Implementing the Open Community Runtime for Shared-Memory and Distributed-Memory Systems

Dokulil, Jiri; Sandrieser, Martin; Benkner, Siegfried

doi:10.1109/pdp.2016.81

Cited by 14 publications

(9 citation statements)

References 5 publications

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“…Finally, managing the state of data blocks can be streamlined in a shared-memory environment, since there is no need to support remote copies. Combined, we have observed as much as 1.62x speedup compared to OCR-Vdm running on the same hardware [24]. However, the XSOCR performance suggests that there is a significant space for improvement and it would be possible (with significant effort) to get the OCR-Vdm performance much closer to OCR-Vsm.…”

Section: Ocr-vsmmentioning

confidence: 66%

“…Our distributed implementation of OCR [24] is called OCR-Vdm, becoming the second part of our OCR-Vx suite of OCR implementations. It can use either sockets or MPI for communication.…”

Section: Ocr-vdmmentioning

confidence: 99%

“…Since 2014, we have been developing an implementation of the OCR specification called OCR-Vx [18,24]. We have targeted both shared-memory and distributed-memory parallel architectures, as well as some less common architectures like the Intel Xeon Phi (both in the KNC coprocessor [18] and KNL processor format [19]) and OpenCL accelerators.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Ocr-vsmmentioning

confidence: 66%

“…Our distributed implementation of OCR [24] is called OCR-Vdm, becoming the second part of our OCR-Vx suite of OCR implementations. It can use either sockets or MPI for communication.…”

Section: Ocr-vdmmentioning

confidence: 99%

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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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“…Initially, the distributed OCR-Vx implementation (OCR-Vdm) implementation did not use confirmation messages [7]. This was a source of race conditions.…”

Section: Immediate Confirmation Protocolmentioning

confidence: 99%

“…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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Automatic Detection of Synchronization Errors in Codes that Target the Open Community Runtime

Dokulil

Katreniaková

2018

Euro-Par 2018: Parallel Processing

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Implementing the Open Community Runtime for Shared-Memory and Distributed-Memory Systems

Cited by 14 publications

References 5 publications

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

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

Consistency model for runtime objects in the Open Community Runtime

Automatic Detection of Synchronization Errors in Codes that Target the Open Community Runtime

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