question regarding 64-bit processing

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Junaid - 13 May 2004 02:38 GMT

Here's something I was pondering earlier:

There's a 64-bit version of Windows XP that is supposed to work with
AMD 64-bit processors. Now, the huge task of migrating unmanaged code
to 64-bit would be monumental (I'm guessing). But given that .NET code
isn't natively compiled, rather it gets jitted .. am I to conclude
that a 64-bit Windows XP running on a 64-bit AMD processor with the
.NET framework would run .NET application "out-of-the-box" and provide
all the benefits of running on a 64-bit processor?

I would appreciate it if someone could shed some light on this as it
seems to be a rather interesting aspect of the .NET framework.

Cheers

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Junfeng Zhang[MSFT] - 13 May 2004 06:15 GMT

This is mostly true, except a few things to watch, like P/Invoke, COM
interop.

You can watch Chris Brown's MSDN TV show about 64 bit CLR and .net framework
here
http://msdn.microsoft.com/msdntv/episode.aspx?xml=episodes/en/20030731CLRCB/mani
fest.xml

Chris also had a slide for 64 bit, and can be found here
http://www.route64.net/slidedecks/MBuildingPortingDebuggingWhidbey64.ppt

Hope this helps.

Signature

Junfeng Zhang
http://weblogs.asp.net/junfeng [English]
http://blog.joycode.com/junfeng [Chinese]

> Here's something I was pondering earlier:
>
[quoted text clipped - 10 lines]
>
> Cheers

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Ice - 17 May 2004 14:17 GMT

How is this true pre-Whidbey? To understanding, the app will run but in 32
bit mode.

ice

> This is mostly true, except a few things to watch, like P/Invoke, COM
> interop.
>
> You can watch Chris Brown's MSDN TV show about 64 bit CLR and .net framework
> here

http://msdn.microsoft.com/msdntv/episode.aspx?xml=episodes/en/20030731CLRCB/mani
fest.xml

> Chris also had a slide for 64 bit, and can be found here
> http://www.route64.net/slidedecks/MBuildingPortingDebuggingWhidbey64.ppt
[quoted text clipped - 15 lines]
> >
> > Cheers

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Brad Wilson - 17 May 2004 18:55 GMT

> How is this true pre-Whidbey? To understanding, the app will run but in 32
> bit mode.

You're right... they're talking about the 64-bit CLR that will be
released as part of Whidbey. It's available in alpha form today.

--
Brad Wilson
http://www.dotnetdevs.com/

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"Jeff Schwartz [MSFT]" - 18 May 2004 00:05 GMT

Pre-Whidbey releases are X86 only, and are not supported on Win64 OSs.

Going forward pre-whidbey assemblies will likely load as WOW processes and
run on the CLR32. If the assembly is recompiled as agnostic using Whidbey
tools it will run as a native 64bit process.

Hope that this clarifys things a bit.

Jeff

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question regarding 64-bit processing

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