Modular software model checking for distributed systems

By watcharin leungwattanakit, cyrille artho, masami hagiya, yoshinori tanabe, mitsuharu yamamoto and. The distributed systems that provide these services are large and longlived and therefore will need changes upgrades to. Modular model checking can one infer a global property from the local speci cations. Integrated software systems are software packages that combines many applications in one program, in the effective running of the accountancy profession accountants needed a utility program to load data from one program to another, this became very complicated especially where there are huge work volumes therefore necessitating integration of two or more modules that interact and as a result. Interaction model the behavior and state of distributed systems can be described by a distributed algorithm a definition of the steps to be taken by each of the processes, including the transmission of messages between them. Upgrading the software of longlived, highlyavailable distributed systems is difficult. In general, these modeling languages are designed to be suitable for applying model checking techniques and are not necessarily based on a software development paradigm. Distributed systems where the system software runs on a loosely integrated group of cooperating processors linked by a network. Practical software model checking via dynamic interface. Combining environment generation and slicing for modular. One of the main issues verification faces is the socalled state space explosion problem.

Distributed systems are complex, being usually composed of several subsystems running in parallel. Abstraction for model checking modular interpreted systems. This paper presents pipal, a system for modular glass box software model checking, to further improve the scalability of glass box software model checking. Modular software supply chain software for importers. The abstract components are then composed to form an abstract system to which a model checking. The components interact with one another in order to achieve a common goal. The increasing complexity of distributed automation systems requires new methods to verify the correct functionality. To apply model based techniques the overall system model of the automation system is needed. Models and software model checking of a distributed file. Proceedings of the 4th international conference on tools and algorithms for construction and analysis of systems, pages 2035, 1998. This can be useful especially for software, as the software model.

In choosing a computational model, a logic and a preorder to obtain a. Distributed computing is a field of computer science that studies distributed systems. The elements defined in the interface are detectable. We model a dima system as a set of stopwatch automata swa in uppaal to analyze its schedulability by classical model checking mc and statistical model checking smc. Srcs charter is to advance the state of the art in computer systems by doing basic and applied research in support of our companys business objectives. Modular software design, for example, refers to a design strategy in which a system is composed of relatively small and autonomous routines that fit together. The term modular can apply to both hardware and software. Various faulttolerant agreement protocols for asynchronous distributed systems can be constructed in a modular way which is based on consensus and failure detectors. Application of model checking to hardware verification simple data structures are used systems are modular mostly finitestate systems system components have well defined interfaces mostly synchronous execution 8 application of model checking to software verification complex data structures are used procedural or oo design. Transparent model checking of unmodified distributed.

The requirements may be expressed logically, with a deductive design process, or the requirements may come in. Model based verification is an established approach to test the behavior of the system under test, before going into operation. Discovering architectural mismatch in distributed event. Pdf modular software model checking for distributed systems. We build a complex distributed systems software stack using modp. Our results demonstrate that compositional reasoning can help scale model checking both explicit and symbolic to large distributed systems. Citeseerx document details isaac councill, lee giles, pradeep teregowda. Composition of modular models for verification of distributed. We present a frontend tool for translating rebeca to the languages of existing model checkers in order to model check rebeca models. A modular framework for modeling hardware elements in.

Citeseerx internship proposal distributed modelchecking. Finally, the efficiency of our method is evaluated through the experimental results obtained from using two model checking tools, spin and smv. We expect that our assumeguarantee model checking approach is applicable to other modular structured faulttolerant agreement protocols for asynchronous distributed systems. Modular software model checking for distributed systems watcharin leungwattanakit, cyrille artho, masami hagiya, yoshinori tanabe, mitsuharu yamamoto, and koichi takahashi abstractdistributed systems are complex, being usually composed of several. Modular software upgrades for distributed systems springerlink. Stoller, modelchecking multithreaded distributed java programs, proceedings of the 7th international spin workshop on spin model checking and software verification, p.

Modular software model checking for distributed systems abstract. Modular software model checking for distributed systems article pdf available in ieee transactions on software engineering 405. Model checking is emerging as a popular technology for reasoning about behavioral properties of a wide variety of software artifacts including. Ieee transactions on software engineering, issn 00985589, eissn 19393520, ieee transactions on software engineering, vol. To apply modelbased techniques the overall system model of the automation system is needed. It is not possible to upgrade all the nodes in a system at once, since some nodes may be unavailable and halting the system for an upgrade is unacceptable. Revised lectures from the international symposium on compositionality. Stateevent based software model checking 3 the stateeventbased formalism presented in this paper is suitable for both sequential and concurrent systems. Our interests and projects span scalable systems including hardware, networking, distributed systems, and programminglanguage technology, the internet including the web, ecommerce, and information retrieval, and humancomputer interaction including userinterface technology, computerbased appliances, and mobile computing. Given a distributed system, each of its components is reduced by abstracting away from details that are irrelevant for the required specification. His work on the software model checker magic received the acm distinguished paper award for contribution to the study of verification of modular software.

Any distance may separate computers in the network. Further extensions to this work have allowed for the model checking of event systems written in a special purpose language, iil zbcd06. Unit 1 architecture of distributed systems 1 architecture of distributed systemsintroductiona distributed system ds is one in which hardware and software components, located at remote networked computers, coordinate and communicate their actions only by passing messages. Modular programming is a software design technique that emphasizes separating the functionality of a program into independent, interchangeable modules, such that each contains everything necessary to execute only one aspect of the desired functionality a module interface expresses the elements that are provided and required by the module. Efficient computeraided verification of parallel and. Modist is the first model checker designed for transparently checking unmodified distributed systems running on unmodified operating systems. Modp is transforming the way asynchronous software is built at. Personal systems that are not distributed and that are designed to run on a personal computer or workstation.

In order to enable the verification of discrete controllers for such hybrid systems, this contribution proposes an approach that combines decomposition, model checking and deduction. Embedded systems that run on a single processor or on an integrated group of processors. The abstract components are then composed to form an abstract system to which a model checking procedure is. Modular software model checking for distributed systems by watcharin leungwattanakit, cyrille artho, masami hagiya, yoshinori tanabe, mitsuharu yamamoto and koichi takahashi abstract. However it is difficult to design correct faulttolerant distributed protocols especially for asynchronous systems. Modelchecking aims at verifying that a software or hardware system meets its specification. Migration from a centralized to a distributed modeling approach decomposing an engine model modeling of control system components creating a library of reusable modeling components establishing a template for modeling distributed systems working toward a hardwareintheloop hil system simulation benchmarking and. Modular software model checking for distributed systems core. Modular and safe eventdriven programming eecs at uc berkeley. On modular architectures on software architecture medium. A modeling frameworkfor schedulability analysis of.

Modular programming, in the form of subsystems particularly for io and software libraries, dates to early software systems, where it was used for code reuse. Modular abstractions for verifying realtime distributed systems. Abstraction for model checking modular interpreted systems over atl extended abstract, michael koster and peter lohmann, proc. In this work we present a verification methodology for realtime distributed systems, based on their modular decomposition into processes. Software model checking for distributed systems with selectorbased, nonblocking communication. We propose to employ modular techniques to the distributed model checking problem. A distributed system is a system whose components are located on different networked computers, which communicate and coordinate their actions by passing messages to one another.

Modular and safe eventdriven programming eecs at uc. We found no studies that analyzed the schedulability of distributed avionics systems as a whole including the network by model checking. This leads to several orders of magnitude speedups 8 over previous model checking approaches. The algorithmic analysis of control systems for large and distributed hybrid systems is considerably restricted by its computational complexity. The requirements may be expressed logically, with a deductive design process, or the requirements may come in the form of datasets, with an inductive design process. Modular software model checking for distributed systems watcharin leungwattanakit, cyrille artho, masami hagiya, yoshinori tanabe, mitsuharu yamamoto, and koichi takahashi abstract distributed systems are complex, being usually composed of several subsystems running in parallel. More complex forms of reasoning such as induction kurshan and mcmillan 1989 are also possible within this framework. As such they require a formal semantics on which the analysis process is build up. Concurrent execution and interprocess communication in these systems are prone to errors that are difficult to detect by traditional testing, which does not cover every possible. Stoller, model checking multithreaded distributed java programs, proceedings of the 7th international spin workshop on spin model checking and software verification, p.

Modular software model checking for distributed systems watcharin leungwattanakit, cyrille artho, masami hagiya, yoshinori tanabe, mitsuharu yamamoto, and koichi takahashi abstractdistributed systems are complex, being usually composed of several subsystems running in parallel. Modular software model checking for distributed systems. Modp is transforming the way asynchronous software is built at microsoft and amazon web services aws. Home browse by title proceedings compos97 modular model checking. Modelbased verification is an established approach to test the behavior of the system under test, before going into operation.

The opposite of a modular architecture is an integrated architecture, in which no clear divisions exist between components. Embedded systems distributed architectures raise other issues than limited shannon budget and costtocommunicate distributed control architectures cause artifacts that can be problematic for feedback control systems architectures such as ima and autosar aim at enabling modular development of systems in complex supplier chains. Our results demonstrate that compositional reasoning can help scale modelchecking both explicit and symbolic to large distributed systems. Feb 24, 2014 wiki article on this topic starts with this sentence the word software architecture intuitively denotes the high level structures of a software system. An example of a particularly challenging distributed system is multimaster, optimistic. This paper presents a modeling framework for schedulability analysis of distributed integrated modular avionics dima systems that consist of spatially distributed arinc653 modules connected by a unified afdx network. It achieves this transparency via a novel architecture. Yet while a system is upgrading, it must continue to provide service to users.

More than 40 million people use github to discover, fork, and contribute to over 100 million projects. Messages are transmitted to transfer information between processes and to coordinate their activity. Oct 23, 20 modular software model checking for distributed systems abstract. Actl developed for nitestate systems dilian gurov kth stockholm modular software veri cation december 2014 5 29. Modular abstractions for verifying realtime distributed.

Model checking a modularstructured nonblocking atomic. Brief overview of the concept of distributed engine control challenges for modeling distributed systems and creating a versatile hardwareintheloop hil system migration from a centralized to a distributed modeling approach decomposing an engine model modeling of. Jan 07, 2020 we build a complex distributed systems software stack using modp. A modeling framework for schedulability analysis of.

One of the bene ts of restricting ourselves to lineartime logic as opposed to a more expressive logic such as ctl or the modal mucalculus is the ability to invoke the magic compositional. By watcharin leungwattanakit, cyrille artho, masami hagiya, yoshinori tanabe, mitsuharu yamamoto and koichi takahashi. We continually keep our customers business systems fresh with the latest product features and useful technology. Model checking, automated abstraction, and compositional. Discovering architectural mismatch in distributed eventbased. Abstract qc 20170104 distributed systems, based on their modular decomposition into processes.