#include <sstream>
#include <xbt/log.h>
#include <xbt/time.h>
+
+XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(proc);
+
#include "misc.h"
#include "options.h"
+#include "tracing.h"
+
#include "process.h"
-XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(simu);
+double process::total_load_init = 0.0;
+double process::total_load_running = 0.0;
+double process::total_load_exit = 0.0;
process::process(int argc, char* argv[])
{
- if (argc < 2 || !(std::istringstream(argv[1]) >> load))
- throw std::invalid_argument("bad or missing initial load");
+ if (argc < 2 || !(std::istringstream(argv[1]) >> real_load))
+ throw std::invalid_argument("bad or missing initial load parameter");
neigh.assign(argv + 2, argv + argc);
- expected_load = load;
- ctrl_close_pending = data_close_pending = neigh.size();
- if (neigh.size() == 1) {
- comm.next_close_on_ctrl_is_last();
- comm.next_close_on_data_is_last();
+ pneigh.reserve(neigh.size());
+ for (unsigned i = 0 ; i < neigh.size() ; i++) {
+ neighbor* ptr = &neigh[i];
+ m_host_t host = MSG_get_host_by_name(ptr->get_name());
+ pneigh.push_back(ptr);
+ rev_neigh.insert(std::make_pair(host, ptr));
}
- if (neigh.size() > 0)
- comm.listen();
+
+ comp = 0.0;
+
+ prev_load_broadcast = -1; // force sending of load on first send_all()
+ expected_load = real_load;
+ total_load_running += real_load;
+ total_load_init += real_load;
+
+ ctrl_close_pending = data_close_pending = neigh.size();
+ close_received = false;
+ finalizing = false;
+
+ comp_iter = lb_iter = 0;
e_xbt_log_priority_t logp = xbt_log_priority_verbose;
if (!LOG_ISENABLED(logp))
return;
- LOG1(logp, "My initial load is: %g", load);
std::ostringstream oss;
oss << neigh.size() << " neighbor";
if (!neigh.empty()) {
std::tr1::mem_fn(&neighbor::get_name));
oss << neigh.back().get_name();
}
- LOG1(logp, "Got %s.", oss.str().c_str());
- print_loads(logp);
+ XBT_LOG(logp, "Got %s.", oss.str().c_str());
+ print_loads(false, logp);
+}
+
+process::~process()
+{
+ 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);
}
int process::run()
{
- bool one_more = true;
- unsigned iter = 0;
- VERB0("Starting...");
- while (one_more) {
- bool close_received;
-
- if (opt::bookkeeping)
- INFO3("(%u) current load: %g ; expected: %g",
- iter, load, expected_load);
- else
- INFO2("(%u) current load: %g",
- iter, load);
+ 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;
- compute();
- close_received = !receive(false);
+ ++lb_iter;
- /*
- * compute load balancing;
- * send tasks to neighbors;
- */
+ 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);
+ }
- comm.flush(false);
- ++iter;
+ load_balance();
- if (opt::exit_on_close && close_received)
- one_more = false;
- if (opt::maxiter && iter >= opt::maxiter)
- one_more = false;
+ 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();
+ }
+
+ 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;
+ }
+
+ // 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;
+ }
+
+ // 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);
+ }
}
- VERB0("Going to finalize...");
+ XBT_VERB("Going to finalize...");
finalize();
/* Open Questions :
* - how to manage link failures ?
*/
- VERB0("Done.");
+ XBT_VERB("Done.");
return 0;
}
+void process::load_balance()
+{
+ if (lb_iter == 1) // warn only once
+ XBT_WARN("process::load_balance() is a no-op!");
+}
+
void process::compute()
{
- // fixme: shall we do something special when duration is 0 ?
- double duration = opt::comp_cost(load);
- m_task_t task = MSG_task_create("computation", duration, 0.0, NULL);
- DEBUG2("compute %g flop%s.", duration, ESSE(duration));
- MSG_task_execute(task);
- MSG_task_destroy(task);
+ 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);
+ 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.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);
+ }
+}
-// Returns false if a CLOSE message was received.
-bool process::receive(bool wait_for_close)
+void process::send1_bookkeeping(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;
+ } 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;
+ }
+ if (load_to_send > 0.0)
+ comm.send(nb.get_data_mbox(), new message(message::LOAD, load_to_send));
+}
+
+void process::send_all()
+{
+ using std::tr1::bind;
+ using std::tr1::placeholders::_1;
+
+ 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::receive(double timeout)
{
- bool result = true;
message* msg;
m_host_t from;
- while ((ctrl_close_pending ||
- data_close_pending) && comm.recv(msg, from, wait_for_close)) {
- DEBUG2("received %s from %s",
- msg->to_string().c_str(), MSG_host_get_name(from));
+
+ XBT_DEBUG("%sblocking receive (%g)", "\0non-" + !timeout, timeout);
+ while (may_receive() && comm.recv(msg, from, timeout)) {
switch (msg->get_type()) {
- case message::INFO:
- // fixme: update neighbor
- // need a map m_host_t -> neighbor&
+ 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:
- load += msg->get_amount();
+ case message::LOAD: {
+ double ld = msg->get_amount();
+ real_load += ld;
+ if (finalizing)
+ total_load_running -= ld;
break;
+ }
case message::CTRL_CLOSE:
- if (--ctrl_close_pending == 1)
- comm.next_close_on_ctrl_is_last();
- DEBUG1("ctrl_close_pending = %d", ctrl_close_pending);
- result = false;
+ ctrl_close_pending--;
+ close_received = true;
break;
case message::DATA_CLOSE:
- if (--data_close_pending == 1)
- comm.next_close_on_data_is_last();
- DEBUG1("data_close_pending = %d", data_close_pending);
- result = false;
+ data_close_pending--;
+ close_received = true;
break;
}
delete msg;
+ timeout = 0.0; // only wait on first recv
}
- return result;
+ comm.flush(false);
+}
+
+void process::finalize1(neighbor& nb)
+{
+ 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));
}
void process::finalize()
{
- DEBUG2("send CLOSE to %d neighbor%s.",
- (int )neigh.size(), ESSE(neigh.size()));
- std::vector<neighbor>::iterator n;
- for (n = neigh.begin() ; n != neigh.end() ; ++n) {
- comm.send(n->get_ctrl_mbox(), new message(message::CTRL_CLOSE, 0.0));
- comm.send(n->get_data_mbox(), new message(message::DATA_CLOSE, 0.0));
- }
+ 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));
- DEBUG2("wait for CLOSE from %d neighbor%s.",
- (int )neigh.size(), ESSE(neigh.size()));
- receive(true);
+ 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);
+ }
comm.flush(true);
}
-void process::print_loads(e_xbt_log_priority_t logp)
+#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:"); \
+ std::for_each(vec.begin(), vec.end(), \
+ 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
{
- if (!LOG_ISENABLED(logp))
- return;
+ print_loads_generic(neigh, verbose, logp, cat);
+}
- std::ostringstream oss;
- if (neigh.empty()) {
- oss << "no neighbor!";
- } else {
- std::transform(neigh.begin(), neigh.end() - 1,
- std::ostream_iterator<double>(oss, ", "),
- std::tr1::mem_fn(&neighbor::get_load));
- oss << neigh.back().get_load();
- }
- LOG1(logp, "Neighbor loads: %s", oss.str().c_str());
+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
+
// Local variables:
// mode: c++
// End:
