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Hi, Matt. Thanks for your replying! Kenji --- Matt Glasser <[log in to unmask]> wrote: > That's true, you need a lot of RAM for this to work. > There isn't a way to multithread probtrackx with only a single copy of > the info in the RAM. The diffusion samples are what take up the most memory > in most probtrackx instances. You can reduce memory usage by cropping > the diffusion volume to not include any empty space around the > nodif_brain_mask. > > Peace, > > Matt. > > -----Original Message----- > From: FSL - FMRIB's Software Library > [mailto:[log in to unmask]] On Behalf > Of Kenji > Sent: Wednesday, June 23, 2010 6:05 AM > To: [log in to unmask] > Subject: Re: [FSL] Probtrackx on SGE > > Hi, > > Thanks Matt. > > >2) If you have individual pathways that take longer > to track, launch > several probtrackx processes with fractions > > of the total number of samples you want to track > and different --rseed > values. > > In your method described, probtrackx needs many RAM > because of reading merged_th, ph, f . > Do you have plan that probtrackx allows single mask > to parallelize tracking in order to speed up processing ? > i.e. probtrackx splits number of seed voxels into > number of threads and tracks from divided seeds independently. > > Thanks > Kenji > > > ----- Original Message ----- > From: "Matt Glasser" <[log in to unmask]> > To: <[log in to unmask]> > Sent: Tuesday, June 22, 2010 12:00 AM > Subject: Re: [FSL] Probtrackx on SGE > > > > You can already paralellize probtrackx in several > ways. 1) if you have many subjects or pathways to track, submit each to SGE > using fsl_sub. 2) If you have individual pathways that take longer to track, launch several > > probtrackx processes with fractions of the total number of samples you want > > to track and different --rseed values. > > > > Peace, > > > > Matt. > > > > -----Original Message----- > > From: FSL - FMRIB's Software Library > [mailto:[log in to unmask]] On Behalf > > Of Kenji > > Sent: Monday, June 21, 2010 1:36 AM > > To: [log in to unmask] > > Subject: [FSL] Probtrackx on SGE > > > > Hi, > > > > When is ProbtrackX set up to be parallelized ? > 4.1.6 ? > > > > Thanks > > Kenji > > >