Horst Schirmeier

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Data management functionality is not only needed in large-scale server systems, but also in embedded systems. Resource restrictions and heterogeneity of hardware, however, complicate the development of data management solutions for those systems. In current practice, this typically leads to the redevelopment of data management because existing solutions(More)
Many years of research on dependable, faulttolerant software systems yielded many tool implementations for vulnerability analysis and experimental validation of resilience measures. We identify two disjoint classes of fault-injection (FI) experiment tools in the field, and argue that both are plagued by inherent deficiencies, such as insufficient target(More)
Memory errors are a major source of reliability problems in current computers. Undetected errors may result in program termination, or, even worse, silent data corruption. Recent studies have shown that the frequency of permanent memory errors is an order of magnitude higher than previously assumed and regularly affects everyday operation. Often, neither(More)
Since the first identification of physical causes for soft errors in memory circuits, fault injection (FI) has grown into a standard methodology to assess the fault resilience of computer systems. A variety of FI techniques trying to mimic these physical causes has been developed to measure and compare program susceptibility to soft errors. In this paper,(More)
The software product line (SPL) community defines SPLs not only by technical aspects like configurability and code reuse among product line variants, but also by the engineering process that accompanies the development. This paper discusses the question whether this engineering process is a mandatory property of SPLs; it concretely examines the Linux(More)
Recent studies indicate that the number of system failures caused by main memory errors is much higher than expected. In contrast to the commonly used hardware-based countermeasures, for example using ECC memory, software-based fault-tolerance measures are much more flexible and can exploit application knowledge, such as the criticality of specific data(More)
Arithmetic error coding schemes (AN codes) are a well known and effective technique for soft error mitigation. Although coding theory being a rich area of mathematics, their implementation seems to be fairly easy. However, compliance with the theory can be lost easily while moving towards an actual implementation – finally jeopardizing the aspired(More)
Software product lines (SPLs) are used to build tailor-made applications based on the features of a domain. Optional and alternative features introduce variability into an SPL that is needed for customization. Variability of method signatures is sometimes necessary to provide additional arguments for optional features. However, this complicates the(More)
Memory errors are a major source of reliability problems in computer systems. Undetected errors may result in program termination or, even worse, silent data corruption. Recent studies have shown that the frequency of permanent memory errors is an order of magnitude higher than previously assumed and regularly affects everyday operation. To reduce the(More)