#include <algorithm>
-#include <functional>
+#include <tr1/functional>
#include <iterator>
+#include <numeric>
#include <stdexcept>
#include <sstream>
#include <xbt/log.h>
+#include <xbt/time.h>
+
+XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(proc);
+
#include "misc.h"
-#include "process.h"
+#include "options.h"
+#include "tracing.h"
-XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(simu);
+#include "process.h"
-struct message {
- double measure;
- double transfer;
-};
+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[])
+process::process(int argc, char* argv[])
{
if (argc < 2 || !(std::istringstream(argv[1]) >> load))
- throw std::invalid_argument("bad or missing initial load");
+ throw std::invalid_argument("bad or missing initial load parameter");
+
neigh.assign(argv + 2, argv + argc);
+
+ 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));
+ }
+
+ comp = 0.0;
+
+ prev_load_broadcast = -1; // force sending of load on first send()
+ expected_load = load;
+ total_load_running += load;
+ total_load_init += load;
+
+ ctrl_close_pending = data_close_pending = neigh.size();
+ close_received = false;
+ finalizing = false;
+
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()) {
- oss << (neigh.size() > 1 ? "s: " : ": ");
+ oss << ESSE(neigh.size()) << ": ";
std::transform(neigh.begin(), neigh.end() - 1,
- std::ostream_iterator<std::string>(oss, ", "),
- std::mem_fun_ref(&neighbor::getName));
- oss << neigh.back().getName();
+ std::ostream_iterator<const char*>(oss, ", "),
+ std::tr1::mem_fn(&neighbor::get_name));
+ oss << neigh.back().get_name();
}
LOG1(logp, "Got %s.", oss.str().c_str());
- print_loads(logp);
+ print_loads(false, logp);
}
-void process::print_loads(e_xbt_log_priority_t logp)
+process::~process()
{
- if (!LOG_ISENABLED(logp))
- return;
- std::ostringstream oss;
- if (neigh.empty()) {
- oss << "no neighbor!";
+ total_load_exit += load;
+ if (opt::bookkeeping) {
+ INFO4("Final load after %d:%d iterations: %g ; expected: %g",
+ lb_iter, comp_iter, load, expected_load);
} else {
- std::transform(neigh.begin(), neigh.end() - 1,
- std::ostream_iterator<double>(oss, ", "),
- std::mem_fun_ref(&neighbor::getLoad));
- oss << neigh.back().getLoad();
+ INFO2("Final load after %d iterations: %g",
+ lb_iter, load);
+ if (lb_iter != comp_iter)
+ WARN2("lb_iter (%d) and comp_iter (%d) differ!",
+ lb_iter, comp_iter);
}
- LOG1(logp, "Neighbor loads: %s", oss.str().c_str());
+ VERB1("Total computation for this process: %g", comp);
}
int process::run()
{
- INFO0("Coucou !");
- MSG_process_sleep(100.0); // xxx
- /* xxx:
- * while (there is something to do) {
- * compute some task;
- * get received tasks;
- * compute load balancing;
- * send tasks to neighbors;
- * }
- */
+ double next_iter_after_date = 0.0;
+ INFO1("Initial load: %g", load);
+ VERB0("Starting...");
+ comp_iter = lb_iter = 0;
+ while (true) {
+ double ld = lb_load();
+ if (ld > 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;
+
+ ++lb_iter;
+
+ if (opt::log_rate && lb_iter % opt::log_rate == 0) {
+ if (opt::bookkeeping)
+ INFO4("(%u:%u) current load: %g ; expected: %g",
+ lb_iter, comp_iter, load, expected_load);
+ else
+ INFO2("(%u) current load: %g",
+ lb_iter, load);
+ }
+
+ ld -= load_balance(ld);
+
+ print_loads(true, xbt_log_priority_debug);
+ }
+ lb_load() = ld;
+
+ // send load information, and load (data) if any
+ send();
+ if (load > 0.0) {
+ ++comp_iter;
+ compute();
+ }
+
+ if (opt::lb_maxiter && lb_iter >= opt::lb_maxiter) {
+ VERB2("Reached lb_maxiter: %d/%d", lb_iter, opt::lb_maxiter);
+ break;
+ }
+ if (opt::comp_maxiter && comp_iter >= opt::comp_maxiter) {
+ VERB2("Reached comp_maxiter: %d/%d", comp_iter, opt::comp_maxiter);
+ break;
+ }
+ if (opt::time_limit && MSG_get_clock() >= opt::time_limit) {
+ VERB2("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 (load != 0 || lb_load() != prev_load_broadcast)
+ timeout = 0.0;
+ else if (opt::min_iter_duration)
+ timeout = opt::min_iter_duration;
+ else
+ timeout = 1.0;
+ receive(timeout);
+
+ // one of our neighbor is finalizing
+ if (opt::exit_on_close && close_received) {
+ VERB0("Close received");
+ break;
+ }
+
+ // have no load and cannot receive anything
+ if (load == 0.0 && !may_receive()) {
+ VERB0("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) {
+ VERB0("No more load to balance in system.");
+ break;
+ } else {
+ DEBUG1("still %g load to balance, continuing...", total_load_running);
+ }
+ }
+ VERB0("Going to finalize...");
+ finalize();
/* Open Questions :
* - definition of load on heterogeneous hosts ?
* - how to manage link failures ?
*/
- // xxx: shall we retrieve pending tasks?
-
+ VERB0("Done.");
return 0;
}
+double process::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)));
+}
+
+double process::load_balance(double /*my_load*/)
+{
+ if (lb_iter == 1) // warn only once
+ WARN0("process::load_balance() is a no-op!");
+ return 0.0;
+}
+
+void process::compute()
+{
+ if (load > 0.0) {
+ double flops = opt::comp_cost(load);
+ m_task_t task = MSG_task_create("computation", flops, 0.0, NULL);
+ TRACE_msg_set_task_category(task, TRACE_CAT_COMP);
+ DEBUG2("compute %g flop%s", flops, ESSE(flops));
+ MSG_task_execute(task);
+ comp += flops;
+ MSG_task_destroy(task);
+ } else {
+ DEBUG0("nothing to compute !");
+ }
+}
+
+void process::send1_no_bookkeeping(neighbor& nb)
+{
+ if (load != prev_load_broadcast)
+ comm.send(nb.get_ctrl_mbox(), new message(message::INFO, 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);
+ }
+}
+
+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 (load <= new_debt) {
+ load_to_send = load;
+ nb.set_debt(new_debt - load_to_send);
+ load = 0.0;
+ } else {
+ load_to_send = new_debt;
+ nb.set_debt(0.0);
+ 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()
+{
+ 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 = load;
+ }
+ comm.flush(false);
+}
+
+void process::receive(double timeout)
+{
+ message* msg;
+ m_host_t from;
+
+ DEBUG2("%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();
+ 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
+ }
+ 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()
+{
+ using std::tr1::bind;
+ using std::tr1::placeholders::_1;
+
+ finalizing = true;
+ total_load_running -= load;
+
+ DEBUG2("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));
+
+ DEBUG2("wait for CLOSE from %lu neighbor%s",
+ (unsigned long )neigh.size(), ESSE(neigh.size()));
+ while (may_receive()) {
+ comm.flush(false);
+ receive(-1.0);
+ }
+
+ comm.flush(true);
+}
+
+#define print_loads_generic(vec, verbose, logp, cat) \
+ if (_XBT_LOG_ISENABLEDV((*cat), logp)) { \
+ using std::tr1::bind; \
+ using std::tr1::placeholders::_1; \
+ XCLOG0(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
+{
+ 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
+
// Local variables:
// mode: c++
// End:
