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• W4231994816 abstract "Commodity heterogeneous systems (e.g., integrated CPUs and GPUs), now support a unified, shared memory address space for all components. Because the latency of global communication in a heterogeneous system can be prohibi-tively high, heterogeneous systems (unlike homogeneous CPU systems) provide synchronization mechanisms that only guarantee ordering among a subset of threads, which we call a scope. Unfortunately, the consequences and se-mantics of these scoped operations are not yet well under-stood. Without a formal and approachable model to reason about the behavior of these operations, we risk an array of portability and performance issues. In this paper, we embrace scoped synchronization with a new class of memory consistency models that add scoped synchronization to data-race-free models like those of C++ and Java. Called sequential consistency for heterogeneous-race-free (SC for HRF), the new models guarantee SC for programs with sufficient synchronization (no data races) of sufficient scope. We discuss two such models. The first, HRF-direct, works well for programs with highly regular parallelism. The second, HRF-indirect, builds on HRF-direct by allowing synchronization using different scopes in some cases involving transitive communication. We quanti-tatively show that HRF-indirect encourages forward-looking programs with irregular parallelism by showing up to a 10% performance increase in a task runtime for GPUs." @default.
• W4231994816 created "2022-05-12" @default.
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• W4231994816 date "2014-02-24" @default.
• W4231994816 modified "2023-09-26" @default.
• W4231994816 title "Heterogeneous-race-free memory models" @default.
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• W4231994816 doi "https://doi.org/10.1145/2654822.2541981" @default.
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