[Gate-users] Segmentation errors when using multiprocessing on a CPU cluster

[Triltsch, Nicolas]

Hello everyone,

I use a python multiprocessing script to run 1201 CT projections on a 64 
core CPU cluster. I run 64 processes (CT projections) on the cluster in 
parallel. One process could look like this:

*"Gate -a [rot_angle,8.9925062448][run_id,30] mac/ffdCT.mac"*

But for some projections the simulation crashes and I obtain a 
segmentation fault error. I restarted the failed projections with only 
32 parallel processes (still on the 64 core cluster) and they ran 
through without errors.

Can anyone of you explain this strange behavior?

Details of my simulation:
- Fixed forced detection actor
- 10**5 photons
- histogram spectrum
- Nested parameterization
- cone beam setup
- 64x64 resolution for the detector
- 64x64x64 volume

I am grateful for any help!
Nico

-- 
B.Sc. Nicolas Triltsch
Masterand

Technische Universität München
Physik-Department
Lehrstuhl für Biomedizinische Physik E17

James-Franck-Straße 1
85748 Garching b. München

Tel: +49 89 289 12591

nicolas.triltsch at tum.de
www.e17.ph.tum.de

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