Speaker
C. Nicholson
(UNIVERSITY OF GLASGOW)
Description
In large-scale Grids, the replication of files to different sites is an important
data management mechanism which can reduce access latencies and give improved usage
of resources such as network bandwidth, storage and computing power.
In the search for an optimal data replication strategy, the Grid simulator OptorSim
was developed as part of the European DataGrid project. Simulations of various HEP
Grid scenarios have been undertaken using different job scheduling and file
replication algorithms, with the experimental emphasis being on physics analysis
use-cases. Previously, the CMS Data Challenge 2002 testbed and UK GridPP testbed were
among those simulated; recently, our focus has been on the LCG testbed. A novel
economy-based strategy has been investigated as well as more traditional methods,
with the economic models showing distinct advantages in terms of improved resource
usage.
Here, an overview of OptorSim's design and implementation is presented with a
selection of recent results, showing its usefulness as a Grid simulator both in its
current features and in the ease of extensibility to new scheduling and replication
algorithms.
Primary authors
C. Nicholson
(UNIVERSITY OF GLASGOW)
D. Cameron
(UNIVERSITY OF GLASGOW)
F. Zini
(ITC-irst)
K. Stockinger
(Lawrence Berkeley National Laboratory)
P. Millar
(UNIVERSITY OF GLASGOW)
R. Carvajal-Schiaffino
(ITC-irst)
