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Studies on the energy and deep memory behaviour of a cache-oblivious, task-based hyperbolic PDE solver

Charrier, D.E.; Hazelwood, B.; Tutlyaeva, E.; Bader, M.; Dumbser, M.; Kudryavtsev, A.; Moskovsky, A.; Weinzierl, T.

Studies on the energy and deep memory behaviour of a cache-oblivious, task-based hyperbolic PDE solver Thumbnail


Authors

D.E. Charrier

B. Hazelwood

E. Tutlyaeva

M. Bader

M. Dumbser

A. Kudryavtsev

A. Moskovsky



Abstract

We study the performance behaviour of a seismic simulation using the ExaHyPE engine with a specific focus on memory characteristics and energy needs. ExaHyPE combines dynamically adaptive mesh refinement (AMR) with ADER-DG. It is parallelized using tasks, and it is cache efficient. AMR plus ADER-DG yields a task graph which is highly dynamic in nature and comprises both arithmetically expensive tasks and tasks which challenge the memory’s latency. The expensive tasks and thus the whole code benefit from AVX vectorization, although we suffer from memory access bursts. A frequency reduction of the chip improves the code’s energy-to-solution. Yet, it does not mitigate burst effects. The bursts’ latency penalty becomes worse once we add Intel Optane technology, increase the core count significantly or make individual, computationally heavy tasks fall out of close caches. Thread overbooking to hide away these latency penalties becomes contra-productive with noninclusive caches as it destroys the cache and vectorization character. In cases where memory-intense and computationally expensive tasks overlap, ExaHyPE’s cache-oblivious implementation nevertheless can exploit deep, noninclusive, heterogeneous memory effectively, as main memory misses arise infrequently and slow down only few cores. We thus propose that upcoming supercomputing simulation codes with dynamic, inhomogeneous task graphs are actively supported by thread runtimes in intermixing tasks of different compute character, and we propose that future hardware actively allows codes to downclock the cores running particular task types.

Citation

Charrier, D., Hazelwood, B., Tutlyaeva, E., Bader, M., Dumbser, M., Kudryavtsev, A., …Weinzierl, T. (2019). Studies on the energy and deep memory behaviour of a cache-oblivious, task-based hyperbolic PDE solver. International Journal of High Performance Computing Applications, 33(5), 973-986. https://doi.org/10.1177/1094342019842645

Journal Article Type Article
Acceptance Date Mar 11, 2019
Online Publication Date Apr 15, 2019
Publication Date Sep 30, 2019
Deposit Date Mar 11, 2019
Publicly Available Date Apr 28, 2019
Journal International Journal of High Performance Computing Applications
Print ISSN 1094-3420
Electronic ISSN 1741-2846
Publisher SAGE Publications
Peer Reviewed Peer Reviewed
Volume 33
Issue 5
Pages 973-986
DOI https://doi.org/10.1177/1094342019842645
Related Public URLs https://arxiv.org/abs/1810.03940

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