Hi Fatima --

All you need to do is simply configure your VM with more processors. Make sure your VMware Linux machine is "Powered Down" (i.e. not suspended). Then, in VMware, select your Linux machine (but don't power on) and choose "Settings". Goto "Processors and RAM". Under "Processors" you should see a drop down -- simply click and select the number of "Virtual Processors" to use. Your choices should be "1, 2, or 4". The number of virtual processors can only be a power of two. If you choose 2 (your best choice on a quad core machine), then you should make sure that your RAM is pushed up to at least 4GB, too.

Next time the VMware Linux machine boots up, it will think it's running on dual-core hardware and you should be able to run two separate subjects at the same time. This is of course provided that you have enough RAM configured for your VM. We recommend a *minimum* of 2GB per recon, so for two in parallel your VM should be configured for at least 4GB RAM.

Of course, to really get the most possible performance, you should probably go the dual boot route and install a native Linux. In such a case, even on a quad core machine, I'd only recommend running 3 jobs at a time. If you run 4 then you're going to be very little else on the machine while all the recons are running. Again, if you were to run 4 recons, your machine should have at least 8GB RAM.

HTH -=R

On Oct 28, 2009, at 04:10 , Ahmed, F, Me fahmed@sun.ac.za wrote:

Ok, I do have a quad-core computer, but as I said, my FS is running on an emulator, therefore it is not accessing all of my cores. If what you say is true and I can run 4 jobs simultaneously, then how would I go about in setting that up? Any ideas and help would be greatly appreciated!

Thanks

From: Woo-Suk, Tae [mailto:wstae@kangwon.ac.kr] Sent: 28 October 2009 09:56 To: fahmed@sun.ac.za Cc: freesurfer@nmr.mgh.harvard.edu Subject: Re: [Freesurfer] dual boot OS

No, you just need multi-core CPU. If you have quad core CPU, you can run 4 jobs simultaneously (over 4 jobs possible, but the run time will be needed more) in the multiple command terminals.

Best regard!

Woo-Suk, Tae Chucheon, Korea

--- Original Message --- From : "Ahmed, F, Me fahmed@sun.ac.za"fahmed@sun.ac.za To : "Freesurfer Mailing List"freesurfer@nmr.mgh.harvard.edu Date : 2009/10/28 수요일 오후 4:19:02 Subject : [Freesurfer] dual boot OS

Hello,

A quick question, if I wanted to run simultaneous recon-all jobs, would I have to install Linux as a dual boot operating system as opposed to what I currently have, which is an emulator?

Thanks, Fatima

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Rudolph Pienaar, M.Eng, D.Eng / email: rudolph@nmr.mgh.harvard.edu MGH/MIT/HMS Athinoula A. Martinos Center for Biomedical Imaging 149 (2301) 13th Street, Charlestown, MA 02129 USA