Change the HAL of Windows OS

I am doing a presentation on Visual Studio 2010/.net 4 parallel programming enhancements in the near future. [MS] released Visual Studio 2010 CTP and that’s fine. The problem was that the one and only release comes in the form of a VirtualPC image. This is not a problem by itself but it is a problem if one wants to show parallelism. You see, VirtualPC supports only single processor guests ([MS] isn’t exactly pushing for VirtualPC enhancements, is it – at the time [MS] bought VirtualPC it was on the same level as [VMWare] Workstation, now it is lightyears away). How can one show performance enhancements of parallelism with one CPU?

Part of the solution is [VMWare] Workstation 6.5 (and earlier, don’t know exactly which ones): it supports multiprocessor guests. Great. However once I’ve imported VirtualPC image into Workstation the OS was still showing only one processor even though device manager recognized two processors. Even updating the computer driver (node Computer\Advanced Configuration and Power Interface (ACPI) PC) didn’t help – there were no choices. Luckily I’ve googled over this blog post: Hyper-V How To: Change the HAL on your vm. Oh, the joy, the trick just worked.

The other problem with this presentation is that Visual Studio 2010 CTP expired by the end 2008. The solution is to change date backwards (silly, isn’t it) but Workstation/Windows keep synchronizing the time with current and thus yielding all sort of activation and expiration warnings. The solution is a twofold one:

- add these lines to Workstation’s configuration file so the Workstation won’t synchronize the guest on every occasion (thanks to Virtual Time Freeze):

tools.syncTime = "FALSE"
time.synchronize.continue = "FALSE"
time.synchronize.restore = "FALSE"
time.synchronize.resume.disk = "FALSE"
time.synchronize.shrink = "FALSE"

- remove or disable guest’s network capabilities so the OS won’t synchronize as well.

Ah, the joys of presentations based on CTPs.

Comments (3) -

  • Bojan Vrhovnik

    26.1.2009 8:51:52 | Reply

    Well, if ISO would be avaiable, you would certainly got it...but until, you must satisfy yourself with VPC... Smile

  • Peter

    26.1.2009 9:26:20 | Reply

    I think you can also port the VPC hard disk image to Hyper-V and then just turn off the time synchronization.

  • Miha Markic

    26.1.2009 10:06:04 | Reply

    @Peter: I could but I prefer Workstation, specially for its USB devices support and Snapshot Manager. But even if I'd used Hyper-V I'd face same issues I had to solve with Workstation.

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