REShENIE ZADACh O MNOGOTOVARNYKh SETEVYKh POTOKAKh BOL'ShOY RAZMERNOSTI NA GRAFIChESKIKh PROTsESSORAKh

Мұқаба

Дәйексөз келтіру

Толық мәтін

Ашық рұқсат Ашық рұқсат
Рұқсат жабық Рұқсат берілді
Рұқсат жабық Рұқсат ақылы немесе тек жазылушылар үшін

Аннотация

Рассматривается задача о многотоварных сетевых потоках из всех пар узлов в сети с ребрами, имеющими заданные пропускные способности. При обычном подходе для каждой пары узлов “источник–назначение” на каждом ребре отслеживается отдельный поток. В статье используется более эффективная формулировка, в которой потоки с одним и тем же узлом-назначением объединяются, что позволяет уменьшить количество переменных в k раз, где k – размер сети. Задачи с сотнями узлов, с общим числом переменных порядка миллиона, могут быть решены стандартными общими методами внутренней точки на центральных процессорах (CPU); ниже используются совместимые с графическими процессорами (GPU) алгоритмы, которые могут решать такие задачи гораздо быстрее и, кроме того, масштабируются на гораздо большие задачи, с миллиардом переменных. Представленный метод основан на прямо-двойственном гибридном градиентном алгоритме и использует несколько особенностей задачи для эффективных вычислений на GPU. С помощью численных экспериментов показано, что прямо-двойственный метод многотоварных сетевых потоков ускоряет современные коммерческие решатели от 100 до 1000 раз и масштабируется на задачи гораздо большего размера. Приведена реализация данного метода с открытым исходным кодом.

Авторлар туралы

F. ChZhAN

Email: zfzhao@stanford.edu

S. BOYD

Email: boyd@stanford.edu

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