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virtu-ALL-izer - a virtual supercomputer within a supercomputer is a scalable tool enabling modification of interconnect topology, computational resources and components of a virtual supercomputing cluster, without the need of stopping computation running on the cluster taking the whole cluster down. 
It is applicable in development of topology-aware communication algorithms, study of impact of interconnect topology on computational problems' performance and, most importantly, discovery of topologies of interconnects, tailored for particular computational problems, by resource and interconnect adjustment, while the computational problem is running on the virtual supercomputing cluster.
Lukasz Orlowski
Supercomputing systems for testing are provided by the courtesy of Interdisciplinary Center for Mathematical and Computational Modelling (ICM, Warsaw, Poland) and A*STAR Computational Resource Centre (A*CRC, Singapore)
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