Detecting repetitive “phases” in program execution is helpful for program understanding, runtime optimization, and for reducing simulation/profiling workload. The nature of the phases that may be found, however, depend on the kinds of programs, as well how programs interact with the underlying hardware. We present a technique to detect long term and variable length repetitive program behaviour ...

Runtime adaptability is a desired quality attribute in business processes, particularly cross-organizational ones. Past work showed that designing and implementing business processes following the REpresentational State Transfer (REST) principles increases runtime adaptability. However, the past solutions for RESTful business processes (RESTfulBP) were limited to manual selection of process fra...

A wireless sensor network (WSN) consists of multiple small and simple computers (nodes), whose performance is tightly linked to its unpredictable deployment environment. It is nearly impossible to design a WSN that performs well in every scenario; instead they are developed for a specific context, with performance rapidly decreasing when environment properties move away from the optimum. Enabli...

NStrace is a bus-driven hardware trace facility developed for the PowerPC@ family of superscalar RlSC microprocessors. It uses a recording of activity on a target processor's bus to infer the sequence of instructions executed during that recording period. NStrace is distinguished from related approaches by its use of an architecture-level simulator to generate the instruction sequence from the ...

Dynamic program optimization is the only recourse for optimizing compilers when machine and program parameters necessary for applying an optimization technique are unknown until runtime. With the movement toward portable parallel programs, facilitated by language standards such as OpenMP, many of the optimizations developed for high-performance machines can no longer be applied prior to runtime...

A program analysis tool can play an important role in helping users understand and improve OpenMP codes. Dragon is a robust interactive program analysis tool based on the Open64 compiler, an open source OpenMP, C/C++/Fortran77/90 compiler for Intel Itanium systems. We developed the Dragon tool on top of Open64 to exploit its powerful analyses in order to provide static as well as dynamic (feedb...

We analyze the way in which a result concerning the absence of runtime type errors can be expressed when the semantics of a language is described using proof rules in what is sometimes called a natural semantics. We argue that the usual way of expressing such results has conceptual short-comings when compared with similar results for other methods of describing semantics. These short-comings ar...

Detecting repetitive " phases " in program execution is helpful for program understanding, runtime optimization, and for reducing simulation/profiling workload. The nature of the phases that may be found, however, depend on the kinds of programs, as well how programs interact with the underlying hardware. We present a technique to detect long term and variable length repetitive program behaviou...

This paper presents a technique to derive and implement error detectors to protect an application from data errors. The error detectors are derived automatically using compiler-based static analysis from the backward program slice of critical variables in the program. Critical variables are defined as those that are highly sensitive to errors, and deriving error detectors for these variables pr...

A large class of security attacks exploit software implementation vulnerabilities such as unchecked buffers. This paper proposes Transparent Runtime Randomization (TRR), a generalized approach for protecting against a wide range of security attacks. TRR dynamically and randomly relocates a program’s stack, heap, shared libraries, and parts of its runtime control data structures inside the appli...