Alice Weekly Meeting: Software for Hardware Accelerators / PDP-SRC

Wednesday 12 Feb 2025, 10:00 → 11:30 Europe/Zurich

10:00 → 10:20 Discussion

Speakers: David Rohr (CERN), Giulio Eulisse (CERN)

10:20 → 10:25 Following up JIRA tickets

Speaker: Ernst Hellbar (CERN)

10:25 → 10:30 TPC ML Clustering

Speaker: Christian Sonnabend (CERN, Heidelberg University (DE))

10:30 → 10:35 ITS Tracking

Speaker: Matteo Concas (CERN)

ITS GPU tracking

• General priorities:
  • Focusing on porting all of what is possible on the device, extending the state of the art, and minimising computing on the host.
    • Tracking fully ported on GPU (#13907, #13899).
    • Moving vertexing routines to the externally managed memory system. -> WIP
• Next required developments:
  • Thrust allocator with external memory management -> possibly the most critical missing piece, to found a decent way of introducing it.
  • Asynchronous parallelisation in the tracklet finding, i.e. Multi-streaming for obvious parallelisations.
• Optimizations:
  • intelligent scheduling and multi-streaming can happen right after.
  • Kernel-level optimisations to be investigated.

TODO:

• • Reproducer for HIP bug on multi-threaded track fitting: no follow-up yet.
  • Fix possible execution issues and known discrepancies when using gpu-reco-workflow: no progress.

DCAFitterGPU

• Deterministic approach via using SMatrixGPU on the host, under particular configuration: no progress.

10:35 → 10:45 TPC Track Model Decoding on GPU

Speaker: Gabriele Cimador (Universita e INFN Trieste (IT))

10:45 → 10:55 Efficient Data Structures

Speaker: Dr Oliver Gregor Rietmann (CERN)