X-Git-Url: https://bilbo.iut-bm.univ-fcomte.fr/and/gitweb/loba.git/blobdiff_plain/d47d44b2ed067c834ef210ad544512e7581a1c8e..01f10aeb9d9a94f01006b4e7396711b8964f43da:/process.cpp?ds=sidebyside diff --git a/process.cpp b/process.cpp index 7605818..eac87d1 100644 --- a/process.cpp +++ b/process.cpp @@ -1,90 +1,510 @@ #include +#include #include #include +#include #include #include #include +#include + +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; + +int process::process_counter = 0; +double process::total_load_average; +double process::load_diff_threshold; -struct message { - double measure; - double transfer; -}; +namespace { + + void sleep_until_date(double& date, double duration) + { + 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[]) +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"); + + double iload = std::trunc(real_load); + if (opt::integer_transfer && real_load != iload) { + XBT_WARN("Initial load %g is not an integer. Truncate it.", + real_load); + real_load = iload; + } + 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)); + } + + // Note: there should not be race condition with the current + // version of Simgrid, when updating the global variables. + + 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; + received_load = 0.0; + + idle_duration = 0.0; + convergence = -1.0; + + process_counter++; + total_load_average = total_load_running / process_counter; + load_diff_threshold = (opt::load_ratio_threshold + + opt::avg_load_ratio * total_load_average) / 100.0; + + ctrl_close_pending = data_close_pending = neigh.size(); + close_received = false; + finalizing = false; + + all_comp_iter = comp_iter = lb_iter = 0; + + lb_thread = new_msg_thread("loba", + std::bind(&process::load_balance_loop, this)); + 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(oss, ", "), - std::mem_fun_ref(&neighbor::getName)); - oss << neigh.back().getName(); + std::ostream_iterator(oss, ", "), + std::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); } -int process::run() +process::~process() { - 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; - * } - */ - - /* Open Questions : - * - definition of load on heterogeneous hosts ? - * - how to detect convergence ? - * - how to manage link failures ? - */ - - // xxx: shall we retrieve pending tasks? + delete lb_thread; + total_load_exit += real_load; + xbt_assert(received_load == 0.0, + "received_load is %g, but should be 0.0 !", received_load); + if (opt::log_rate < 0) + return; + XBT_INFO("Final load after %d:%d:%d iterations: %g", + lb_iter, comp_iter, all_comp_iter, real_load); + if (convergence >= 0.0) + XBT_INFO("Convergence within %g%% was achieved at time %g", + opt::avg_load_ratio, convergence); + else + XBT_INFO("Convergence within %g%% was not achieved", + opt::avg_load_ratio); + XBT_VERB("Expected load was: %g", expected_load); + XBT_VERB("Total computation for this process: %g", get_comp_amount()); + print_loads(true, xbt_log_priority_debug); +} +int process::run() +{ + if (opt::log_rate >= 0) { + XBT_INFO("Initial load: %g", real_load); + XBT_VERB("Initial expected load: %g", expected_load); + } + XBT_VERB("Starting..."); + 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::compute() +void process::load_balance_loop() { - double duration = opt::comp_cost(load); - m_task_t task = MSG_task_create("computation", duration, 0.0, NULL); - MSG_task_execute(task); - MSG_task_destroy(task); + 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:%u) current load: %g", + lb_iter, comp_iter, all_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::print_loads(e_xbt_log_priority_t logp) +void process::compute_loop() { - if (!LOG_ISENABLED(logp)) - return; - std::ostringstream oss; - if (neigh.empty()) { - oss << "no neighbor!"; + using std::placeholders::_1; + + double next_iter_after_date = MSG_get_clock() + opt::min_comp_iter_duration; + double idle_since_date = 0.0; + while (still_running()) { + + do { + // receive + // if there is something to compute, do not block + // else, block the duration of an *lb* iteration + data_receive(real_load > 0.0 ? 0.0 : opt::min_lb_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(); + + ++all_comp_iter; + + } while (real_load == 0.0); + + convergence_check(); + + // compute + idle_duration += MSG_get_clock() - idle_since_date; + ++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); + + idle_since_date = MSG_get_clock(); + + 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; + convergence_check(); + comm.data_flush(true); +} + +void process::convergence_check() +{ + double load_diff = std::fabs(real_load - total_load_average); + bool converged = load_diff <= load_diff_threshold; + + if (convergence >= 0.0) { + if (!converged) { + XBT_VERB("current load has diverged: %g (%.4g%%)", + real_load, 100.0 * load_diff / total_load_average); + convergence = -1.0; + } } else { - std::transform(neigh.begin(), neigh.end() - 1, - std::ostream_iterator(oss, ", "), - std::mem_fun_ref(&neighbor::getLoad)); - oss << neigh.back().getLoad(); + if (converged) { + XBT_VERB("current load has converged: %g (%.4g%%)", + real_load, 100.0 * load_diff / total_load_average); + convergence = MSG_get_clock(); + } + } +} + +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(), _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; } - LOG1(logp, "Neighbor loads: %s", oss.str().c_str()); + 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 + // Local variables: // mode: c++ // End: