alternatively you could split the image with the seedmask in it so as
to contain different sets of seed voxels in different images and then
run them all in parallel.
Cheers.
On 31 Aug 2007, at 19:57, Matt Glasser wrote:
> Tim,
>
> The outputs are identical. Thank you for pointing that out. Maybe
> a future
> version could support parallelization in this way?
>
> Peace,
>
> Matt.
>
> -----Original Message-----
> From: FSL - FMRIB's Software Library [mailto:[log in to unmask]] On
> Behalf
> Of Tim Behrens
> Sent: Friday, August 31, 2007 12:18 PM
> To: [log in to unmask]
> Subject: Re: [FSL] Parallelise probtrackx
>
> Matt - I know this should work, but you might want to check whether
> it actually does - it is possible that the random seed is fixed at
> the beginning of the program, so all of your different processes
> would give you identical outputs.
>
> T
>
>
>
> On 31 Aug 2007, at 12:41, Matt Glasser wrote:
>
>> Also, you could split up the number of samples e.g. if you normally
>> track
>> with 25000 and have five processors, you could track 5 times with
>> 5000
>> samples and add the result. This method is easier if you know a
>> little
>> shell scripting.
>>
>> -----Original Message-----
>> From: FSL - FMRIB's Software Library [mailto:[log in to unmask]] On
>> Behalf
>> Of Tim Behrens
>> Sent: Friday, August 31, 2007 5:39 AM
>> To: [log in to unmask]
>> Subject: Re: [FSL] Parallelise probtrackx
>>
>> Just split your seed mask into as many masks as you have processors,
>> set them off independently, and add up the answers at the end.
>>
>> Cheers
>>
>> T
>> On 31 Aug 2007, at 09:25, Ravi Shetty wrote:
>>
>>> I know it is possible to parallelise bedpostx but is it also
>>> possible to parallelise probtrackx? If so is it
>>> done using the same method? Thanks.
>>>
>>> -Ravi
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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)
[log in to unmask] http://www.fmrib.ox.ac.uk/~steve
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