#include <algorithm>
#include <tr1/functional>
#include <iterator>
+#include <numeric>
#include <stdexcept>
#include <sstream>
#include <xbt/log.h>
double process::total_load_running = 0.0;
double process::total_load_exit = 0.0;
+namespace {
+
+ void sleep_until_date(double& date, double duration = 0.0)
+ {
+ double sleep_duration = date - MSG_get_clock();
+ if (sleep_duration > 0.0)
+ MSG_process_sleep(sleep_duration);
+ date = MSG_get_clock() + duration;
+ }
+
+}
+
process::process(int argc, char* argv[])
{
if (argc < 2 || !(std::istringstream(argv[1]) >> real_load))
rev_neigh.insert(std::make_pair(host, ptr));
}
- comp = 0.0;
-
prev_load_broadcast = -1; // force sending of load on first send_all()
expected_load = real_load;
total_load_running += real_load;
comp_iter = lb_iter = 0;
+ lb_thread = new_msg_thread("loba",
+ std::tr1::bind(&process::load_balance_loop,
+ this));
+
e_xbt_log_priority_t logp = xbt_log_priority_verbose;
if (!LOG_ISENABLED(logp))
return;
process::~process()
{
+ delete lb_thread;
total_load_exit += real_load;
- if (opt::bookkeeping) {
- XBT_INFO("Final load after %d:%d iterations: %g ; expected: %g",
- lb_iter, comp_iter, real_load, expected_load);
- } else {
- XBT_INFO("Final load after %d iterations: %g",
- lb_iter, real_load);
- if (lb_iter != comp_iter)
- XBT_WARN("lb_iter (%d) and comp_iter (%d) differ!",
- lb_iter, comp_iter);
- }
- XBT_VERB("Total computation for this process: %g", comp);
+ if (opt::log_rate < 0)
+ return;
+ XBT_INFO("Final load after %d:%d iterations: %g",
+ lb_iter, comp_iter, real_load);
+ XBT_VERB("Expected load was: %g", expected_load);
+ XBT_VERB("Total computation for this process: %g", get_comp_amount());
}
int process::run()
{
- double next_iter_after_date = 0.0;
- XBT_INFO("Initial load: %g", real_load);
+ if (opt::log_rate >= 0) {
+ XBT_INFO("Initial load: %g", real_load);
+ XBT_VERB("Initial expected load: %g", expected_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_iter_duration;
+ mutex.acquire();
+ lb_thread->start();
+ while (lb_iter <= opt::comp_iter_delay)
+ cond.wait(mutex);
+ mutex.release();
+ double sleep_duration = opt::comp_time_delay - MSG_get_clock();
+ if (sleep_duration > 0.0)
+ MSG_process_sleep(sleep_duration);
+ compute_loop();
+ lb_thread->wait();
+ XBT_VERB("Done.");
+ return 0;
+}
+
+void process::load_balance_loop()
+{
+ using std::tr1::bind;
+ using std::tr1::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;
+ }
- 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);
- }
+ 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);
- }
+ print_loads(true, xbt_log_priority_debug);
- // send load information, and load (data) if any
- send_all();
- if (real_load > 0.0) {
- ++comp_iter;
- compute();
- }
+ // send
+ std::for_each(neigh.begin(), neigh.end(),
+ bind(&process::ctrl_send, this, _1));
+ prev_load_broadcast = expected_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;
- }
+ sleep_until_date(next_iter_after_date, opt::min_lb_iter_duration);
+ ctrl_receive(0.0);
+
+ comm.ctrl_flush(false);
+ }
+
+ 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::compute_loop()
+{
+ using std::tr1::bind;
+ using std::tr1::placeholders::_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_iter_duration)
- timeout = opt::min_iter_duration;
+ double next_iter_after_date = MSG_get_clock() + opt::min_comp_iter_duration;
+ while (still_running()) {
+ // receive
+ if (real_load > 0.0)
+ data_receive(0.0);
else
- timeout = 1.0;
- receive(timeout);
+ data_receive(opt::min_comp_iter_duration);
- // one of our neighbor is finalizing
- if (opt::exit_on_close && close_received) {
- XBT_VERB("Close received");
- break;
- }
+ comm.data_flush(false);
- // 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;
- }
+ 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);
+ 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__);
+ // last send, for not losing load scheduled to be sent
+ std::for_each(neigh.begin(), neigh.end(),
+ bind(&process::data_send, this, _1));
+ finalizing = true;
+ total_load_running -= real_load;
+ 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);
+ }
+ 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!
- // 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);
- }
+ XBT_VERB("No more load to balance in system.");
+ last_status = false;
}
- XBT_VERB("Going to finalize...");
- finalize();
- /* Open Questions :
- * - definition of load on heterogeneous hosts ?
- * - how to detect convergence ?
- * - how to manage link failures ?
- */
+ return last_status;
+}
- XBT_VERB("Done.");
- return 0;
+double process::get_sum_of_to_send() const
+{
+ using std::tr1::bind;
+ using std::tr1::placeholders::_1;
+ using std::tr1::placeholders::_2;
+
+ return std::accumulate(neigh.begin(), neigh.end(), 0.0,
+ bind(std::plus<double>(),
+ _1, bind(&neighbor::get_to_send, _2)));
}
void process::load_balance()
XBT_WARN("process::load_balance() is a no-op!");
}
-void process::compute()
-{
- if (real_load > 0.0) {
- 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);
- comp += flops;
- MSG_task_destroy(task);
- } else {
- XBT_DEBUG("nothing to compute !");
- }
-}
-
void process::send(neighbor& nb, double amount)
{
- set_load(get_load() - amount);
+ expected_load -= amount;
nb.set_to_send(nb.get_to_send() + amount);
- nb.set_load(nb.get_load() + amount); // fixme: make this optional?
+ nb.set_load(nb.get_load() + amount);
}
-void process::send1_no_bookkeeping(neighbor& nb)
+void process::ctrl_send(neighbor& nb)
{
- if (real_load != prev_load_broadcast)
- comm.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.send(nb.get_data_mbox(), new message(message::LOAD, load_to_send));
- nb.set_to_send(0.0);
+ double info_to_send = expected_load;
+ if (info_to_send != prev_load_broadcast) {
+ message* msg = new message(message::INFO, info_to_send);
+ add_ctrl_send_mesg(msg->get_size());
+ comm.ctrl_send(nb.get_ctrl_mbox(), msg);
+ }
+ 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);
+ message* msg = new message(message::CREDIT, debt_to_send);
+ add_ctrl_send_mesg(msg->get_size());
+ comm.ctrl_send(nb.get_ctrl_mbox(), msg);
+ }
}
}
-void process::send1_bookkeeping(neighbor& nb)
+void process::data_send(neighbor& nb)
{
- if (expected_load != prev_load_broadcast)
- comm.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.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;
+ if (opt::bookkeeping) {
+ load_to_send = std::min(real_load, nb.get_debt());
+ if (load_to_send >= opt::min_transfer_amount) {
+ nb.set_debt(nb.get_debt() - load_to_send);
+ real_load -= load_to_send;
+ } else {
+ load_to_send = 0.0;
+ }
} else {
- new_debt = nb.get_debt();
+ load_to_send = nb.get_to_send();
+ if (load_to_send >= opt::min_transfer_amount) {
+ nb.set_to_send(0.0);
+ real_load -= load_to_send;
+ } else {
+ load_to_send = 0.0;
+ }
}
- 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;
+ 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::LOAD, amount);
+ add_data_send_mesg(msg->get_size());
+ comm.data_send(nb.get_data_mbox(), msg);
+ load_to_send -= amount;
}
- if (load_to_send > 0.0)
- comm.send(nb.get_data_mbox(), new message(message::LOAD, load_to_send));
}
-void process::send_all()
+void process::ctrl_close(neighbor& nb)
{
- using std::tr1::bind;
- using std::tr1::placeholders::_1;
+ comm.ctrl_send(nb.get_ctrl_mbox(), new message(message::CTRL_CLOSE, 0.0));
+}
- 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.flush(false);
+void process::data_close(neighbor& nb)
+{
+ comm.data_send(nb.get_data_mbox(), new message(message::DATA_CLOSE, 0.0));
}
-void process::receive(double timeout)
+void process::ctrl_receive(double timeout)
{
message* msg;
m_host_t from;
- XBT_DEBUG("%sblocking receive (%g)", "\0non-" + !timeout, timeout);
- while (may_receive() && comm.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
+ 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;
}
- comm.flush(false);
}
-void process::finalize1(neighbor& nb)
+void process::data_receive(double timeout)
{
- comm.send(nb.get_ctrl_mbox(), new message(message::CTRL_CLOSE, 0.0));
- comm.send(nb.get_data_mbox(), new message(message::DATA_CLOSE, 0.0));
+ 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::finalize()
+void process::handle_message(message* msg, m_host_t from)
{
- using std::tr1::bind;
- using std::tr1::placeholders::_1;
-
- finalizing = true;
- total_load_running -= real_load;
-
- XBT_DEBUG("send CLOSE to %lu neighbor%s",
- (unsigned long )neigh.size(), ESSE(neigh.size()));
- std::for_each(neigh.begin(), neigh.end(),
- bind(&process::finalize1, this, _1));
-
- while (may_receive()) {
- comm.flush(false);
- XBT_DEBUG("waiting for %d CTRL and %d DATA CLOSE",
- ctrl_close_pending, data_close_pending);
- receive(-1.0);
+ switch (msg->get_type()) {
+ case message::INFO: {
+ neighbor* n = rev_neigh[from];
+ n->set_load(msg->get_amount() + n->get_to_send());
+ break;
}
-
- comm.flush(true);
+ 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;
}
#define print_loads_generic(vec, verbose, logp, cat) \
if (_XBT_LOG_ISENABLEDV((*cat), logp)) { \
using std::tr1::bind; \
using std::tr1::placeholders::_1; \
- XBT_XCLOG(cat, logp, "Neighbor loads:"); \
+ XBT_XCLOG(cat, logp, "My load: %g (real); %g (expected). " \
+ "Neighbor loads:", real_load, expected_load); \
std::for_each(vec.begin(), vec.end(), \
bind(&neighbor::print, _1, verbose, logp, cat)); \
} else ((void)0)
