+void process::load_balance_loop()
+{
+ using std::placeholders::_1;
+
+ double next_iter_after_date = MSG_get_clock() + opt::min_lb_iter_duration;
+ while (still_running()) {
+ if (lb_iter == opt::comp_iter_delay) {
+ mutex.acquire();
+ ++lb_iter;
+ cond.signal();
+ mutex.release();
+ } else {
+ ++lb_iter;
+ }
+
+ ctrl_receive(0.0);
+
+ mutex.acquire();
+ if (!opt::bookkeeping)
+ expected_load = real_load - get_sum_of_to_send();
+ // nothing to do with opt::bookkeeping
+
+ if (opt::log_rate && lb_iter % opt::log_rate == 0) {
+ XBT_INFO("(%u:%u) current load: %g", lb_iter, comp_iter, real_load);
+ XBT_VERB("... expected load: %g", expected_load);
+ }
+
+ if (expected_load > 0.0)
+ load_balance();
+
+ print_loads(true, xbt_log_priority_debug);
+
+ // send
+ comm.ctrl_flush(false);
+ std::for_each(neigh.begin(), neigh.end(),
+ std::bind(&process::ctrl_send, this, _1));
+ prev_load_broadcast = expected_load;
+ mutex.release();
+
+ sleep_until_date(next_iter_after_date, opt::min_lb_iter_duration);
+ }
+
+ XBT_VERB("Going to finalize for %s...", __func__);
+ XBT_DEBUG("send CTRL_CLOSE to %zu neighbor%s",
+ neigh.size(), ESSE(neigh.size()));
+ std::for_each(neigh.begin(), neigh.end(),
+ std::bind(&process::ctrl_close, this, _1));
+ while (ctrl_close_pending) {
+ comm.ctrl_flush(false);
+ XBT_DEBUG("waiting for %d CTRL_CLOSE", ctrl_close_pending);
+ ctrl_receive(-1.0);
+ }
+ comm.ctrl_flush(true);
+}
+
+void process::compute_loop()
+{
+ using std::placeholders::_1;
+
+ double next_iter_after_date = MSG_get_clock() + opt::min_comp_iter_duration;
+ while (still_running()) {
+ // receive (do not block if there is something to compute)
+ data_receive(real_load > 0.0 ? 0.0 : opt::min_comp_iter_duration);
+
+ // send
+ comm.data_flush(false);
+ mutex.acquire();
+ real_load += received_load;
+ received_load = 0.0;
+ std::for_each(neigh.begin(), neigh.end(),
+ std::bind(&process::data_send, this, _1));
+ mutex.release();
+
+ if (real_load == 0.0)
+ continue;
+
+ // compute
+ ++comp_iter;
+ double flops = opt::comp_cost(real_load);
+ m_task_t task = MSG_task_create("computation", flops, 0.0, NULL);
+ TRACE_msg_set_task_category(task, TRACE_CAT_COMP);
+ XBT_DEBUG("compute %g flop%s", flops, ESSE(flops));
+ MSG_task_execute(task);
+ add_comp_amount(flops);
+ MSG_task_destroy(task);
+
+ sleep_until_date(next_iter_after_date, opt::min_comp_iter_duration);
+ }
+
+ XBT_VERB("Going to finalize for %s...", __func__);
+ finalizing = true;
+ XBT_DEBUG("send DATA_CLOSE to %zu neighbor%s",
+ neigh.size(), ESSE(neigh.size()));
+ std::for_each(neigh.begin(), neigh.end(),
+ std::bind(&process::data_close, this, _1));
+ while (data_close_pending) {
+ comm.data_flush(false);
+ XBT_DEBUG("waiting for %d DATA_CLOSE", data_close_pending);
+ data_receive(-1.0);
+ }
+ real_load += received_load;
+ received_load = 0.0;
+ total_load_running -= real_load;
+ comm.data_flush(true);
+}
+
+bool process::still_running()
+{
+ static bool last_status = true;
+
+ if (!last_status) {
+ /* nop */
+
+ } else if (opt::exit_request) {
+ XBT_VERB("Global exit requested");
+ last_status = false;
+
+ } else if (opt::time_limit && MSG_get_clock() >= opt::time_limit) {
+ XBT_VERB("Reached time limit: %g/%g", MSG_get_clock(), opt::time_limit);
+ last_status = false;
+
+ } else if (opt::lb_maxiter && lb_iter >= opt::lb_maxiter) {
+ XBT_VERB("Reached lb_maxiter: %d/%d", lb_iter, opt::lb_maxiter);
+ last_status = false;
+
+ } else if (opt::comp_maxiter && comp_iter >= opt::comp_maxiter) {
+ XBT_VERB("Reached comp_maxiter: %d/%d", comp_iter, opt::comp_maxiter);
+ last_status = false;
+
+ } else if (opt::exit_on_close && close_received) {
+ XBT_VERB("Close received");
+ last_status = false;
+
+ } else if (real_load == 0.0 && !data_close_pending) {
+ XBT_VERB("I'm a poor lonesome process, and I have no load...");
+ last_status = false;
+
+ } else if (100.0 * total_load_running / total_load_init <=
+ opt::load_ratio_threshold) {
+ // fixme: this check should be implemented with a distributed
+ // algorithm, and not a shared global variable!
+ XBT_VERB("No more load to balance in system.");
+ last_status = false;
+ }
+
+ return last_status;
+}
+
+double process::get_sum_of_to_send() const
+{
+ using std::placeholders::_1;
+ using std::placeholders::_2;
+
+ return std::accumulate(neigh.begin(), neigh.end(), 0.0,
+ std::bind(std::plus<double>(), _1,
+ std::bind(&neighbor::get_to_send, _2)));
+}
+
+void process::load_balance()
+{
+ if (lb_iter == 1) // warn only once
+ XBT_WARN("process::load_balance() is a no-op!");
+}
+
+void process::send(neighbor& nb, double amount)
+{
+ expected_load -= amount;
+ nb.set_to_send(nb.get_to_send() + amount);
+ nb.set_load(nb.get_load() + amount);
+}
+
+void process::ctrl_send(neighbor& nb)
+{
+ double info_to_send = expected_load;
+ double debt_to_send;
+ if (opt::bookkeeping) { // bookkeeping
+ debt_to_send = nb.get_to_send();
+ if (debt_to_send > 0.0) {
+ nb.set_to_send(0.0);
+ nb.set_debt(nb.get_debt() + debt_to_send);
+ }
+ } else { // !bookkeeping
+ debt_to_send = 0.0;
+ }
+ if (info_to_send != prev_load_broadcast || debt_to_send > 0.0) {
+ message* msg = new message(message::CTRL, info_to_send, debt_to_send);
+ add_ctrl_send_mesg(msg->get_size());
+ comm.ctrl_send(nb.get_ctrl_mbox(), msg);
+ }
+}
+
+double process::compute_load_to_send(double desired)
+{
+ if (opt::integer_transfer)
+ desired = std::floor(desired);
+ return desired >= opt::min_transfer_amount ? desired : 0.0;
+}
+
+void process::data_send(neighbor& nb)
+{
+ double load_to_send;
+ if (opt::bookkeeping) { // bookkeeping
+ double excess_load; // load amount we are able to send
+ if (opt::egocentric)
+ excess_load = std::max(0.0, real_load - expected_load);
+ else
+ excess_load = real_load;
+
+ double balance = nb.get_debt() - nb.get_credit();
+ load_to_send = std::min(excess_load,
+ std::max(0.0, balance));
+
+ // adjust load to send (rounding, truncation, etc.)
+ load_to_send = compute_load_to_send(load_to_send);
+ if (load_to_send > 0.0)
+ nb.set_debt(nb.get_debt() - load_to_send);
+ } else { // !bookkeeping
+ load_to_send = compute_load_to_send(nb.get_to_send());
+ if (load_to_send > 0.0)
+ nb.set_to_send(nb.get_to_send() - load_to_send);
+ }
+ real_load -= load_to_send;
+ while (load_to_send > 0.0) {
+ double amount;
+ if (opt::max_transfer_amount)
+ amount = std::min(load_to_send, opt::max_transfer_amount);
+ else
+ amount = load_to_send;
+ message* msg = new message(message::DATA, amount);
+ add_data_send_mesg(msg->get_size());
+ comm.data_send(nb.get_data_mbox(), msg);
+ load_to_send -= amount;
+ }
+}
+
+void process::ctrl_close(neighbor& nb)
+{
+ comm.ctrl_send(nb.get_ctrl_mbox(), new message(message::CTRL_CLOSE, 0.0));
+}
+
+void process::data_close(neighbor& nb)
+{
+ comm.data_send(nb.get_data_mbox(), new message(message::DATA_CLOSE, 0.0));
+}
+
+void process::ctrl_receive(double timeout)
+{
+ message* msg;
+ m_host_t from;
+
+ XBT_DEBUG("%sblocking receive on ctrl (%g)", "\0non-" + !timeout, timeout);
+ while (ctrl_close_pending && comm.ctrl_recv(msg, from, timeout)) {
+ if (msg->get_type() != message::CTRL_CLOSE)
+ add_ctrl_recv_mesg(msg->get_size());
+ handle_message(msg, from);
+ timeout = 0.0;
+ }
+}
+
+void process::data_receive(double timeout)
+{
+ message* msg;
+ m_host_t from;
+
+ XBT_DEBUG("%sblocking receive on data (%g)", "\0non-" + !timeout, timeout);
+ while (data_close_pending && comm.data_recv(msg, from, timeout)) {
+ if (msg->get_type() != message::DATA_CLOSE)
+ add_data_recv_mesg(msg->get_size());
+ handle_message(msg, from);
+ timeout = 0.0;
+ }
+}
+
+void process::handle_message(message* msg, m_host_t from)
+{
+ switch (msg->get_type()) {
+ case message::CTRL: {
+ neighbor* n = rev_neigh[from];
+ n->set_load(msg->get_amount() + n->get_to_send());
+ if (opt::bookkeeping) {
+ double credit = msg->get_credit();
+ expected_load += credit;
+ n->set_credit(n->get_credit() + credit);
+ }
+ break;
+ }
+ case message::DATA: {
+ neighbor* n = rev_neigh[from];
+ double ld = msg->get_amount();
+ received_load += ld;
+ n->set_credit(n->get_credit() - ld);
+ break;
+ }
+ case message::CTRL_CLOSE:
+ ctrl_close_pending--;
+ close_received = true;
+ break;
+ case message::DATA_CLOSE:
+ data_close_pending--;
+ close_received = true;
+ break;
+ }
+ delete msg;
+}
+
+#define print_loads_generic(vec, verbose, logp, cat) \
+ if (_XBT_LOG_ISENABLEDV((*cat), logp)) { \
+ using std::placeholders::_1; \
+ XBT_XCLOG(cat, logp, "My load: %g (real); %g (expected). " \
+ "Neighbor loads:", real_load, expected_load); \
+ std::for_each(vec.begin(), vec.end(), \
+ std::bind(&neighbor::print, _1, verbose, logp, cat)); \
+ } else ((void)0)
+
+void process::print_loads(bool verbose,
+ e_xbt_log_priority_t logp,
+ xbt_log_category_t cat) const
+{
+ print_loads_generic(neigh, verbose, logp, cat);
+}
+
+void process::print_loads_p(bool verbose,
+ e_xbt_log_priority_t logp,
+ xbt_log_category_t cat) const
+{
+ print_loads_generic(pneigh, verbose, logp, cat);
+}
+
+#undef print_loads_generic
+
