Abstract
The rapid development of novel procedures in medical ultrasonics, including treatment planning in therapeutic ultrasound and image reconstruction in photoacoustic tomography, leads to increasing demand for large-scale ultrasound simulations. However, routine execution of such simulations using traditional methods, e.g., finite difference time domain, is expensive and often considered intractable due to the computational and memory requirements. The k-space corrected pseudospectral time domain method used by the k-Wave toolbox allows for significant reductions in spatial and temporal grid resolution. These improvements are achieved at the cost of all-to-all communication, which are inherent to the multi-dimensional fast Fourier transforms. To improve data locality, reduce communication and allow efficient use of accelerators, we recently implemented a domain decomposition technique based on a local Fourier basis.
In this paper, we investigate whether it is feasible to run the distributed k-Wave implementation on the Salomon cluster equipped with 864 Intel Xeon Phi (Knight’s Corner) accelerators. The results show the immaturity of the KNC platform with issues ranging from limited support of Infiniband and LustreFS in Intel MPI on this platform to poor performance of 3D FFTs achieved by Intel MKL on the KNC architecture. Yet, we show that it is possible to achieve strong and weak scaling comparable to CPU-only platforms albeit with the runtime \(1.8\times \) to \(4.3\times \) longer. However, the accounting policy for Salomon’s accelerators is far more favorable and thus their employment reduces the computational cost significantly.
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Acknowledgement
This work was supported by The Ministry of Education, Youth and Sports from the National Programme of Sustainability (NPU II) project “IT4Innovations excellence in science - LQ1602” and by the IT4Innovations infrastructure which is supported from the Large Infrastructures for Research, Experimental Development and Innovations project “IT4Innovations National Supercomputing Center - LM2015070”. This project has received funding from the European Union’s Horizon 2020 research and innovation programme H2020 ICT 2016–2017 under grant agreement No. 732411 and is an initiative of the Photonics Public Private Partnership. This work was further supported in part by the Engineering and Physical Sciences Research Council (EPRSC), UK, grant numbers EP/L020262/1 and EP/S026371/1.
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Vaverka, F., Treeby, B.E., Jaros, J. (2021). Performance Evaluation of Pseudospectral Ultrasound Simulations on a Cluster of Xeon Phi Accelerators. In: Kozubek, T., Arbenz, P., Jaroš, J., Říha, L., Šístek, J., Tichý, P. (eds) High Performance Computing in Science and Engineering. HPCSE 2019. Lecture Notes in Computer Science(), vol 12456. Springer, Cham. https://doi.org/10.1007/978-3-030-67077-1_6
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