/usr/include/flann/mpi/server.h is in libflann-dev 1.8.4-3.
This file is owned by root:root, with mode 0o644.
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* Software License Agreement (BSD License)
*
* Copyright 2008-2011 Marius Muja (mariusm@cs.ubc.ca). All rights reserved.
* Copyright 2008-2011 David G. Lowe (lowe@cs.ubc.ca). All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*************************************************************************/
#ifndef MPI_SERVER_H_
#define MPI_SERVER_H_
#include <flann/mpi/index.h>
#include <stdio.h>
#include <time.h>
#include <cstdlib>
#include <iostream>
#include <boost/bind.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/asio.hpp>
#include <boost/thread/thread.hpp>
#include "queries.h"
namespace flann {
namespace mpi {
template<typename Distance>
class Server
{
typedef typename Distance::ElementType ElementType;
typedef typename Distance::ResultType DistanceType;
typedef boost::shared_ptr<tcp::socket> socket_ptr;
typedef flann::mpi::Index<Distance> FlannIndex;
void session(socket_ptr sock)
{
boost::mpi::communicator world;
try {
Request<ElementType> req;
if (world.rank()==0) {
read_object(*sock,req);
std::cout << "Received query\n";
}
// broadcast request to all MPI processes
boost::mpi::broadcast(world, req, 0);
Response<DistanceType> resp;
if (world.rank()==0) {
int rows = req.queries.rows;
int cols = req.nn;
resp.indices = flann::Matrix<int>(new int[rows*cols], rows, cols);
resp.dists = flann::Matrix<DistanceType>(new DistanceType[rows*cols], rows, cols);
}
std::cout << "Searching in process " << world.rank() << "\n";
index_->knnSearch(req.queries, resp.indices, resp.dists, req.nn, flann::SearchParams(req.checks));
if (world.rank()==0) {
std::cout << "Sending result\n";
write_object(*sock,resp);
}
delete[] req.queries.ptr();
if (world.rank()==0) {
delete[] resp.indices.ptr();
delete[] resp.dists.ptr();
}
}
catch (std::exception& e) {
std::cerr << "Exception in thread: " << e.what() << "\n";
}
}
public:
Server(const std::string& filename, const std::string& dataset, short port, const IndexParams& params) :
port_(port)
{
boost::mpi::communicator world;
if (world.rank()==0) {
std::cout << "Reading dataset and building index...";
std::flush(std::cout);
}
index_ = new FlannIndex(filename, dataset, params);
index_->buildIndex();
world.barrier(); // wait for data to be loaded and indexes to be created
if (world.rank()==0) {
std::cout << "done.\n";
}
}
void run()
{
boost::mpi::communicator world;
boost::shared_ptr<boost::asio::io_service> io_service;
boost::shared_ptr<tcp::acceptor> acceptor;
if (world.rank()==0) {
io_service.reset(new boost::asio::io_service());
acceptor.reset(new tcp::acceptor(*io_service, tcp::endpoint(tcp::v4(), port_)));
std::cout << "Start listening for queries...\n";
}
for (;;) {
socket_ptr sock;
if (world.rank()==0) {
sock.reset(new tcp::socket(*io_service));
acceptor->accept(*sock);
std::cout << "Accepted connection\n";
}
world.barrier(); // everybody waits here for a connection
boost::thread t(boost::bind(&Server::session, this, sock));
t.join();
}
}
private:
FlannIndex* index_;
short port_;
};
} // namespace mpi
} // namespace flann
#endif // MPI_SERVER_H_
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