CERN Accelerating science

Plan 2008

Submitted by Anonymous (not verified) on Wed, 06/28/2017 - 11:24
Run. Event and Detector Response WG

Work plan 2008

1] Parallel navigation

- Finalize
- Co-work with Geometry and Generic Processes WGs

2] Command-based scoring

- Finalize box mesh
- Introduce / finalize cylindrical mesh

3] Prototype multi-core extension of Geant4

Gene Cooperman and his student, Xin Dong, developed a prototype
thread-parallel version of Geant4 (event-level parallelism)
to take advantage of multi-core processors.

In this prototype all global data is made thread-local (thread-private).
Future work will concentrate on enhancing the spatial locality of
the code to better use the limited cache.

Two opportunities for this are:
(1) selectively allowing the larger data structures to be shared instead
of thread-local; and
(2) coordinating threads to use the same Geant4 code at the same time
(for example, to prioritize processing of tracks concerned with
a particular particle first).
Other advantages are the ability to parallelize slow initialization
code, and the potential for fine-grained track-level parallelism.