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Czytelnik w bibliotece cyfrowej
No full textPrezentacja możliwości czytelnika w bibliotece cyfrowej opartej na oprogramowaniu dLibra w wersji 4.0
System dLibra.Dostosowanie interfejsu użytkownika i współpraca z systemami zewnętrznymi.
No full textSystemy identyfikacji obiektów cyfrowych w środowisku sieciowym
No full textOmówienie w kontekście bibliotek cyfrowych systemów identyfikacji obiektów cyfrowych takich jak DOI czy OAI Identifier
No full textPoznańGrid simulation tools provide frameworks for simulating application scheduling in various Grid infrastructures. However, while experimenting with many existing tools, we have encountered two main shortcomings: (i) there are no tools for generating workloads, resources and events; (ii) it is difficult and time consuming to model different Grid levels, i.e. resource brokers, and local level scheduling systems. In this paper we present the Grid Scheduling Simulator (GSSIM), a framework that addresses these shortcomings and provides an easy-to-use Grid scheduling framework for enabling simulations of a wide range of scheduling algorithms in multi-level, heterogeneous Grid infrastructures. In order to foster more collaboration in the community at large, GSSIM is complemented with a portal (http://www.gssim.org) that provides a repository of Grid scheduling algorithms, synthetic workloads and benchmarks for use with GSSIM
System dLibra.Dostosowanie interfejsu użytkownika i współpraca z systemami zewnętrznymi.
No full text
No full textPoznańThis paper describes four case studies of application performance enhancements on the Columbia supercomputer. The Columbia supercomputer is a cluster of twenty SGI Altix systems, each with 512 Itanium 2 processors and 1 terabyte of global shared memory,and is located at the NASA Advanced Supercomputing (NAS) facility in Moffett Field. The code optimization techniques described in the case studies include both implicit and explicit process-placement to pin processes on CPUs closest to the processes’ memory, removing memory contention in OpenMP applications, eliminating unaligned memory accesses, and system profiling. These techniques enabled approximately 2- to 20-fold improvements in application performance