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We present an original concept for patch generation: we propose to do it directly in production. Our idea is to generate patches on-the-fly based on automated analysis of the failure context. By doing this in production, the repair process has complete access to the system state at the point of failure. We propose to perform live regression testing of the generated patches directly on the production...
The Internet of Things (IoT) has a great potential to change our lives. Billions of heterogeneous, distributed, intelligent, and sometimes mobile devices, will be connected and offer new types of applications and ways to interact. The dynamic environment of the IoT, the involvement of the human in the loop, and the runtime interactions among devices and applications, put additional requirements on...
Adapting systems to the changes of their ubiquitous environments is a complex task. The autonomic computing was proposed as a solution to tackle this complexity. It brings a system with self-management capabilities to dynamically adapt itself to context. We are interested in the architectural adaptation approaches of autonomic applications which follow the MAPE-K loop process. During the execution...
To benefit from utility-driven and rule-based approaches to self-adaptation, we propose combining both by defining and linking the utility function and the adaptation rules in a pattern-based way at the architectural level.
Adaptations need to be considered at design-time (adapting complex systems to new technologies, reengineering due to new regulations etc.), but also during runtime (e.g. new emerging functional and non-functional requirement, context-specific decisions). Objective: I use SPLs as a strategy for coping with uncertainty and adapting to change, where conventionally change occurs in the requirements of...
This brief presents a method to map multiple concurrently executing independent tasks onto a coarse-grain reconfigurable architecture (CGRA) with adaptive frequency control to increase the overall throughput and minimize the total area. The commercial CGRA targeted in this brief is embedded as an IP into reconfigurable systems-on-a-chip and is runtime reconfigurable. It is able to reconfigure its...
Driven by the emergence of new computing environments, dynamically evolving software systems makes it impossible for developers to deploy software with human-centric processes. Instead, there is an increasing need for automation tools that continuously deploy software into execution, in order to push updates or adapt existing software regarding contextual and business changes. Existing solutions fall...
Systems-of-Systems (SoS) result from associating independent, complex systems for fulfilling given missions. In particular, SoS require software architectures that can cope with their dynamic, critical nature. Selecting adequate Architecture Description Languages (ADLs) for representing such architectures contributes for a better communication, analysis, and evolution of these systems. Nonetheless,...
The requirement for large compute capabilities led to a wide use of accelerated high performance computing systems. In order to lower the burden for programming these new architectures, user friendly programming paradigms like OpenACC and OpenMP have come to existence. They offer pragmas to shift effort from the programmer to the compiler and runtime system, particularly for data management. However,...
The main idea behind this article is to propose technological tools in order to design, implement and deploy applications dedicated to smart-∗. Our approach is particularly relative to the smart cities domain, which is the most suitable field of experimentation for a wider domain called long-life applications. Currently, our computers and more generally, our mobile devices (tablets, smartphones) host...
The design and implementation of a multitasking runtime system for mixed-architecture applications on a tightly coupled FPGA-CPU platform is presented. The runtime environment and the user applications assume an underlying machine that encompasses multiple computing architectures within a unified machine model. Using this model, a unified process scheduling mechanism was developed that enables concurrent...
Policies are rules that govern the choices in behavior of a system. Policy based management aims at supporting dynamic adaptability of behavior by changing policy without recoding or stopping the system. The common accepted architecture of such systems includes two main management agents: the Policy Decision Point that analyses requests and set decisions based on a policy and the Policy Enforcement...
The increasing use of runtime-compiled applications provides an opportunity for coarse-grained reconfigurable architecture (CGRA) accelerators to be used in a user-transparent way. The challenge is to provide efficient runtime translation for CGRAs. Despite the apparent difficulties stemming from the heterogeneous nature of CGRAs, this paper demonstrates that it is possible to speed up runtime-compiled...
The design and implementation of a multitasking run-time system on a tightly coupled FPGA-CPU platform is presented. Using a mix of CPU and FPGA programmable logic for computing, user applications are executed as mixed-architecture processes from the perspective of the OS. Context switching mechanisms with hybrid scheduling containing both blocking and preemption support were implemented to support...
Nowadays, dynamically adaptive systems are gaining more widespread use in several domains (mobile application, airports, banks, etc). These systems are often subject to evolution due to varying environmental conditions and the apparition of new user requirements. To maintain their usefulness, such systems must be always available and reliable. In this paper, we are particularly interested in the problem...
Dynamic Software Product Lines (DSPL) have gained significant attention in academic community by involving aspects of product lines and runtime adaptable systems development. Managing dynamic variations demands is a challenge addressed by DSPL paradigm. In this context, this paper introduces the results of a systematic literature review that involved 2,084 studies, with the objective of understanding...
Advancements in Service-Oriented Architectures, Cloud Computing and Wireless Sensor Networks pose challenges with respect to dynamic application adaptation, the ability to reconfigure applications so as to support continuous, unimpeded augmentation of services in response to changing environmental circumstances. Proactivity of Service Based applications refers to anticipatory, change-oriented and...
Programmable hardware built on a regular architecture can partially alleviate the problem of increased defect densities associated with transistor scaling by dynamically wiring around the defects~\cite{Paul2006}. The fine granularity of FPGAs is however unsuitable for effectively exploiting runtime reconfiguration because of the high overheads involved. A coarse grain reconfigurable array with malleable...
Running with static requirements and design decisions, a software system cannot always perform optimally in a highly uncertain and rapidly changing environment. Quality-driven self-adaptation, which enables a software system to continually adapt its structure and behavior to improve the overall quality satisfaction, thus becomes a promising capability of software systems. Existing researches on self-adaptive...
Service-based software applications, such as pervasive and ubiquitous ones, are increasingly embedded in our daily lives integrating smart communicating devices. Usually, changes in the execution context of these applications occur unpredictably over time, such as dynamic variations in the availability of the used services and devices, or of the user location and needs. This unpredictable variability...
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