Eur. Phys. J. C (2011) 71: 1703
https://doi.org/10.1140/epjc/s10052-011-1703-5

Special Article - Tools for Experiment and Theory

Thread-scalable evaluation of multi-jet observables

Theoretical Physics Department, Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL, 60510, USA

^* e-mail: jwinter@fnal.gov

Received: 10 June 2010
Revised: 3 June 2011
Published online: 12 July 2011

Abstract

We have implemented the leading-color n-gluon amplitudes using the Berends–Giele recursion relations on a multi-threaded GPU. Speed-up factors between 150 and 300 are obtained compared to the CPU-based implementation of the same event generator. In this first paper, we study the feasibility of a GPU-based event generator with an emphasis on the constraints imposed by the hardware. Some studies of Monte Carlo convergence and accuracy are presented for PP→2,…,10 jet observables using of the order of 10¹¹ events.