GridX1: A Canadian computational grid Agarwal, A.; Ahmed, M.; Berman, A. ...
Future generation computer systems,
06/2007, Letnik:
23, Številka:
5
Journal Article
Recenzirano
The present paper discusses the design and application of GridX1, a computational grid project which uses shared resources at several Canadian research institutions. The infrastructure of GridX1 is ...built using off-the-shelf Globus Toolkit 2 middleware, a MyProxy credential server, and a resource broker based on Condor-G to manage the distributed computing environment. The broker-based job scheduling and management functionality are exposed as a Globus GRAM job service. Resource brokering is based on the Condor matchmaking mechanism, whereby job and resource attributes are expressed as ClassAds, with the attributes
Requirements and
Rank being used to define respectively the constraints and preferences that the matched entity must meet. Various strategies for ranking resources are presented, including an Estimated-Waiting-Time (EWT) algorithm, a throttled load balancing strategy, and a novel external ranking strategy based on data location. One of the unique features is a mechanism which transparently presents the GridX1 resources as a single compute element to the LHC Computing Grid (LCG), based at the CERN Laboratory in Geneva. This interface was used during the ATLAS data challenge 2 to federate the Canadian resources into the LCG without the overhead of maintaining separate LCG sites. Further, the BaBar particle physics simulation has been adapted to execute on GridX1 and resulted in a simplified management of the production. The usage of the throttled EWT and load balancing strategies combined with external data ranking was found to be very effective in improving efficiency and reducing the job failure rate.
Measurement of the W boson mass Abe, F; Albrow, MG; Amidei, D ...
Physical review. D, Particles and fields,
11/1995, Letnik:
52, Številka:
9
Journal Article
The ATLAS-Canada network Gable, I; Bedinelli, M; Butterworth, S ...
Journal of physics. Conference series,
12/2008, Letnik:
119, Številka:
5
Journal Article
Recenzirano
Odprti dostop
The ATLAS-Canada computing model consists of a WLCG Tier-1 computing centre located at the TRIUMF Laboratory in Vancouver, Canada, and two distributed Tier-2 computing centres in eastern and western ...Canadian universities. The TRIUMF Tier-1 is connected to the CERN Tier-0 via a 10G dedicated circuit provided by CANARIE. The Canadian institutions hosting Tier-2 facilities are connected to TRIUMF via 1G lightpaths, and routing between Tier-2s occurs through TRIUMF. This paper discusses the architecture of the ATLAS-Canada network, the challenges of building the network, and the future plans.
A search for narrow resonances that decay into tt pairs has been performed using 130 pb(-1) of data in the lepton + jets channel collected by the Dphi detector in pp collisions at square root of ...(s)=1.8 TeV. There is no significant deviation observed from the standard-model predictions at a top-quark mass of 175 GeV/c2. We therefore present upper limits at the 95% confidence level on the product of the production cross section and branching fraction to tt for narrow resonances as a function of the resonance mass MX. These limits are used to exclude the existence of a leptophobic top-color particle with mass MX<560 GeV/c2, using a theoretical cross section for a width GammaX=0.012MX.
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