1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66 | #include <mpi.h>
#include <unistd.h>
#include <cstdlib>
#include <iostream>
#include <stdexcept>
#define fail(msg) throw std::runtime_error(msg)
void simulate_relay_race(int argc, char* argv[], int process_number
, int process_count);
void run_stage1(int stage1_delay, int process_number, int team_count);
void run_stage2(int stage2_delay, int process_number, int team_count);
int main(int argc, char* argv[]) {
int error = EXIT_SUCCESS;
if (MPI_Init(&argc, &argv) == MPI_SUCCESS) {
try {
int process_number = -1;
MPI_Comm_rank(MPI_COMM_WORLD, &process_number);
int process_count = -1;
MPI_Comm_size(MPI_COMM_WORLD, &process_count);
char process_hostname[MPI_MAX_PROCESSOR_NAME] = { '\0' };
int hostname_length = -1;
MPI_Get_processor_name(process_hostname, &hostname_length);
simulate_relay_race(argc, argv, process_number, process_count);
} catch (const std::runtime_error& exception) {
std::cout << exception.what() << std::endl;
error = EXIT_FAILURE;
}
MPI_Finalize();
} else {
std::cerr << "error: could not init MPI" << std::endl;
error = EXIT_FAILURE;
}
return error;
}
void simulate_relay_race(int argc, char* argv[], int process_number
, int process_count) {
if (argc == 3) {
if (process_count >= 2) {
const int team_count = process_count / 2;
const int stage1_delay = atoi(argv[1]);
const int stage2_delay = atoi(argv[2]);
run_stage1(stage1_delay, process_number, team_count);
run_stage2(stage2_delay, process_number, team_count);
} else {
fail("error: two or more of processes required");
}
} else {
fail("usage: relay_race_dist stage1_delay stage2_delay");
}
}
void run_stage1(int stage1_delay, int process_number, int team_count) {
usleep(1000 * stage1_delay);
}
void run_stage2(int stage2_delay, int process_number, int team_count) {
usleep(1000 * stage2_delay);
}
|