Point out a deadlock problem and make minor revision to avoid the deadlock: int a[10], b[10], myrank; MPI_Status status; ... MPI_Comm_rank(MPI_COMM_WORLD, &myrank); if (myrank == 0) { MPI_Send(a, 10, MPI_INT, 1, 1, MPI_COMM_WORLD); MPI_Send(b, 10, MPI_INT, 1, 2, MPI_COMM_WORLD); } else if (myrank == 1) { MPI_Recv(b, 10, MPI_INT, 0, 2, &status, MPI_COMM_WORLD); MPI_Recv(a, 10, MPI_INT, 0, 1, &status, MPI_COMM_WORLD); } ...
Point out a deadlock problem and make minor revision to avoid the deadlock: int a[10], b[10], myrank; MPI_Status status; ... MPI_Comm_rank(MPI_COMM_WORLD, &myrank); if (myrank == 0) { MPI_Send(a, 10, MPI_INT, 1, 1, MPI_COMM_WORLD); MPI_Send(b, 10, MPI_INT, 1, 2, MPI_COMM_WORLD); } else if (myrank == 1) { MPI_Recv(b, 10, MPI_INT, 0, 2, &status, MPI_COMM_WORLD); MPI_Recv(a, 10, MPI_INT, 0, 1, &status, MPI_COMM_WORLD); } ...
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
Related questions
Question
Point out a deadlock problem and make minor revision to avoid the deadlock:
int a[10], b[10], myrank;
MPI_Status status;
...
MPI_Comm_rank(MPI_COMM_WORLD, &myrank);
if (myrank == 0) {
MPI_Send(a, 10, MPI_INT, 1, 1, MPI_COMM_WORLD);
MPI_Send(b, 10, MPI_INT, 1, 2, MPI_COMM_WORLD);
}
else if (myrank == 1) {
MPI_Recv(b, 10, MPI_INT, 0, 2, &status, MPI_COMM_WORLD); MPI_Recv(a, 10, MPI_INT, 0, 1, &status, MPI_COMM_WORLD);
}
...
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