Ph4 gpu capable in handling test particles #1207
Description
Is your feature request related to a problem? Please describe.
It would be nice if the gpu version of Ph4 can handle test particles.
Describe the solution you’d like
Support for test particles in the GPU version of Ph4, such that massless particles are excluded from the source (j) interaction loop while still allowing them to receive accelerations as targets (i).
Describe alternatives you've considered
I've tried adding a mass condition within the dev_evaluate_gravity.cu file akin to that in the CPU version of Ph4, but no speed-up is found. As a result, I think most of the heavy work goes into synchronisation of states or building the arrays. I could look into it, but given my lack of knowledge revolving gpu codes, I would be very happy if someone with more experience could tackle it.