#include "MpiBodyComm.hpp"
namespace nbody {
MpiBodyComm::MpiBodyComm() {
//setup initial data type and initialize request for tracking status of unblocking send
this->buffer.push_back(Body());
this->buffer.back().mass = 0.0;
this->datatypes[0] = MPI::DOUBLE;
this->datatypes[1] = MPI::DOUBLE;
this->datatypes[2] = MPI::DOUBLE;
this->blocklengths[0] = 3;
this->blocklengths[1] = 3;
this->blocklengths[2] = 1;
this->displacements[0] = MPI::Get_address(&(this->buffer[0].position[0]));
this->displacements[1] = MPI::Get_address(&(this->buffer[0].velocity[0]));
this->displacements[2] = MPI::Get_address(&(this->buffer[0].mass));
this->commBodyType = this->commBodyType.Create_struct(3, this->blocklengths, this->displacements, this->datatypes);
this->commBodyType.Commit();
this->request = MPI::REQUEST_NULL;
}
MpiBodyComm::~MpiBodyComm() {
if (this->request != MPI::REQUEST_NULL) {
//wait for termination of possibly open request
this->request.Wait();
this->request.Free();
}
this->commBodyType.Free();
}
void MpiBodyComm::setupDatatype(vector<Body> bodies) {
//re-setup data type for current input data's memory locations
this->commBodyType.Free();
this->displacements[0] = MPI::Get_address(&(bodies[0].position[0]));
this->displacements[1] = MPI::Get_address(&(bodies[0].velocity[0]));
this->displacements[2] = MPI::Get_address(&(bodies[0].mass));
this->commBodyType = this->commBodyType.Create_struct(3, this->blocklengths, this->displacements, this->datatypes);
this->commBodyType.Commit();
}
bool MpiBodyComm::sendBlocking(int target, vector<Body> bodies) {
if (this->request != MPI::REQUEST_NULL && !this->request.Test()) {
//unblocking send still not finished
return false;
}
this->setupDatatype(bodies);
MPI::COMM_WORLD.Send(&bodies[0], bodies.size(), this->commBodyType, target, 0);
return true;
}
bool MpiBodyComm::sendUnblocking(int target, vector<Body> bodies) {
if (this->request != MPI::REQUEST_NULL && !this->request.Test()) {
//unblocking send still not finished
return false;
}
//need buffering; method will return before send is finished
this->buffer = bodies;
this->setupDatatype(this->buffer);
this->request = MPI::COMM_WORLD.Isend(&this->buffer[0], this->buffer.size(), this->commBodyType, target, 0);
return true;
}
void MpiBodyComm::recvBlocking(int source, vector<Body>& bodies) {
MPI::Status status;
int count;
bodies.clear();
//wait for incoming message to determine number of bodies received
while (!MPI::COMM_WORLD.Iprobe(source, 0, status));
//get number of bodies to reserve memory
count = status.Get_count(this->commBodyType);
bodies.reserve(count);
MPI::COMM_WORLD.Recv(&bodies[0], count, this->commBodyType, source, 0);
}
bool MpiBodyComm::recvUnblocking(int source, vector<Body>& bodies) {
MPI::Status status;
int count;
//if message is not here return
if (!MPI::COMM_WORLD.Iprobe(source, 0, status)) {
return false;
}
bodies.clear();
//get number of bodies to reserve memory
count = status.Get_count(this->commBodyType);
bodies.reserve(count);
MPI::COMM_WORLD.Recv(&bodies[0], count, this->commBodyType, source, 0);
return true;
}
void MpiBodyComm::recvBlockingAnySource(int& source, vector<Body>& bodies) {
MPI::Status status;
int count;
int actualSource;
bodies.clear();
//wait for incoming message to determine number of bodies received
while (!MPI::COMM_WORLD.Iprobe(MPI::ANY_SOURCE, 0, status));
//get number of bodies to reserve memory and determine source
count = status.Get_count(this->commBodyType);
actualSource = status.Get_source();
bodies.reserve(count);
//set source
source = actualSource;
MPI::COMM_WORLD.Recv(&bodies[0], count, this->commBodyType, source, 0);
}
bool MpiBodyComm::recvUnblockingAnySource(int& source, vector<Body>& bodies) {
MPI::Status status;
int count;
int actualSource;
////if message is not here return
if (!MPI::COMM_WORLD.Iprobe(MPI::ANY_SOURCE, 0, status)) {
return false;
}
bodies.clear();
//get number of bodies to reserve memory and determine source
count = status.Get_count(this->commBodyType);
actualSource = status.Get_source();
bodies.reserve(count);
//set source
source = actualSource;
MPI::COMM_WORLD.Recv(&bodies[0], count, this->commBodyType, source, 0);
return true;
}
}