Suppose that MPI_COMM_WORLD consists of the eight processes 0, 1, 2, 3, 4, 5, 6, and 7, and suppose the following code is executed: int sum = my_sum; int iLevel = 0; MPI_Status status; for (int stride = 1; stride < p; stride *= 2){ if (rank % stride == 0){//this process should be active int temp = 0; if (rank % stride * 2 == 0){//this process should be the receiver int source = rank + stride; MPI_Recv(&temp, 1, MPI_INT, source, iLevel, MPI_COMM_WORLD, &status); sum += temp; } else{ int dest = rank - stride; MPI_Send(&my_sum, 1, MPI_INT, dest, iLevel, MPI_COMM_WORLD); } } iLevel++; How many processes are involved and active in the second iteration of the for loop?

Suppose that MPI_COMM_WORLD consists of the eight processes 0, 1, 2, 3, 4, 5, 6, and 7, and suppose the following code is executed: int sum = my_sum; int iLevel = 0; MPI_Status status; for (int stride = 1; stride < p; stride = 2){ if (rank % stride == 0){//this process should be active int temp = 0; if (rank % stride 2 == 0){//this process should be the receiver int source = rank + stride; MPI_Recv(&temp, 1, MPI_INT, source, iLevel, MPI_COMM_WORLD, &status); sum += temp; } else{ int dest = rank - stride; MPI_Send(&my_sum, 1, MPI_INT, dest, iLevel, MPI_COMM_WORLD); } } iLevel++; How many processes are involved and active in the second iteration of the for loop?

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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