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Ашихмин Даниил. SEQ-MPI. Сумма элементов вектора. Вариант 1. #114
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Ашихмин Даниил. SEQ-MPI. Сумма элементов вектора. Вариант 1. #114
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## master #114 +/- ##
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+ Coverage 94.03% 94.56% +0.53%
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Files 15 17 +2
Lines 486 534 +48
Branches 181 196 +15
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+ Hits 457 505 +48
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aobolensk
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Описание
Последовательная(SEQ) - линейный однопроходный алгоритма, который проходит по всем элементам вектора и прибавляет их к значению суммы. Этот проход прост, не требует дополнительной памяти и обеспечивает корректный результат для любого размера вектора.
Параллельная версия(MPI) - использует распределение вектора между MPI-процессами.
2.1. Основная логика MPI-решения:
2.2. Вектор делится на равные части, каждая часть передается соответствующему процессу с помощью MPI_Scatterv.
2.3. Каждый процесс вычисляет локальную сумму элементов своей части вектора.
2.4. Финальная сумма всех элементов вектора получается с помощью коллективной операции MPI_Allreduce(&local_sum, &global_sum, 1, MPI_LONG_LONG, MPI_SUM, MPI_COMM_WORLD);
2.5. Эта операция суммирует локальные результаты всех процессов и возвращает итоговый результат на каждом ранге.
Такое решение обеспечивает корректность, отсутствие гонок, равномерное распределение нагрузки между процессами и масштабируемость при увеличение числа процессов.
Чек-лист
<фамилия>_<первая_буква_имени>_<короткое_название_задачи>clang-formatлокально в моем форке (нет ошибок форматирования)clang-tidyлокально в моем форке (нет предупреждений/ошибок)nesterov_a_vector_sum), а не вmaster