines and chunks at a time for faster speeds even tho the data in the memory isn't all being used. Of course it causes things like false sharing and memory location contention when it's not done right but still, hardware went to grabbing more data than is needed in one go, I think that Vance shouldn't be so picky on being 100% efficient as if it were kernel space or if this code was used for lunar launches & space exploration. If he wants, why don't they just put in heuristics or hints to the CPU's so that CPU's can also be 98% efficient using/hinting to the branch prediction engines built into current CPU's and do their tracing to help it along?

posted by HeavensRevenge

]]> http://channel9.msdn.com/posts/NET-45-Multicore-JIT#c634863504328968529 Sat, 20 Oct 2012 17:20:32 GMT http://channel9.msdn.com/posts/NET-45-Multicore-JIT#c634863504328968529 HeavensRevenge Re: .NET 4.5 - Multicore JIT @Vance Morrison,

Could you please give us some ideas on how the performance of multicore .Net JIT compares to Java JIT on multicore?

Thanks,

Ivan

posted by ivan_

]]> http://channel9.msdn.com/posts/NET-45-Multicore-JIT#c634864249211477675 Sun, 21 Oct 2012 14:02:01 GMT http://channel9.msdn.com/posts/NET-45-Multicore-JIT#c634864249211477675 ivan_ Re: .NET 4.5 - Multicore JIT The implementation of the feature is pretty odd. I would've implemented it a bit differently. Some alternatives:

  1. Collect startup profiles automatically for each and every application.
  2. Run NGEN in the background when you launch a non-ngened app.

I see the benefits of the API but if you did it this way every single app would benefit from the Multicore JIT. Now only a few apps will benefit since most developers will never learn about all this cool technology. At least you could've managed the profile directory automatically...

In the video you talked about command line arguments. Most apps probably won't use command line arguments. And the developers caring about that scenario could still add calls to the current API.

It'd be great if you could elaborate more why you implemented the way it is.

posted by deiruch

]]> http://channel9.msdn.com/posts/NET-45-Multicore-JIT#c634864651811913750 Mon, 22 Oct 2012 01:13:01 GMT http://channel9.msdn.com/posts/NET-45-Multicore-JIT#c634864651811913750 deiruch Re: .NET 4.5 - Multicore JIT posted by ivan

]]> http://channel9.msdn.com/posts/NET-45-Multicore-JIT#c634864938911409868 Mon, 22 Oct 2012 09:11:31 GMT http://channel9.msdn.com/posts/NET-45-Multicore-JIT#c634864938911409868 ivan Re: .NET 4.5 - Multicore JIT @ivan: I consider your comment offensive and not to the point. I didn't say "code runs badly". I just want to know the performance difference between Java and .Net JIT .

 

posted by ivan_

]]> http://channel9.msdn.com/posts/NET-45-Multicore-JIT#c634865186216260883 Mon, 22 Oct 2012 16:03:41 GMT http://channel9.msdn.com/posts/NET-45-Multicore-JIT#c634865186216260883 ivan_ Re: .NET 4.5 - Multicore JIT Now, now... Keep it civil. Please don't be disrespectful of others, ivan...
C

posted by Charles

]]> http://channel9.msdn.com/posts/NET-45-Multicore-JIT#c634865249908115629 Mon, 22 Oct 2012 17:49:50 GMT http://channel9.msdn.com/posts/NET-45-Multicore-JIT#c634865249908115629 Charles Re: .NET 4.5 - Multicore JIT posted by jagvir

]]> http://channel9.msdn.com/posts/NET-45-Multicore-JIT#c634871794763442367 Tue, 30 Oct 2012 07:37:56 GMT http://channel9.msdn.com/posts/NET-45-Multicore-JIT#c634871794763442367 jagvir