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• W2126465370 abstract "Communication latencies within critical sections constitute a major bottleneck in some classes of emerging parallel workloads. In this paper, we argue for the use of Inferentially Queued Locks (IQLs) [31], not just for efficient synchronization but also for reducing communication latencies, and we propose a novel mechanism, Speculative Push (SP), aimed at reducing these communication latencies. With IQLs, the processor infers the existence, and limits, of a critical section from the use of synchronization instructions and joins a queue of lock requestors. The SP mechanism extracts information about program structure by observing IQLs. SP allows the cache controller, responding to a request for a cache line that likely includes a lock variable, to predict the data sets the requestor will modify within the associated critical section. The controller then pushes these lines from its own cache to the target cache, as well as writing them to memory. Overlapping the protected data transfer with that of the lock can substantially reduce the communication latencies within critical sections. By pushing data in exclusive state, the mechanism can collapse a read-modify-write sequences within a critical section into a single local cache access. The write-back to memory allows the receiving cache to ignore the push. Neither mechanism requires any programmer or compiler support nor any instruction set changes. Our experiments demonstrate that IQLs and SP can improve performance of applications employing frequent synchronization." @default.
• W2126465370 created "2016-06-24" @default.
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• W2126465370 date "2003-06-23" @default.
• W2126465370 modified "2023-10-17" @default.
• W2126465370 title "Inferential queueing and speculative push for reducing critical communication latencies" @default.
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• W2126465370 doi "https://doi.org/10.1145/782814.782853" @default.
• W2126465370 hasPublicationYear "2003" @default.
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