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Processor speed selection, vurtial machines

Posted on 2008-02-05
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As Vista looms, we need to start testing our software on the OS.  I want to do this in virtual machines (MS Virtual PS, Virtual Box, VMWare), but I have very specific requirements.  All of the virtual PCs that I have tried will allow you to change system RAM, video ram and HDD space, but not processor speed.  I need to test the ability of Vista to run on different processors and the impact of perfomance on the applications.  

Does this type of software currently exist?  What are my options.  Has anyone else done something similar?
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Question by:s2welee
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arndawg earned 1000 total points
ID: 20825997
Hi. Vmware only let's you choose number of processors / cores.

But there is a way to do it. You can limit the vmware process.

Check out: http://deztec.jp/x/05/faireal/BES-index.html

Download: http://mion.faireal.net/archive/bes1.0b5.zip
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by:Mevi
Mevi earned 1000 total points
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Please note, when you are testing in a virtual machine environment you will NOT have accurate results for performance.  There is a performance hit when operating inside a virtual machine, regardless of whether or not you are using the intel-V or amd-vt technology.  Please keep this in mind when doing your testing.
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by:s2welee
ID: 20840309
Thanks for the tips.  The testing is mainly to see if the code will run and if it is feesable on the hardware for our equipment.  I would rather err on the side of too slow than too fast.  Are there any options outside of VMWare that you all know of?  
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by:Mevi
ID: 20842574
Most of the virtualization technologies have the same limitations as far as performance.  

There are a few cpu "limiters" for windows that were used to help compatibility with old games.  you should be able to find them on google.

Also note that I will say Vista itself in a VM is extremely different than on physical hardware, due to things like superfetch, hard drive speeds, etc.

Good luck!
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