[Gate-users] problem with gjm

[Simon Stute]

Hi Peter,

When you talk about fluctuations in the number of singles for each "block",
do you mean split macros (in the meaning of a job) or do you physically mean
a block in your detector ?
In the first case, did you use the following command in your main macro

/gate/cluster/setTimeSplitHalflife

Because if you did not use it, each split is equally divided along the
simulation time, so depending on the half-life of your isotope each split
will contain a different number of singles.

Hope this helps !
Simon

On Thu, Mar 4, 2010 at 3:40 PM, Peter Herrick <pdeh2 at cam.ac.uk> wrote:

> Dear GATE users,
>
> I have been using version 4.0  with linux in a cluster arrangement to
> simulate a PET scanner. I have found that the fluctuations in the number of
> singles events for each block are MUCH greater than those expected from
> poisson statistics - After looking at the seeds created when I employ gjs,
> the same numbers are appearing in each 'seed.rndm' file in different orders.
> To solve I have tried switching back to the HepJamesRandom engine, but as a
> result the Job merger is no longer working - I wondered if anyone has any
> ideas?
>
> The change that I implemented was the one Simon suggests in the thread
> 'same running on Gate' which can be found below.
>
>
> http://lists.opengatecollaboration.org/mailman/private/gate-users/2009-April/subject.html
>
> but there is no mention of gjm not working. The error I recieve is:
>
>
>  *** Break *** segmentation violation
> (no debugging symbols found)
> Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
> Attaching to program: /proc/17367/exe, process 17367
> done.
> Failed to read a valid object file image from memory.
> 0xb7f95410 in ?? ()
>
> which I have never seen before. Any help or suggestions would be much
> appreciated.
>
> Thanks,
>
> Peter Herrick,
> Wolfson Brain Imaging Centre
> University of Cambridge
>
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