Print

Print


For what it's worth...

Bear in mind that you can set up multiple swap partitions or swap files
(each 2GB in size) and use them.   If I recall reading correctly, up to
eight partitions/files can be used to give the equivalent of 16GB under a
2.4 series kernel.   The 2.6 kernel may have expanded that.   I have never
had to set up systems that support more than a single swap partition so I
cannot speak from experience.

Best regards,
Denis


On Mon, 11 Oct 2004, Stephen Smith wrote:

> Hi. This is a very large dataset - you'll need quite a lot more swap
> probably - try 4GB (though you may have a problem with the 2GB process
> limit on linux if you need more than that - though I think you can
> change the kernel params to increase that?).
>
> Cheers.
>
>
> On Fri, 8 Oct 2004, Axel Thielscher wrote:
>
> > Hi - I try to analyze an EP image series created with AFNI using the
> > GLM-module of FSL. I used 3dAFNItoANALYZE provided by AFNI to transform the
> > EP BRIK to an 4D-Analyze-File. The size of this file is either around 630 MB
> > (voxel values stored as integer) or 1.3GB (voxel values stored as floating
> > point) and it contains 1280 volumes of one session.
> >
> > The analysis with FEAT doesn't work with either of the two files. More
> > specifically, the command
> > /usr/local/fsl/bin/film_gls -rn stats -noest filtered_func_data design.mat
> > 11.12 3201
> > fails and is apparently unable to read to file.
> >
> > My computer: Red Hat Linux 9, Intel P-4, 1GB RAM, 2GB swap space
> >
> > Does this problem stem from insufficient swap space? The analysis with AFNI
> > works fine, but I would be happy to use the more advanced features such as
> > prewhitening etc. provided by FSL. How much memory do you recommend for
> > input file sizes as quoted above?  Can this failure be caused by a different
> > problem?
> >
> > Thanks,
> > Axel
> >
>
>  Stephen M. Smith  DPhil
>  Associate Director, FMRIB and Analysis Research Coordinator
>
>  Oxford University Centre for Functional MRI of the Brain
>  John Radcliffe Hospital, Headington, Oxford OX3 9DU, UK
>  +44 (0) 1865 222726  (fax 222717)
>
>  [log in to unmask]  http://www.fmrib.ox.ac.uk/~steve
>