Sure - that all makes sense, thanks. Though note - I was referring not to
maximum swap size, but there's a separate point, which is that I think
that on some OS's there is a limit to the max size that a single process
can have, which I think may be 2GB on linux - I think there's ways to
change that.
Cheers.
On Mon, 11 Oct 2004, Denis Brown wrote:
> 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
> >
>
--
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
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