Hi - try increasing the amount of swap. Also, you could use lowres
versions of the images to get an approximate FLIRT transform, and use
this to initialise the highres final call to FLIRT (-init option),
and also using the -nosearch option - that should reduce time needed
if not RAM.
Cheers.
On 24 Jul 2009, at 14:22, Richard Green wrote:
> Hi,
>
> I'm using FLIRT to register two large images. I ran the registration
> in a
> script over night, each registration runs for about 3h30m at which
> point it
> is killed (I get something like ./runflirt.sh: line 4: 3423
> Killed). I
> assume this is due to there not being enough memory and looking at the
> memory use this does seem to be a peak.
>
> I've successfully run registrations at a low resolutions but it'd be
> nice to
> do the full resolution if only to compare the results for a few
> images.
>
> The images are nifti format, ~60MB compressed, ~440MB uncompressed,
> about
> 1000x1000x500, unsigned char 8bpp. I'm running 64bit Ubuntu with
> 3.8GB of
> RAM and 4.3GB of swap.
>
> Are you able to give me any indication how much memory is needed to
> register
> a given pair of images? Is there are hope running flirt when this
> much swap
> space is needed or will it be too slow?
>
> Thanks for any advice you can give,
> Richard Green
>
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Stephen M. Smith, Professor of Biomedical Engineering
Associate Director, Oxford University FMRIB Centre
FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK
+44 (0) 1865 222726 (fax 222717)
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