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Large-scale Ultrasound Simulations using Accelerated Clusters Vaverka, Filip ; Boehm, Christian (referee) ; Říha, Lubomír (referee) ; Jaroš, Jiří (advisor) Efektivní využití akcelerovaných HPC clusterů je obzvlášť závislé na efektivitě komunikace použitých algoritmů. Tato práce se tedy věnuje přezkoumání pseudo-spektrálních algorimů používaných pro řešení vlnových problémů převážně v oblasti medicínského ultrazvuku s cílem umožnit jejich běh na akcelerovaných strojích. Je ukázáno, že doménová dekompozice je preferovaný způsob dosažení daného cíle, jelikož řada alternativních přístupů vykazuje výrazně horší numerické vlastnosti. Na základě tohoto přístupu a k-Wave modelu ultrazvuku, široce používaného v medicíně, je navržen nový simulační algoritmus. Následnými experimenty je ukázáno, že tento přístup dosahuje až 7.5x zrychlení a dosahuje téměř perfektního slabého škálování až do 512 GPU akcelerovaných uzlů. Zároveň toto řešení umožňuje plné využití výpočetních uzlů s několika GPU akcelerátory a pokročilým propojením jako je NVIDIA DGX-2 s NVLink. Tato metoda také nabízí možnost flexibilní volby mezi přesností a efektivitou. Volbou hloubky překryvu subdomén lze dosáhnout jak přesnosti srovnatelné s původní k-Space metodou, tak i maximalizovat výkon při zachování dostatečné přesnosti. Detailed record

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