Application characterization at scale

Landwehr, Joshua; Suetterlein, Joshua; Márquez, Andrés; Manzano, Joseph; Gao, Guang R.

doi:10.1145/2903150.2903166

Cited by 10 publications

(1 citation statement)

References 16 publications

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“…As a result, the existing implementation does not have to be changed to implement the proposed object model. The reference implementation created by Intel/Rice University [16], a derived implementation from PNNL [14], and our OCR-Vx implementation [5][6][7] all already conform to the proposed object model. In some cases, they may provide stronger guarantees than required, so the model gives them room for optimizations.…”

Section: Introductionmentioning

confidence: 99%

Consistency model for runtime objects in the Open Community Runtime

Dokulil

2018

J Supercomput

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Task-based runtime systems are seen as a way to deal with increasing heterogeneity and performance variability in modern high performance computing systems. The Open Community Runtime is an example of such runtime system, with the benefit of having an open specification that defines its interface and behavior. This allows others to study the design and create alternative implementations of the runtime system. However, it turns out that the consistency model that defines how the OCR programs are synchronized when executed in parallel is not sufficiently defined. In the following text, we complete the consistency model by filling in the missing pieces and extending the memory model given in the specification.

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Section: Introductionmentioning

confidence: 99%

Consistency model for runtime objects in the Open Community Runtime

Dokulil

2018

J Supercomput

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The OCR-Vx experience: lessons learned from designing and implementing a task-based runtime system

Dokulil

Benkner

2022

J Supercomput

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Task-based runtime systems are an important branch of parallel programming research, since tasks decouple computation from the compute units, giving the runtime systems greater flexibility than a thread-based solution. This makes it easier to deal with the ever-increasing complexity of parallel architectures by providing a separation of concerns—the specification of parallelism is separated from the implementation of the parallel computations on a specific architecture. The Open Community Runtime is one such system, aimed at large-scale parallel systems. Unlike many other task-based runtime systems, the creators not only provided an implementation but there is also a comprehensive specification document. This has allowed us to create an independent implementation, called OCR-Vx. In this article, we present our experience of developing the runtime system, put our work in the context of the specification and the other implementations, and describe key lessons that we have learned during our work. We discuss the design and implementation issues of task-based runtime systems and applications including task synchronization and scheduling, data management, memory consistency, the relation between shared-memory and distributed-memory runtime systems, NUMA architectures, and heterogeneous systems. The article is aimed at audiences not familiar with OCR, since we believe these lessons could be valuable for developers working on other task-based runtime systems or designing new ones.

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