comp_iter = lb_iter = 0;
+ compute_thread = new_msg_thread("compute",
+ std::tr1::bind(&process::compute_loop,
+ this));
+
e_xbt_log_priority_t logp = xbt_log_priority_verbose;
if (!LOG_ISENABLED(logp))
return;
process::~process()
{
+ delete compute_thread;
total_load_exit += real_load;
if (opt::bookkeeping) {
XBT_INFO("Final load after %d:%d iterations: %g ; expected: %g",
int process::run()
{
- double next_iter_after_date = 0.0;
XBT_INFO("Initial load: %g", real_load);
XBT_VERB("Starting...");
- while (true) {
- if (get_load() > 0.0) {
- double now = MSG_get_clock();
- if (now < next_iter_after_date)
- MSG_process_sleep(next_iter_after_date - now);
- next_iter_after_date = MSG_get_clock() + opt::min_lb_iter_duration;
-
- ++lb_iter;
-
- if (opt::log_rate && lb_iter % opt::log_rate == 0) {
- if (opt::bookkeeping)
- XBT_INFO("(%u:%u) current load: %g ; expected: %g",
- lb_iter, comp_iter, real_load, expected_load);
- else
- XBT_INFO("(%u) current load: %g",
- lb_iter, real_load);
- }
+ compute_thread->start();
+ load_balance_loop();
+ compute_thread->wait();
+ XBT_VERB("Done.");
+ return 0;
+}
- load_balance();
+void process::load_balance_loop()
+{
+ using std::tr1::bind;
+ using std::tr1::placeholders::_1;
- print_loads(true, xbt_log_priority_debug);
- }
+ while (still_running()) {
+ ++lb_iter;
- // send load information, and load (data) if any
- send_all();
- if (real_load > 0.0) {
- ++comp_iter;
- compute();
+ if (opt::log_rate && lb_iter % opt::log_rate == 0) {
+ if (opt::bookkeeping)
+ XBT_INFO("(%u:%u) current load: %g ; expected: %g",
+ lb_iter, comp_iter, real_load, expected_load);
+ else
+ XBT_INFO("(%u:%u) current load: %g",
+ lb_iter, comp_iter, real_load);
}
- if (opt::lb_maxiter && lb_iter >= opt::lb_maxiter) {
- XBT_VERB("Reached lb_maxiter: %d/%d", lb_iter, opt::lb_maxiter);
- break;
- }
- if (opt::comp_maxiter && comp_iter >= opt::comp_maxiter) {
- XBT_VERB("Reached comp_maxiter: %d/%d", comp_iter, opt::comp_maxiter);
- break;
- }
- if (opt::time_limit && MSG_get_clock() >= opt::time_limit) {
- XBT_VERB("Reached time limit: %g/%g", MSG_get_clock(), opt::time_limit);
- break;
- }
+ if (get_load() > 0.0)
+ load_balance();
+
+ print_loads(true, xbt_log_priority_debug);
+
+ // send
+ std::for_each(neigh.begin(), neigh.end(),
+ bind(&process::ctrl_send, this, _1));
// block on receiving unless there is something to compute or
// to send
- double timeout;
- if (real_load != 0 || get_load() != prev_load_broadcast)
- timeout = 0.0;
- else if (opt::min_lb_iter_duration)
- timeout = opt::min_lb_iter_duration;
- else
- timeout = 1.0;
- receive(timeout);
-
- // one of our neighbor is finalizing
- if (opt::exit_on_close && close_received) {
- XBT_VERB("Close received");
- break;
- }
+ ctrl_receive(opt::min_lb_iter_duration);
- // have no load and cannot receive anything
- if (real_load == 0.0 && !may_receive()) {
- XBT_VERB("I'm a poor lonesome process, and I have no load...");
- break;
- }
-
- // fixme: this check should be implemented with a distributed
- // algorithm, and not a shared global variable!
- // fixme: should this chunk be moved before call to receive() ?
- if (100.0 * total_load_running / total_load_init <=
- opt::load_ratio_threshold) {
- XBT_VERB("No more load to balance in system.");
- break;
- } else {
- XBT_DEBUG("still %g load to balance, continuing...", total_load_running);
- }
+ comm.ctrl_flush(false);
}
- XBT_VERB("Going to finalize...");
- finalize();
-
- /* Open Questions :
- * - definition of load on heterogeneous hosts ?
- * - how to detect convergence ?
- * - how to manage link failures ?
- */
- XBT_VERB("Done.");
- return 0;
+ 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(),
+ 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::load_balance()
+void process::compute_loop()
{
- if (lb_iter == 1) // warn only once
- XBT_WARN("process::load_balance() is a no-op!");
-}
+ using std::tr1::bind;
+ using std::tr1::placeholders::_1;
-void process::compute()
-{
- if (real_load > 0.0) {
+ double next_iter_after_date = 0.0;
+ while (still_running()) {
+ // receive
+ double sleep_duration = real_load
+ ? std::max(MSG_get_clock() - next_iter_after_date, 0.0)
+ : opt::min_comp_iter_duration;
+ data_receive(sleep_duration);
+
+ comm.data_flush(false);
+
+ if (real_load == 0.0)
+ continue;
+
+ // send
+ std::for_each(neigh.begin(), neigh.end(),
+ bind(&process::data_send, this, _1));
+
+ // 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);
MSG_task_execute(task);
comp += flops;
MSG_task_destroy(task);
- } else {
- XBT_DEBUG("nothing to compute !");
- }
-}
-void process::send(neighbor& nb, double amount)
-{
- set_load(get_load() - amount);
- nb.set_to_send(nb.get_to_send() + amount);
- nb.set_load(nb.get_load() + amount); // fixme: make this optional?
-}
-
-void process::send1_no_bookkeeping(neighbor& nb)
-{
- if (real_load != prev_load_broadcast)
- comm.ctrl_send(nb.get_ctrl_mbox(),
- new message(message::INFO, real_load));
- double load_to_send = nb.get_to_send();
- if (load_to_send > 0.0) {
- comm.data_send(nb.get_data_mbox(),
- new message(message::LOAD, load_to_send));
- nb.set_to_send(0.0);
+ next_iter_after_date = MSG_get_clock() + opt::min_comp_iter_duration;
}
-}
-void process::send1_bookkeeping(neighbor& nb)
-{
- if (expected_load != prev_load_broadcast)
- comm.ctrl_send(nb.get_ctrl_mbox(),
- new message(message::INFO, expected_load));
- double load_to_send;
- double new_debt;
- double debt_to_send = nb.get_to_send();
- if (debt_to_send > 0.0) {
- comm.ctrl_send(nb.get_ctrl_mbox(),
- new message(message::CREDIT, debt_to_send));
- nb.set_to_send(0.0);
- new_debt = nb.get_debt() + debt_to_send;
- } else {
- new_debt = nb.get_debt();
- }
- if (real_load <= new_debt) {
- load_to_send = real_load;
- nb.set_debt(new_debt - load_to_send);
- real_load = 0.0;
- } else {
- load_to_send = new_debt;
- nb.set_debt(0.0);
- real_load -= load_to_send;
+ XBT_VERB("Going to finalize for %s...", __func__);
+ XBT_DEBUG("send DATA_CLOSE to %zu neighbor%s",
+ neigh.size(), ESSE(neigh.size()));
+ std::for_each(neigh.begin(), neigh.end(),
+ 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);
}
- if (load_to_send > 0.0)
- comm.data_send(nb.get_data_mbox(),
- new message(message::LOAD, load_to_send));
+ comm.data_flush(true);
}
-void process::send_all()
+bool process::still_running()
{
- using std::tr1::bind;
- using std::tr1::placeholders::_1;
+ static bool last_status = true;
- if (opt::bookkeeping) {
- std::for_each(neigh.begin(), neigh.end(),
- bind(&process::send1_bookkeeping, this, _1));
- prev_load_broadcast = expected_load;
- } else {
- std::for_each(neigh.begin(), neigh.end(),
- bind(&process::send1_no_bookkeeping, this, _1));
- prev_load_broadcast = real_load;
- }
- comm.ctrl_flush(false);
- comm.data_flush(false);
-}
+ if (!last_status) {
+ /* nop */
-void process::receive(double timeout)
-{
- message* msg;
- m_host_t from;
+ } 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;
- XBT_DEBUG("%sblocking receive (%g)", "\0non-" + !timeout, timeout);
- while (may_receive() && (comm.ctrl_recv(msg, from, timeout) ||
- comm.data_recv(msg, from, timeout))) {
- switch (msg->get_type()) {
- case message::INFO: {
- neighbor* n = rev_neigh[from];
- n->set_load(msg->get_amount());
- break;
- }
- case message::CREDIT:
- expected_load += msg->get_amount();
- break;
- case message::LOAD: {
- double ld = msg->get_amount();
- real_load += ld;
- if (finalizing)
- total_load_running -= 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;
- timeout = 0.0; // only wait on first recv
+ } 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!
+ // fixme: should this chunk be moved before call to receive() ?
+ XBT_VERB("No more load to balance in system.");
+ last_status = false;
}
- comm.ctrl_flush(false);
- comm.data_flush(false);
+
+ return last_status;
}
-void process::finalize1(neighbor& nb)
+void process::load_balance()
{
- comm.ctrl_send(nb.get_ctrl_mbox(), new message(message::CTRL_CLOSE, 0.0));
- comm.data_send(nb.get_data_mbox(), new message(message::DATA_CLOSE, 0.0));
+ if (lb_iter == 1) // warn only once
+ XBT_WARN("process::load_balance() is a no-op!");
}
-void process::finalize()
+void process::send(neighbor& nb, double amount)
{
- using std::tr1::bind;
- using std::tr1::placeholders::_1;
-
- finalizing = true;
- total_load_running -= real_load;
-
- XBT_DEBUG("send CLOSE to %zu neighbor%s", neigh.size(), ESSE(neigh.size()));
- std::for_each(neigh.begin(), neigh.end(),
- bind(&process::finalize1, this, _1));
-
- while (may_receive()) {
- comm.ctrl_flush(false);
- comm.data_flush(false);
- XBT_DEBUG("waiting for %d CTRL and %d DATA CLOSE",
- ctrl_close_pending, data_close_pending);
- receive(-1.0);
- }
-
- comm.ctrl_flush(true);
- comm.data_flush(true);
+ set_load(get_load() - amount);
+ nb.set_to_send(nb.get_to_send() + amount);
+ nb.set_load(nb.get_load() + amount);
}
#define print_loads_generic(vec, verbose, logp, cat) \
#undef print_loads_generic
+void process::ctrl_send(neighbor& nb)
+{
+ double info_to_send = get_load();
+ if (info_to_send != prev_load_broadcast)
+ comm.ctrl_send(nb.get_ctrl_mbox(),
+ new message(message::INFO, info_to_send));
+ if (opt::bookkeeping) {
+ double 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);
+ comm.ctrl_send(nb.get_ctrl_mbox(),
+ new message(message::CREDIT, debt_to_send));
+ }
+ }
+}
+
+void process::data_send(neighbor& nb)
+{
+ double load_to_send;
+ if (opt::bookkeeping) {
+ if (real_load <= nb.get_debt()) {
+ load_to_send = real_load;
+ nb.set_debt(nb.get_debt() - load_to_send);
+ real_load = 0.0;
+ } else {
+ load_to_send = nb.get_debt();
+ nb.set_debt(0.0);
+ real_load -= load_to_send;
+ }
+ } else {
+ load_to_send = nb.get_to_send();
+ nb.set_to_send(0.0);
+ }
+ if (load_to_send > 0.0)
+ comm.data_send(nb.get_data_mbox(),
+ new message(message::LOAD, load_to_send));
+}
+
+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)) {
+ 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)) {
+ handle_message(msg, from);
+ timeout = 0.0;
+ }
+}
+
+void process::handle_message(message* msg, m_host_t from)
+{
+ switch (msg->get_type()) {
+ case message::INFO: {
+ neighbor* n = rev_neigh[from];
+ n->set_load(msg->get_amount());
+ break;
+ }
+ case message::CREDIT:
+ expected_load += msg->get_amount();
+ break;
+ case message::LOAD: {
+ double ld = msg->get_amount();
+ real_load += ld;
+ if (finalizing)
+ total_load_running -= 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;
+}
+
// Local variables:
// mode: c++
// End:
