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It is well known that the TLB performance impacts the memory system performance, which is critical for overall system performance. Similar to multi-level caches, multilevel TLBs have become an important leverage for boosting data access performance. Applications have increasingly large working sets. Servers targeting such applications have thus been built with ever larger main memory capacities, but...
EGNOS is the European SBAS currently providing GPS Safety of Life augmentation over Europe. In parallel with on-going EGNOS operations, GNSS constellations and signals are evolving (GLONASS, GPS, GALILEO, COMPASS, …). This evolving context has led ESA to launch the so-called “European GNSS Evolution Program” (EGEP) in order to explore more in depth the various evolution perspectives and evaluate possible...
System virtualization enables multiple isolated running environments to be safely consolidated on a physical server, achieving better physical resource utilization and power saving. Virtual machine has been an essential component in most of the cloud/data-center system software stacks. However, virtualization brings negative impacts on synchronization in guest operating system (guest OS) and thus...
In uniprocessor real-time systems, resource sharing is usually done using protocols such as Stack Resource Policy, Priority Ceiling Protocol and Priority Inheritance Protocol. Unfortunately these protocols did not work as expected on real-time multiprocessor systems. Such problem must be addressed with different approaches like Multiprocessor Priority Ceiling Protocol (MPCP) and Multiprocessor Stack...
New high performance computing (HPC) applications recently have to face scalability over an increasing number of nodes and the programming of special accelerator hardware. Hybrid composition of large computing systems leads to a new dimension in complexity of software development. This paper presents a novel approach to gain insight into accelerator interaction and utilization without any changes...
To improve the flexibility and extensibility of traditional RTDB systems, which adopt field-specific ways of data representation that always leads to customized development whenever requirements changes, ChRDB manages all the data, both system dependent and project specific, in an object-oriented style. Customized types of data objects and corresponding instances can be easily created to satisfy any...
A key obstacle to large-scale network simulation over PC clusters is the memory balancing problem where a memory-overloaded machine can slow down an entire simulation due to disk I/O overhead. Memory balancing is complicated by (i) the dfficulty of estimating the peak memory consumption of a group of nodes during network partitioning-a consequence of per-node peak memory not being synchronized-and...
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