Software Transactional Memory
Software transactional memory (STM) is a synchronous mechanism for concurrent programs with shared memory. STM provides programmers with a high-level, easy to use abstraction of concurrency control, freeing them from explicit usage of synchronisation concepts like locks or semaphores. Basically, an STM allows a programmer to put code into a transaction, and let the STM algorithm guarantee execution of the transaction atomically in all-or-nothing fashion.
Participants: Heike Wehrheim, Jürgen König, John Derrick (University of Sheffield), Brijesh Dongol (Brunel University London), Gerhard Schellhorn (Universität Augsburg)
Former Participants: Oleg Travkin
VaST - Validation of Software Transactional Memory
Up to now, a large number of transactional memory concepts have been proposed, implementing TMs in hardware, in software or in a combination (hybrid TMs), and these have found their way into mainstream programming language and processor design. To achieve high performance even in the face of thousands of parallel processes, STMs try to allow for as much concurrency as possible, restricting synchronization to the minimal amount necessary for correctness. Correctness of STMs is typicall formalized in a notion called opacity, stating "seemingly atomic" execution of transactions; in particular enhancing it with meaning for aborting transactions.
The key objective of this project is the development of a validation toolbox for STMs. It will include three main ingredients:
- a method (and tool) for testing STMs,
- a method (and tool) for model checking STMs and
- a method for mechanically proving correctness of STMs.
Thereby, this project shall support the whole lifecycle of STM design, from rapid prototyping in early design stages to the final product of a high performant, formally verified STM algorithm.
Funding
This project is funded by the German Research Council DFG (VaST, 2018 - 2020).
Publications
J. Derrick, B. Dongol, G. Schellhorn, O. Travkin, H. Wehrheim, in: N. Bj{\o}rner, F. S. de Boer (Eds.), {FM} 2015: Formal Methods - 20th International Symposium, Oslo, Norway, June 24-26, 2015, Proceedings, 2015, pp. 161--177.
S. Doherty, B. Dongol, J. Derrick, G. Schellhorn, H. Wehrheim, in: P. Fatourou, E. Jim{\’{e}}nez, F. Pedone (Eds.), 20th International Conference on Principles of Distributed Systems, {OPODIS} 2016, December 13-16, 2016, Madrid, Spain, 2016, pp. 35:1--35:17.
J. König, H. Wehrheim, in: D. Van Hung, D. Kapur (Eds.), Theoretical Aspects of Computing - {ICTAC} 2017 - 14th International Colloquium, Hanoi, Vietnam, October 23-27, 2017, Proceedings, 2017, pp. 118--135.
G. Schellhorn, M. Wedel, O. Travkin, J. König, H. Wehrheim, in: Software Engineering and Formal Methods, Springer International Publishing, Cham, 2018, pp. 105–120.
J. Derrick, S. Doherty, B. Dongol, G. Schellhorn, H. Wehrheim, in: Formal Methods - The Next 30 Years - Third World Congress, {FM} 2019, Porto, Portugal, October 7-11, 2019, Proceedings, 2019, pp. 179–195.
J. König, H. Wehrheim, in: J. M. Badger, K. Yvonne Rozier (Eds.), {NASA} Formal Methods - 11th International Symposium, {NFM} 2019, Houston, TX, USA, May 7-9, 2019, Proceedings, Springer, 2019, pp. 263–279.
S. Doherty, B. Dongol, H. Wehrheim, J. Derrick, in: J. K. Hollingsworth, I. Keidar (Eds.), Proceedings of the 24th {ACM} {SIGPLAN} Symposium on Principles and Practice of Parallel Programming, PPoPP 2019, Washington, DC, USA, February 16-20, 2019, {ACM}, 2019, pp. 355–365.
E. Bila, S. Doherty, B. Dongol, J. Derrick, G. Schellhorn, H. Wehrheim, in: A. Gotsman, A. Sokolova (Eds.), Formal Techniques for Distributed Objects, Components, and Systems - 40th {IFIP} {WG} 6.1 International Conference, {FORTE} 2020, Held as Part of the 15th International Federated Conference on Distributed Computing Techniques, DisCoTec 2020, Valletta, Malta, June 15-19, 2020, Proceedings, Springer, 2020, pp. 39–58.
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