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The technique of deterministic record and replay aims at faithfully reenacting an earlier program execution. For concurrent programs, it is one of the most important techniques for program understanding and debugging. This demo presents LEAP: an efficient technique as well as a tool prototype to deterministically replay concurrent Java programs on(More)
—Middleware platforms, such as Web services, J2EE, CORBA, and DCOM, have become increasingly popular during the last decade. They have been very successful in solving distributed computing problems for a large family of application domains. The architecture of middleware systems have gone through many significant cycles of evolution, both in terms of the(More)
Writing efficient synchronization for multithreaded programs is notoriously hard. The resulting code often contains subtle concurrency bugs. Even worse, many bug fixes introduce new bugs. A classic example, seen widely in practice, is deadlocks resulting from fixing of an atomicity violation. These complexities have motivated the development of automated(More)
Abstractâ Deterministic replay remains as one of the most effective ways to comprehend concurrent bugs. Existing approaches either maintain the exact shared read-write linkages with a large runtime overhead or use exponential off-line algorithms to search for a feasible interleaved execution. In this paper, we propose Stride, a hybrid solution that(More)
Atomicity, a general correctness criteria in concurrency programs, is often violated in real-world applications. What is worse is that the violations are difficult to be fixed by the developers, which makes the automatic bug fixing techniques attractive solutions. The state of the art aims at automating the manual fixing process and can not provide any(More)
We present CLAP, a new technique to reproduce concurrency bugs. CLAP has two key steps. First, it logs thread local execution paths at runtime. Second, offline, it computes memory dependencies that accord with the logged execution and are able to reproduce the observed bug. The second step works by combining constraints from the thread paths and constraints(More)
Conventional middleware architectures suffer from insufficient module-level reusability and the ability to adapt in face of func-tionality evolution and diversification. To overcome these deficiencies, we propose the Modelware methodology adopting the Model Driven Architecture (MDA) approach and aspect oriented programming (AOP). We advocate the use of(More)
One of the major difficulties in debugging concurrent programs is that the programmer usually experiences frequent thread context switches, which perplexes the reasoning process. This problem can be alleviated by trace simplification techniques, which produce the same computation process but with much fewer number of context switches. The state of the art(More)
Concurrent programs proliferate as multi-core technologies advance. The regression testing of concurrent programs often requires running a failing test for weeks before catching a faulty interleaving, due to the myriad of possible interleavings of memory accesses arising from concurrent program executions. As a result, the conventional approach that selects(More)