void collect_data(mpi::communicator local, mpi::communicator world)
{
// The rank of the collector within the world communicator
int master_collector = world.size() - local.size();
if (world.rank() == master_collector) {
while (true) {
// Wait for a message
mpi::status msg = world.probe();
if (msg.tag() == msg_data_packet) {
// Receive the packet of data
std::vector<int> data;
world.recv(msg.source(), msg.tag(), data);
// Tell each of the collectors that we'll be broadcasting some data
for (int dest = 1; dest < local.size(); ++dest)
local.send(dest, msg_broadcast_data, msg.source());
// Broadcast the actual data.
broadcast(local, data, 0);
} else if (msg.tag() == msg_finished) {
// Receive the message
world.recv(msg.source(), msg.tag());
// Tell each of the collectors that we're finished
for (int dest = 1; dest < local.size(); ++dest)
local.send(dest, msg_finished);
break;
}
}
} else {
while (true) {
// Wait for a message from the master collector
mpi::status msg = local.probe();
if (msg.tag() == msg_broadcast_data) {
// Receive the broadcast message
int originator;
local.recv(msg.source(), msg.tag(), originator);
// Receive the data broadcasted from the master collector
std::vector<int> data;
broadcast(local, data, 0);
std::cout << "Collector #" << local.rank()
<< " is processing data from generator #" << originator
<< "." << std::endl;
} else if (msg.tag() == msg_finished) {
// Receive the message
local.recv(msg.source(), msg.tag());
break;
}
}
}
}
// Prijem a zpracovani prichozich zprav ve stavu, kdy proces nema praci
void inactiveRecvLoop() {
string recvMsg;
while (true) {
// Blokujici cekani dokud neprijde zprava
mpi::status status = com.probe();
// Prisly data - hura do prace!
if (status.tag() == DATA) {
//cout << "inactive: recv data from " << status.source() << endl;
com.recv(status.source(), status.tag(), data.startString);
work();
}
// Pozadany proces nema zadnou praci na rozdani
// Posle se novy pozadavek o praci nahodnemu procesu
else if (status.tag() == NO_WORK) {
//cout << "inactive: recv no_work from " << status.source() << endl;
com.recv(status.source(), status.tag());
sendRequest();
}
// Prisel pozadavek o praci, sam ale zadnou nemam
else if (status.tag() == WORK_REQUEST) {
//cout << "inactive: recv work_req from " << status.source() << endl;
com.recv(status.source(), status.tag());
//cout << "Sending NO_WORK to " << status.source() << endl;
com.send(status.source(), NO_WORK);
}
// Prisel token, zpracovani se lisi podle toho, zda jsem master nebo slave proces
else if (status.tag() == TOKEN) {
bool isWhiteToken;
//cout << "inactive: recv token from " << status.source() << endl;
com.recv(status.source(), status.tag(), isWhiteToken);
if (handleToken(isWhiteToken)) {
return;
}
}
// Prislo oznameni o nalezeni nejake podsekvence
// Pokud je delsi nez moje nejlepsi nalezena, ulozim si ji
else if (status.tag() == FOUND) {
cout << "inactive: recv found from " << status.source() << endl;
com.recv(status.source(), status.tag(), recvMsg);
if (recvMsg.length() > myLongest.length()) {
myLongest = recvMsg;
}
}
// Nektery proces nasel nejlepsi vysledek, ulozim si ho a koncim cekani/praci
else if (status.tag() == FOUND_BEST) {
cout << "inactive: recv found best from " << status.source() << endl;
com.recv(status.source(), status.tag(), myLongest);
return;
}
// Info od master procesu, ze vypocet uspesne skoncil - je mozne se vypnout
else if (status.tag() == END) {
//cout << "inactive: recv end from " << status.source() << endl;
return;
}
// Prisla zprava, kterou prave neumim zpracovat, vyzvednu a zahodim
else {
//cout << "inactive: recv from " << status.source() << endl;
com.recv(status.source(), status.tag());
}
}
}