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I don't know if you are doing the "adjustment" or not. If you are, then it is likely to slow the processing down considerably. Changing maxMem makes no difference to the realignment. I don't think that increasing swap will have any effect on speed, although it can prevent the occasional crash through lack of memory. Best regards, -John > Hello all,I have set up and compiled spm99 on our sgi o2s with matlab6. > We can get things to run, but they are incredibly slow...it can take 4-30 > hours to do realignment, for example....we are frustrated both by the > inconsistencies in time and the length of time it takes to do the > processing (the dataset is 264 reps and 19 slices-fMRI). > > We have fooled with the maxMem variable, and we have increased the swap > space to 1gb...given the inconsistencies, it is difficult to determine if > these changes have had any effect....but it looks like our problem > persists. -- Dr John Ashburner. Wellcome Department of Cognitive Neurology. 12 Queen Square, London WC1N 3BG, UK. tel: +44 (0)20 78337491 or +44 (0)20 78373611 x4381 fax: +44 (0)20 78131420 http://www.fil.ion.ucl.ac.uk/~john mail: [log in to unmask]