Versioned transactional shared memory for the FénixEDU web application

Carvalho, Nuno; Cachopo, João; Rodrigues, L.; Silva, António Rito

doi:10.1145/1435523.1435526

Cited by 16 publications

(12 citation statements)

References 13 publications

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“…Read-only transactions play a significant role in various types of applications, including linearizable data structures with a strong prevalence of read-only operations [17], or client-server applications where an STM infrastructure replaces a traditional DBMS approach (e.g., FenixEDU web application [9]). Particularly long read-only transactions are employed for taking consistent snapshots of dynamically updated systems, which are then used for checkpointing, process replication, monitoring program execution, gathering system statistics, etc.…”

Section: Introductionmentioning

confidence: 99%

SMV: Selective Multi-Versioning STM

Perelman

Byshevsky

Litmanovich

et al. 2011

Lecture Notes in Computer Science

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We present Selective Multi-Versioning (SMV), a new STM that reduces the number of aborts, especially those of long read-only transactions. SMV keeps old object versions as long as they might be useful for some transaction to read. It is able to do so while still allowing reading transactions to be invisible by relying on automatic garbage collection to dispose of obsolete versions.SMV is most suitable for read-dominated workloads, for which it achieves much better performance than previous solutions. It has an up to ×11 throughput improvement over a single-version STM and more than a two-fold improvement over an STM keeping a constant number of versions per object. We show that unlike STMs keeping a constant number of versions, SMV operates successfully even in systems with limited memory.

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Section: Introductionmentioning

confidence: 99%

SMV: Selective Multi-Versioning STM

Perelman

Byshevsky

Litmanovich

et al. 2011

Lecture Notes in Computer Science

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“…Strong consistency and fault-tolerance guarantees are also essential when STMs are used to increase the robustness of classic service-oriented applications. This is the case, for instance, of the FenixEDU system [13], a complex web-based Campus activity management system that is currently used in several Portuguese universities. FenixEDU extensively relies on STM technology for transactionally manipulating the in-memory state of its (J2EE compliant) application server.…”

Section: Introductionmentioning

confidence: 99%

D2STM: Dependable Distributed Software Transactional Memory

Couceiro

Romano

Carvalho

et al. 2009

2009 15th IEEE Pacific Rim International Symposium on Dependable Computing

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108

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Software Transactional Memory (STM) systems have emerged as a powerful paradigm to develop concurrent applications. At current date, however, the problem of how to build distributed and replicated STMs to enhance both dependability and performance is still largely unexplored. This time by a non-blocking distributed certification scheme, which we name BFC (Bloom Filter Certification). BFC exploits a novel Bloom Filter-based encoding mechanism that permits to significantly reduce the overheads of replica coordination at the cost of a user tunable increase in the probability of transaction abort. Through an extensive experimental study based on standard STM benchmarks we show that the BFC scheme permits to achieve remarkable performance gains even for negligible (e.g. 1%) increases of the transaction abort rate.

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“…When STM systems are used in the core of enterprise systems, they are faced with the high availability and scalability requirements of production environments [7]. A relevant example is the FénixEDU system, which is a web application that relies on a STM-based solution in order to ensure the consistency of an in memory middle-tier object cache.…”

Section: Introductionmentioning

confidence: 99%

Towards distributed software transactional memory systems

Romano

Carvalho

Rodrigues

2008

Proceedings of the 2nd Workshop on Large-Scale Distributed Systems and Middleware

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The recent architectural trend that has lead to the widespread adoption of multi-core CPUs has fostered a remarkable research interest in Software Transactional Memory (STM). As STMs are starting to face the high availability and scalability requirements of real-world production environments, it is natural to foresee the need for replication solutions specifically tailored for STMs. Since databases and STMs share the same key abstraction of atomic transaction, one could wonder whether the mechanisms originally designed for database replication could be successfully and seamlessly exploited also to support replication of STM systems.This paper seeks an answer to this question, highlighting some critical performance issues related to the application of state of the art database replication techniques in the context of STM systems, and presenting some of our recent research directions aimed at designing and implementing high performance replication strategies able to meet the unique requirements of STMs.

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Versioned transactional shared memory for the FénixEDU web application

Cited by 16 publications

References 13 publications

SMV: Selective Multi-Versioning STM

SMV: Selective Multi-Versioning STM

D2STM: Dependable Distributed Software Transactional Memory

Towards distributed software transactional memory systems

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