arXiv subjects

R. Sobie

Publications and source records attributed to R. Sobie.

3 recordsLinked to original sources

arXiv2013

HTC Scientific Computing in a Distributed Cloud Environment

This paper describes the use of a distributed cloud computing system for high-throughput computing (HTC) scientific applications. The distributed cloud computing system is composed of a number of separate Infrastructure-as-a-Service (IaaS) clouds that are utilized in a unified infrastructure. The distributed cloud has been in production-quality operation for two years with approximately 500,000 completed jobs where a typical workload has 500 simultaneous embarrassingly-parallel jobs that run for approximately 12 hours. We review the design and implementation of the system which is based on pre-existing components and a number of custom components. We discuss the operation of the system, and describe our plans for the expansion to more sites and increased computing capacity.

cs.DC↗

arXiv2003

HEP Applications on the Grid Canada Testbed

A Grid testbed has been established using resources at 12 sites across Canada involving researchers from particle physics as well as other fields of science. We describe our use of the testbed with the BaBar Monte Carlo production and the ATLAS data challenge software. In each case the remote sites have no application-specific software stored locally and instead access the software and data via AFS and/or GridFTP from servers located in Victoria. In the case of BaBar, an Objectivity database server was used for data storage. We present the results of a series of initial tests of the Grid testbed using both BaBar and ATLAS applications. The initial results demonstrate the feasibility of using generic Grid resources for HEP applications.

physics.comp-ph↗

arXiv1999

Propagation of Errors for Matrix Inversion

A formula is given for the propagation of errors during matrix inversion. An explicit calculation for a 2 by 2 matrix using both the formula and a Monte Carlo calculation are compared. A prescription is given to determine when a matrix with uncertain elements is sufficiently nonsingular for the calculation of the covariances of the inverted matrix elements to be reliable.

hep-ex↗