PVMGEANT - A PARALLEL SIMULATION CODE FOR THE CLAS DETECTOR AT CEBAF

Due to the need for extensive and detailed simulations of the CEBAF La rge Acceptance Spectrometer (CLAS), the Monte-Carlo code CLASGeant was transferred to a heterogeneous computing cluster and has been linked to the Parallel Virtual Machine (PVM) message-passing library. The res ulting simulation package, PvmGeant, achieves an almost linear speedup in physics-event simulation. This article describes modifications to the original GEANT code, its integration with PVM, and performance tes ts that were conducted at the computing cluster at The Supercomputing Computations Research Institute at Florida State University. Particula r attention has been given to measuring the effect of different data s tructures on the cost of network communication between nodes.