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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
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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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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