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Scientific communities worldwide have set up massive grids that manage several tens of thousands of CPUs and several PetaBytes of storage space. The control and maintenance of these complex systems remain a significant operational challenge. Application developers need synthetic characterizations of the grid activity and the grid applications for predicting(More)
The Green Computing Observatory (GCO) creates a full-fledged data curation process for green IT, providing a unique facility for the Computer Science and Engineering community. The first barrier to improved energy efficiency is the difficulty of collecting data on the energy consumption of individual components of data centers, and the lack of overall data(More)
In March 2013, the W3C recommended SPARQL 1.1 to retrieve and manipulate decentralized RDF data. Real-world usage requires advanced features of SPARQL 1.1. recommendations As these are not consistently implemented, we propose a test framework named TFT (Tests for Triple stores) to test the interoperability of the SPARQL end-point of RDF database systems.(More)
In March 2013, the W3C recommended SPARQL 1.1 to retrieve and manipulate decentralized RDF data. Real-world usage requires advanced features of Recommendation SPARQL 1.1. As these are not consistently implemented, we propose a software named TFT (Tests for Triple stores) to test the interoperability of the SPARQL end-point of RDF database systems. To help(More)
For large-scale distributed systems, the knowledge component at the core of the MAPE-K loop remains elusive. In the context of end-to-end probing, fault monitoring can be re-casted as an inference problem in the space-time domain. We propose and evaluate Sequential Matrix Factorization (SMF), a fully spatio-temporal method that exploits both the recent(More)
In thermally enhanced recovery processes like cyclic steam stimulation (CSS) or steam assisted gravity drainage (SAGD), continuous steam injection entails changes in pore fluid, pore pressure and temperature in the rock reservoir, that are most often unconsolidated or weakly consolidated sandstones. This in turn increases or decreases the effective stresses(More)
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