Adaptive software transactional memory

Software transactional memory stm can run on conv conflict detection via adaptive signature for software transactional memory ieee conference publication. Weighted adaptive concurrency control for software. Implementing a high performance software transactional memory. Autonomic parallelism adaptation on software transactional. The nonblocking progress implementations for stm forces transactions to.

As the downside, software implementations usually come with a performance penalty, when compared to hardware. The rise of multicore processor architecture has reshaped supercomputing and marked the beginning of a new era. Additionally, adaptive locks simplifythe programming model by reducing the need for. Adaptive transaction scheduling for transactional memory. A dynamically adaptive hybrid transactional memory for big data 1. A software transactional memory stm is a shared object which behaves like a memory that supports muldequeue begintransaction deleteditemreadtransactionalhead if deleteditemnull returnedvalueempty else ritetransactionalhead, deleteditemc.

Adaptive transaction scheduling for transactional memory systems a thesis presented to the academic faculty by richard m. In proc of the conference on programming language design and implementation. Software transactional memory stm stands as powerful concurrent programming paradigm, enabling atomicity, and isolation while. Its adaptive insights for finance solution offers everything a business needs to create an efficient financial planning process, including comprehensive dashboards and modeling capabilities.

Dstm2 sun labs dynamic software transactional memory library. Processorsruntime environments keywords software transactional memory, concurrency. Scott computer science department, university of rochester computer science department, the college of william and. Software transactional memory for dynamicsized data structures. Software transactional memory stm turned into one of the most promising abstractions to bridge the gap between mainstream programmers and parallel programming. Performance evaluation of adaptivity in software transactional memory mathias payer eth zurich, switzerland mathias. Software transactional memorystm is a concurrency control mechanism, analo gous to the concept of transactions 24 used in database systems to control. Software transactional memory stm 15 algorithms differ in how they detect con. Proceedings of the 20th acm sigplan symposium on principles and practice of parallel programming ppopp 2015, 97108. Adaptive transaction scheduling for transactional memory systems richard m. Recent stm systems, though signicantly more practical than their predecessors, display inconsistent performance. It is an option before tms are available in commercial multicore processors.

Adltabatabai et al, compiler and runtime support for efficient software transactional memory. Software transactional memory stm can run on conventional processors without additional hardware support. Adaptive software transactional memory springerlink. High performance computing for computational science. Corporate performance management software cpm software. Citeseerx document details isaac councill, lee giles, pradeep teregowda. Low overhead dynamically adaptive hybrid transactional memory on. Weighted adaptive concurrency control for software transactional memory article pdf available in the journal of supercomputing 683.

Adaptive insights for finance cpm software is purposebuilt on a powerful cloud computing platform with a modern inmemory calculation engine. To this aim, we propose the concept of adaptive transaction scheduling on transactional memory systems. Software transactional memory stm is a generic synchronization construct that enables automatic conversion of correct sequential objects into correct nonblockingconcurrent objects. Software transactional memory systems enable a programmer to easily write concurrent data structures such as lists, trees, hashtables, and graphs, where nonconflicting operations proceed in parallel. Embrace active planning with the only corporate performance management software that is easy, powerful, and fast. Adaptive transaction scheduling for mixed transactional workloads. Software transactional memory stm was introduced by shavit and touitou in 1995 as an alternative to lockbased synchronisation in concurrent programming which, in general, is notoriously difficult to get right. Adaptive transaction scheduling for mixed transactional. In high performance, high core situations, use the transactional memory feature to reduce spinlock contention. A machine learning approach to adaptive software transaction memory 2011.

Prior work presented adaptive concurrency control, which adapts the number of active threads at runtime, and thus the number of concurrently executing transactions, based on available parallelism. Software transactional memory stm is a generic synchronization construct that enables automatic conversion of correct sequential objects into correct nonblocking concurrent objects. Transactional memory synthesis lectures on computer. Adaptive software transactional memory 357 on the otherside ofthe tradeoff,lazyacquirecangreatlyshrinkthe windowwherein transactions see each other as contenders and may be unnecessarily aborted or delayed. Towards applying machine learning to adaptive transactional. In this paper, we argue that adaptive contention management is. Although the implementations of stms are simple and efficient, they display inconsistent performance.

It is an adaptive hybrid of gv4 and gv5 to perform the best possible results. Understanding tradeoffs in software transactional memory. Adaptive software transactional memory rochester cs. Many of these structures take the abstract form of a dictionary, in which each transaction is associated with a search key.

An approach to cope with this issue consists in putting in place smart scheduling policies which temporarily suspend the execution of some transaction in order to reduce the actual conflict rate. Adaptive insights is a leading provider of cloudbased corporate performance management cpm software for budgeting, reporting and forecasting. Transactional programming models can be supported in software using softwarebased transactional memory stm, in hardware using hardware based transactional memory htm, or in a combination of the two hybrid tm, or hytm software based transactional memory stm can allow sequences of concurrent operations to be combined into atomic. However, the performance of existing cms is sensitive to transaction workload and system platforms. Recent stm systems, though significantly more practical than their predecessors, display inconsistent performance.

Unfortunately, the performance of stmbased applications may vary greatly, depending on the applications workload. We propose a new form of software transactional memory stm designed. The shift to multicore also marks an inflection point for mainstream software design philosophy 1. Several tm systems use signatures to track items read and written during a transaction and to detect. Software transactional memory stm is a generic synchronization construct that enables automatic conversion of correct sequential objects into cor rect. Software transactional memory, openmp and pthread implementations of the conjugate gradients method a preliminary evaluation. Software transactional memory stm helps here with speculative concurrent execution. Towards applying machine learning to adaptive transactional memory. Instead of relying on the programmer to manage entry into critical sections, tm realizes.

Conflict detection via adaptive signature for software. This paper introduces transactional memory, a new multiprocessor architecture intended to. Software transactional memory provides transactional memory semantics in a software runtime library or the programming language, and requires minimal hardware support typically an atomic compare and swap operation, or equivalent. Tm can be implemented in software, hardware or a combination of.

In software transactional memory stm systems, the contention management cm policy decides what action to take when a conflict occurs. Software transactional memory stm is a promising paradigm which simplifies concurrent programming for chip multiprocessors. Software transactional memory stm is a generic synchronization construct that enables automatic conversion of correct sequential objects into correct. Deuce a runtime environment for java software transactional memory using byte code manipulation. Jan 17, 2020 adaptive insights is a leading provider of cloudbased corporate performance management cpm software for budgeting, reporting and forecasting. Lerna is a compiler framework that automatically and transparently detects and extracts parallelism from sequential code through a set of techniques including code pro. Scott computer science department, university of rochester computer science department, the college of william and mary computer science department, rice university.

Architectural support for lockfree data structures maurice herlihy digital equipment corporation. Extracting parallelism from legacy sequential code using. A hardware transactional memory htm system uses multiword synchronization operations of the cpu to implement the requirements of the transaction directly e. Transactional memory, 2nd edition synthesis lectures on.

Software transactional memory stm may suffer from performance degradation due to excessive conflicts among concurrent transactions. Refs are bound to a single storage location for their lifetime, and only allow mutation of that location to occur within a transaction. Traditional lockedbased programming is poorly suited to handling hundreds of threads as it overserializes the code while finegrained locking is notoriously errorprone. Software transactional memory stm is a promising approach for concurrency control in parallel computing environment. While vars ensure safe use of mutable storage locations via thread isolation, transactional references refs ensure safe shared use of mutable storage locations via a software transactional memory stm system.

The promise of stm may likely be undermined by its overheads and workload applicabilities. In particular, with lazy acquire transaction a will never be aborted by transaction b if b itself aborts before aattempts to commit. Software transactional memory stm a full software approach of tm. Barcelona supercomputing center chalmers university of technology. Hybrid transactional memory can execute transactions using htm if available, but can also. The overheads have led some authors to even claim that software transactional memory is only a research toy 4. Lowoverhead software transactional memory with progress. Autonomic parallelism adaptation on software transactional memory. Mark moir is the principal investigator of the scalable synchronization research group at oracle labs. Software transactional memory, adaptive concurrency control, thread scheduling. In computer science, software transactional memory stm is a concurrency control mechanism analogous to database transactions for controlling access to. Pdf weighted adaptive concurrency control for software. Adaptive software transactional memory proceedings of the. Based on this study, we successfully devise a transaction scheduling mechanism that guar.

Adaptive insights is a cloudbased planning and performance management software designed to simplify and streamline all aspects of data analysis. Applications of the adaptive transactional memory test. An objectoriented approach to nonuniform cluster computing. Dynamic contention management by joel cameron frank this thesis addresses the problem of contention management in software transactional memory stm, which is a scheme for managing shared memory in a concurrent programming environment. Transactional programming in a multicore environment. That means our highly scalable, secure architecture and infrastructure deliver consistent performance no matter how many users or locations you have or the number and complexity of your models. A machine learning approach to adaptive software transaction. Prior to that, moir was an assistant professor in the department of computer science at the university of pittsburgh from august 1996 until june 2000. Applications of the adaptive transactional memory test platform. Adaptive software transactional memory acm digital library. Adaptive software transactional memory proceedings of. This book presents an overview of the state of the art in the design and implementation of transactional memory systems, as of early spring 2010.

Would you like to participate in a short survey about the sap help portal. Next generation cuda architecture, code named fermi. Many of these structures take the abstract form of a dictionary, in which each transaction is. Hybrid transactional memory 2 is an effective way to exploit besteffort htm to provide the simplicity and. Were upgrading the acm dl, and would like your input. Oct 24, 2008 concurrency pdf october 24, 2008 volume 6, issue 5 software transactional memory. Transactional memory tm is a promising way to coordinate concurrent threads in multicore processors. Adaptive modelbased scheduling in software transactional memory. A machine learning approach to adaptive software transaction memory by qingping wang a thesis presented to the graduate committee of lehigh university.

Introduction basic transactions building on basic transactions software transactional memory hardwaresupported transactional memory conclusions. A machine learning approach to adaptive software transaction memory qingping wang. This is because reasoning about the interactions of multiple concurrently running threads and low level operational details of synchronisation primitives. Autonomic parallelism adaptation on software transactional memory naweiluo zhou grenoble universityinria, france gwenael delaval grenoble university,france bogdan robu grenoble university,france eric rutten inria,france jeanfrancois mehaut grenoble universityinria,france naweiluo.

Tongxin bai xipeng shen chengliang zhang william n. The nonblocking progress implementations for stm forces transactions to abort. Transactional memory programs may have dynamic available parallelism, which is defined as the number of transactions that can be committed concurrently. Performance tradeoffs in software transactional memory. Adaptive transaction scheduling for transactional memory systems. Dec 26, 2019 therefore, in this paper we propose the use of a lockfree approach to parallel abs using software transactional memory stm in conjunction with the pure functional programming language haskell, which in combination, removes some of the problems and complexities of parallel implementations in imperative approaches.