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Another possible explanation for why you get more CPU usage on a lesser machine is the balance of CPU demand vs. disk I/O demand. If the faster system happens to be idle half the time due to I/O time, and the slower system has a slower CPU but an equally fast disk, then the slower machine will be busy with CPU cycles proportionally more of the time and waiting for I/O proportionally less of the time. Greg Miller, U. Illinois, Champaign > Simona, > > Matlab is not a multi-threaded application, and consequently it can only > use half of the processor resources on a hyper-threading processor. If > you disable hyper-threading Matlab will be able to access more of the > processor resources. > > Jared Van Snellenberg > Laboratory for Affective & Developmental Neuroscience (www.sfu.ca/ladn) > Department of Psychology, Simon Fraser University > RCB 4209, 8888 University Drive, > Burnaby BC, Canada V5A 1S6 > Phone: 604-291-3013 > ----- Original Message ----- > From: Brambati, Simona > To: [log in to unmask] > Sent: Tuesday, March 08, 2005 3:36 PM > Subject: [SPM] Processor/CPU > > > Dear SPMers, > > I'm using a Precision Worstation 3.6GHz and 3.0 GB of RAM (DDR). The > Hard Drive is 140GB with 10GB remaining. Hyper-Threading is on. The > system is Microsoft Windows XP. > > When I run an estimation, I run into a very noticeable problem, > specifically on the second part of the analysis. The Processor/CPU usage > hangs at 50% and does not want to use anymore processor. I've run the > exact same analysis on a different and less powerful machine, and the > second stage not only shows quicker processing, but the CPU usage works > 90%-100%. > > What can I do to get my machine to work closer to 90-100% on the > analysis? > > Thanks, > > Regards, > > Simona Brambati