What's in NetFX 3.5 SP1?

Long time, no blog.

 

Since the NetFX 3.5 Service Pack is available, now, I figured I’d put up a quick rundown of what we (the CLR CodeGen team) contributed to the package. I’m not going into nitty-gritty details, but just to give you an idea of what’s in it, and perhaps inspire you to go install it. A quick note: Unless otherwise noted, all changes impact both x86 & x64.

 

NGen infrastructure rewrite: the new infrastructure uses less memory, produces less fragmented NGen images with much better locality, and does so in dramatically less time. What this means to you: Installing or servicing an NGen image is much faster, and cold startup time of your NGen’ed code is better.

 

Framework Startup Performance Improvements: The framework is now better optimized for startup. We’ve tweaked the framework to consider more scenarios for startup, and now layout both code & data in the framework’s NGen images more optimally. What this means to you: Even your JIT code starts faster!

 

Better OS citizenship: We’ve modified NGen to produce images that are ASLR capable, in an effort to decrease potential security attack surface area. We’ve also started generating stacks that are always walkable using EBP-chaining for x86. What this means to you: Stack traces are more consistent, and NGen images aren’t as easily used to attack the system.

 

Better 32-bit code quality: The x86 JIT has dramatically improved inlining heuristics that result in generally better code quality, and, in particular, much lower “cost of abstraction”. If you want to author a data type that only manipulates a single integer, you can wrap the thing in a struct, and expect similar performance to code that explicitly uses an integer. There have also been some improvements to the ‘assertion propagation’ portion of the JIT, which means better null/range check elimination, as well as better constant propagation, and slight better ‘smarts’ in the JIT optimizer, overall. What this means to you: Your managed code should run slightly faster (and sometimes dramatically faster!). Note to 64 bit junkies: We’re working on getting x64 there, too. The work just wasn’t quite there in time.

 

Anyway, go forth & download!

 

-Kev

Comments

• Anonymous
  August 16, 2008
  The comment has been removed
• Anonymous
  August 16, 2008
  Badar: it is described at the "inlining heuristics" link."wrap the thing in a struct, expect similar performance to code that explicitly uses an integer"So far as it isn't a class field, right (based on your last post)? Or has this changed?
• Anonymous
  September 07, 2008
  Below is a list of all the sweet improvements made to the .NET Framework 3.5 Service Pack 1 since the
• Anonymous
  September 11, 2008
  【原文地址】 CLR Updates in .NET Framework 3.5 SP1 【原文发表日期】 19 August 08 07:57 Kevin Frie ，CLR核心部分的开发主管最近发布了一篇帖子