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• W2143194988 abstract "Hybrid processors are HW/SW co-designed processors that leverage blocked-execution, the execution of regions of instructions as atomic blocks, to facilitate aggressive speculative optimization. As we move to a multicore hybrid design, fine grained conflicts for shared data can violate the atomicity requirement of these blocks and lead to expensive squashes and rollbacks. However, as these atomic regions differ from those used in checkpointing and transactional memory systems, the extent of this potentially prohibitive problem remains unclear, and mechanisms to mitigate these squashes dynamically may be critical to enable a highly per-formant multicore hybrid design. In this work, we investigate how multithreaded applications, both benchmark and commercial workloads, are affected by squashes, and present dynamic mechanisms for mitigating these squashes in hybrid processors. While the current wisdom is that there is not a significant number of squashes for smaller atomic regions, we observe this is not the case for many multithreaded workloads. With region sizes of just 200--500 instructions, we observe a performance degradation ranging from 10% to more than 50% for workloads with a mixture of shared reads and writes. By harnessing the unique flexibility provided by the software subsystem of hybrid processor design, we present BlockChop , a framework for dynamically mitigating squashes on multicore hybrid processors. We present a range of squash handling mechanisms leveraging retrials, interpretation, and retranslation, and find that BlockChop is quite effective. Over the current response to exceptions and squashes in a hybrid design, we are able to improve the performance of benchmark and commercial workloads by 1.4x and 1.2x on average for large and small region sizes respectively." @default.
• W2143194988 created "2016-06-24" @default.
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• W2143194988 date "2012-09-05" @default.
• W2143194988 modified "2023-09-25" @default.
• W2143194988 title "BlockChop" @default.
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• W2143194988 doi "https://doi.org/10.1145/2366231.2337221" @default.
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