The Lofar Central Processing Facility Architecture

Details The Lofar Central Processing Facility Architecture The Lofar Central Processing Facility Architecture

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004exa....17...43s&link_type=abstract

Experimental Astronomy, Volume 17, Issue 1-3, pp. 43-58

Computer Science

Performance

Cluster, Correlator, High Performance Computing, Hpc, Parallel Processing, Pipeline, Streaming Data, Supercomputer

Scientific paper

Reconfiguration is a key feature characteristic of the LOFAR telescope. Software platforms are utilised to program out the required data transformations in the generation of scientific end-products. Reconfigurable resources nowadays often replace the hard-wired processing systems from the past. This paper describes how this paradigm is implemented in a purely general-purpose telescope back-end. Experiences from high performance computing, stream processing and software engineering have been combined, leading to a state-of-the-art processing platform. The processing platform offers a total processing power of 35 TFlops, which is used to process a sustained input data- stream of 320 Gbps. The architecture of this platform is optimised for streaming data processing and offers appropriate processing resources for each step in the data processing chains. Typical data processing chains include Fourier transformations and correlation tasks along with controlling tasks such as fringe rotation correction. These tasks are defined in a high level programming language and mapped onto the available resources at run time. A scheduling system is used to control a collection of concurrently executing observations, providing each associated application with the appropriate resources to meet its timing constraint and give the integrated system the correct on-line and off-line look and feel.

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