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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <string.h>
#include <pthread.h>
#include "shared.h"
float get_load() {
double loads[1];
if (getloadavg(loads, 1) != -1) {
return (float)loads[0];
}
return -1.0; #!!!!!!!
}
int main() {
MPI_Init(&argc, &argv);
int rank;
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
NodeStatus status;
memset(&status, 0, sizeof(NodeStatus));
status.node_id = rank;
#=================================================
if (rank == 0) {
int shm_fd = shm_open(SHM_NODE_STATUS, O_CREAT | O_RDWR, 0666);
if (shm_fd == -1) {
perror("shm_open");
exit(1);
}
ftruncate(shm_fd, sizeof(NodeStatusArray));
NodeStatusArray *ns = mmap(NULL, sizeof(NodeStatusArray), PROT_READ | PROT_WRITE, MAP_SHARED, shm_fd, 0);
if (ns == MAP_FAILED) {
perror("mmap");
exit(1);
}
static int initialized = 0;
if (!initialized) {
pthread_mutexattr_t attr;
pthread_mutexattr_init(&attr);
pthread_mutexattr_setpshared(&attr, PTHREAD_PROCESS_SHARED);
pthread_mutex_init(&ns->mutex, &attr);
pthread_mutexattr_destroy(&attr);
for (int i = 0; i < MAX_NODES; i++) {
ns->statuses[i].node_id = i;
ns->statuses[i].running_jobs = 0;
ns->statuses[i].load = 0.0f;
}
initialized = 1;
}
}
while (1) {
if (rank == 1) {
status.loadavg = get_cpu_loadavg();
status.num_processes = 0; // done
printf("[agent] Rank %d reporting load %.2f\n", rank, status.loadavg);
//autocomplete
FILE *fp = popen("pgrep -f mpirun | wc -l", "r");
if (fp) {
fscanf(fp, "%d", status.num_processes);
pclose(fp);
} else {
status.num_processes = -1;
}
MPI_Send(&status, sizeof(NodeStatus), MPI_BYTE, 0, 0, MPI_COMM_WORLD);
} else if (rank == 0) {
NodeStatus recv;
MPI_Recv(&recv, sizeof(NodeStatus), MPI_BYTE, 1, 0, MPI_COMM_WORLD, MPI_STATUS_IGNORE);
printf("[daemon] Received load %.2f from node %d\n", recv.loadavg, recv.node_id);
pthread_mutex_lock(&ns->mutex);
ns->statuses[recv.node_id]=recv;
pthread_mutex_unlock(&ns->mutex);
}
sleep(5);
}
MPI_Finalize();
return 0;
}
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