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//
// Created by tung on 6/18/15.
//
#include "MPIHelper.h"
#include "timeutil.h"
/**
* Initialize the single getInstance of MPIHelper
*/
MPIHelper& MPIHelper::getInstance() {
static MPIHelper instance;
#ifndef _IQTREE_MPI
instance.setProcessID(0);
instance.setNumProcesses(1);
#endif
return instance;
}
void MPIHelper::init(int argc, char *argv[]) {
#ifdef _IQTREE_MPI
int n_tasks, task_id;
if (MPI_Init(&argc, &argv) != MPI_SUCCESS) {
outError("MPI initialization failed!");
}
MPI_Comm_size(MPI_COMM_WORLD, &n_tasks);
MPI_Comm_rank(MPI_COMM_WORLD, &task_id);
setNumProcesses(n_tasks);
setProcessID(task_id);
setNumTreeReceived(0);
setNumTreeSent(0);
setNumNNISearch(0);
#endif
}
void MPIHelper::finalize() {
#ifdef _IQTREE_MPI
MPI_Finalize();
#endif
}
void MPIHelper::syncRandomSeed() {
#ifdef _IQTREE_MPI
unsigned int rndSeed;
if (MPIHelper::getInstance().isMaster()) {
rndSeed = Params::getInstance().ran_seed;
}
// Broadcast random seed
MPI_Bcast(&rndSeed, 1, MPI_INT, PROC_MASTER, MPI_COMM_WORLD);
if (MPIHelper::getInstance().isWorker()) {
// Params::getInstance().ran_seed = rndSeed + task_id * 100000;
Params::getInstance().ran_seed = rndSeed;
// printf("Process %d: random_seed = %d\n", task_id, Params::getInstance().ran_seed);
}
#endif
}
int MPIHelper::countSameHost() {
#ifdef _IQTREE_MPI
// detect if processes are in the same host
char host_name[MPI_MAX_PROCESSOR_NAME];
int resultlen;
int pID = MPIHelper::getInstance().getProcessID();
MPI_Get_processor_name(host_name, &resultlen);
char *host_names;
host_names = new char[MPI_MAX_PROCESSOR_NAME * MPIHelper::getInstance().getNumProcesses()];
MPI_Allgather(host_name, resultlen+1, MPI_CHAR, host_names, MPI_MAX_PROCESSOR_NAME, MPI_CHAR,
MPI_COMM_WORLD);
int count = 0;
for (int i = 0; i < MPIHelper::getInstance().getNumProcesses(); i++)
if (strcmp(&host_names[i*MPI_MAX_PROCESSOR_NAME], host_name) == 0)
count++;
delete [] host_names;
if (count>1)
cout << "NOTE: " << count << " processes are running on the same host " << host_name << endl;
return count;
#else
return 1;
#endif
}
bool MPIHelper::gotMessage() {
// Check for incoming messages
if (getNumProcesses() == 1)
return false;
#ifdef _IQTREE_MPI
int flag = 0;
MPI_Status status;
MPI_Iprobe(MPI_ANY_SOURCE, MPI_ANY_TAG, MPI_COMM_WORLD, &flag, &status);
if (flag)
return true;
else
return false;
#else
return false;
#endif
}
#ifdef _IQTREE_MPI
void MPIHelper::sendString(string &str, int dest, int tag) {
char *buf = (char*)str.c_str();
MPI_Send(buf, str.length()+1, MPI_CHAR, dest, tag, MPI_COMM_WORLD);
}
void MPIHelper::sendCheckpoint(Checkpoint *ckp, int dest) {
stringstream ss;
ckp->dump(ss);
string str = ss.str();
sendString(str, dest, TREE_TAG);
}
int MPIHelper::recvString(string &str, int src, int tag) {
MPI_Status status;
MPI_Probe(src, tag, MPI_COMM_WORLD, &status);
int msgCount;
MPI_Get_count(&status, MPI_CHAR, &msgCount);
// receive the message
char *recvBuffer = new char[msgCount];
MPI_Recv(recvBuffer, msgCount, MPI_CHAR, status.MPI_SOURCE, status.MPI_TAG, MPI_COMM_WORLD, &status);
str = recvBuffer;
delete [] recvBuffer;
return status.MPI_SOURCE;
}
int MPIHelper::recvCheckpoint(Checkpoint *ckp, int src) {
string str;
int proc = recvString(str, src, TREE_TAG);
stringstream ss(str);
ckp->load(ss);
return proc;
}
void MPIHelper::broadcastCheckpoint(Checkpoint *ckp) {
int msgCount = 0;
stringstream ss;
string str;
if (isMaster()) {
ckp->dump(ss);
str = ss.str();
msgCount = str.length()+1;
}
// broadcast the count for workers
MPI_Bcast(&msgCount, 1, MPI_INT, PROC_MASTER, MPI_COMM_WORLD);
char *recvBuffer = new char[msgCount];
if (isMaster())
memcpy(recvBuffer, str.c_str(), msgCount);
// broadcast trees to workers
MPI_Bcast(recvBuffer, msgCount, MPI_CHAR, PROC_MASTER, MPI_COMM_WORLD);
if (isWorker()) {
ss.clear();
ss.str(recvBuffer);
ckp->load(ss);
}
delete [] recvBuffer;
}
void MPIHelper::gatherCheckpoint(Checkpoint *ckp) {
stringstream ss;
ckp->dump(ss);
string str = ss.str();
int msgCount = str.length();
// first send the counts to MASTER
int *msgCounts = NULL, *displ = NULL;
char *recvBuffer = NULL;
int totalCount = 0;
if (isMaster()) {
msgCounts = new int[getNumProcesses()];
displ = new int[getNumProcesses()];
}
MPI_Gather(&msgCount, 1, MPI_INT, msgCounts, 1, MPI_INT, PROC_MASTER, MPI_COMM_WORLD);
// now real contents to MASTER
if (isMaster()) {
for (int i = 0; i < getNumProcesses(); i++) {
displ[i] = totalCount;
totalCount += msgCounts[i];
}
recvBuffer = new char[totalCount+1];
memset(recvBuffer, 0, totalCount+1);
}
char *buf = (char*)str.c_str();
MPI_Gatherv(buf, msgCount, MPI_CHAR, recvBuffer, msgCounts, displ, MPI_CHAR, PROC_MASTER, MPI_COMM_WORLD);
if (isMaster()) {
// now decode the buffer
ss.clear();
ss.str(recvBuffer);
ckp->load(ss);
delete [] recvBuffer;
delete [] displ;
delete [] msgCounts;
}
}
#endif
MPIHelper::~MPIHelper() {
// cleanUpMessages();
}
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