Chroma Issues

EXECUTIVE SUMMARIES ONLY

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• brief overviews of activities
• KEEP IT BRIEF : LINK TO INVESTIGATIONS/NOTES ON OTHER PAGES

Chroma CUDA Instability, GPU Panics

• Chroma CUDA Freeze

Potential solutions:

• improve pycuda error handling PyCUDA Error Handling
• reduce work done by each kernel, maybe tweaking nblocks etc..
• operate headlessly in console mode to avoid GPU timeouts

Chroma Camera is uncontrollable

• on rotating around, flip into other positions (maybe gimbal lock)

Chroma Surface model mismatch G4LogicalBoundarySurface

G4LogicalBoundarySurface uses a pair of ordered PVs, so the surface is only relevent when stepping in from one direction and not the other.

Chroma has only a single 8 bits for a surface index attached to each triangle. Solution may be to expand that to 2*8 bits.