5. Consider the following code segment of an MPI program and answer the following question. int rank, tag=1; MPI Status Stat; MPI Init(&axgc, &axgv); MPI Comm rank (MPI_COMM_WORLD, &rank); int x = rank + 1; if (rank == 0) { proc = 1; MPI Recv(&x, 1, MPI_INT, proc, tag, MPI_COMM_WORLD, &Stat); x = x + 5; MPI Send (&x, 1, MPI_INT, proc, tag, MPI_COMM_WORLD); x = x + 2* rank; } else if (rank == 1) { proc = 0; MPI Send (&x, 1, MPI_INT, proc, tag, MPI_COMM_WORLD); x = x + 3; MPI Recv(&x, 1, MPI_INT, proc, tag, MPI_COMM_WORLD, &Stat); X = x + 2*rank; printf("Task %d: Received %d"\n", rank, x); } If the above program is run using 3 processors, what is the output? Write down the output that will be shown in the standard output (output generated by the printf statement). |
5. Consider the following code segment of an MPI program and answer the following question. int rank, tag=1; MPI Status Stat; MPI Init(&axgc, &axgv); MPI Comm rank (MPI_COMM_WORLD, &rank); int x = rank + 1; if (rank == 0) { proc = 1; MPI Recv(&x, 1, MPI_INT, proc, tag, MPI_COMM_WORLD, &Stat); x = x + 5; MPI Send (&x, 1, MPI_INT, proc, tag, MPI_COMM_WORLD); x = x + 2* rank; } else if (rank == 1) { proc = 0; MPI Send (&x, 1, MPI_INT, proc, tag, MPI_COMM_WORLD); x = x + 3; MPI Recv(&x, 1, MPI_INT, proc, tag, MPI_COMM_WORLD, &Stat); X = x + 2*rank; printf("Task %d: Received %d"\n", rank, x); } If the above program is run using 3 processors, what is the output? Write down the output that will be shown in the standard output (output generated by the printf statement). |
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Transcribed Image Text:5. Consider the following code segment of an MPI program and answer the following question.
int rank, tag=1;
MPI Status Stat;
MPI Init(&argc, &argv);
MPI Comm rank (MPI_COMM_WORLD, &rank);
int x = rank + 1;
if (rank
}
}
==
0) {
proc = 1;
MPI Recv(&x, 1, MPI_INT, proc, tag, MPI_COMM_WORLD, &Stat);
x = x + 5;
MPI Send (&x, 1, MPI_INT, proc, tag, MPI_COMM_WORLD);
x = x + 2* rank;
else if (rank
proc = 0;
MPI Send (&x, 1, MPI_INT, proc, tag, MPI_COMM_WORLD);
x = x + 3;
==
Answer:
1) {
MPIR
Recv(&x, 1, MPI_INT, proc, tag, MPI_COMM_WORLD, & Stat);
x = x + 2* rank;
printf("Task %d: Received %d"\n", rank, x);
If the above program is run using 3 processors, what is the output? Write down the output that
will be shown in the standard output (output generated by the printf statement).
I
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