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Dual Core CPU allocation in Parallels/Boot Camp
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Fresh-Faced Recruit
Join Date: Aug 2008
Location: NYC
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I won't lie. The reason I got this iMac is partly because it's intel and I can Boot Camp Windows on it. I also got Parallels for the less resource intensive apps. But the more I use OS X the more I never want to turn back to Windows unless I absolutely have to. Using Procoder is one of those reasons. I set Parallels to take precedence when I run it and it has half of my 4GB of RAM (the maximum) apportioned to it. System, properties in Windows says the machine indeed has 2G of RAM, but it tells me nothing of the CPU allocation. I was just curious if there were any other heretic Parallels users out there who knew what the scoop is on this. Also, what the true hardware specs on Boot Camp are for an iMac 3.06Ghz, Nvidia 8800, 4GB RAM. Thanks
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Professional Poster
Join Date: Mar 2002
Location: Boston
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The last time I used parallels it only had the ability to use one cpu, no option for changing that. I'm not sure if that is still the case but VMWare's Fusion does allow the use of both cpus.
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Fresh-Faced Recruit
Join Date: Aug 2008
Location: NYC
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The machine sees the hardware as 2GB RAM and a 3.06 dual core, I was just wondering if there was a way too see what the actual usage was... CPU usage only gives a percentage total, and i don;t know if that's cumulative of both cores, or of one because Parallels only uses one. Does Fusion use both cores and not just see that that is the hardware it's stealing a core from?
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Posting Junkie
Join Date: Oct 2005
Location: Houston, TX
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Parallels Desktop for Mac doesn't support SMP for guests, so Windows only has access to a single core. The CPU available in Windows will be slightly slower than the same core in OS X due to virtualization overhead.
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Fresh-Faced Recruit
Join Date: May 2008
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Originally Posted by BreadRecipe 
Does Fusion use both cores and not just see that that is the hardware it's stealing a core from?
Yes, Fusion can use multiple cores (assuming the guest actually makes use of them) - you can check this in Activity Monitor. I'm not quite sure what you mean by "just see that that is the hardware it's stealing a core from?", but it's not just cosmetic.
Note that when you install Windows, it looks around and decides on a HAL, which differs for single-processor and multiprocessor systems (so you can't simply take a single-CPU Windows virtual machine, set it to two vCPUs, and have it work right away). You have to either change the HAL (officially unsupported by Microsoft in XP) or do a fresh install.
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