X-Git-Url: https://bilbo.iut-bm.univ-fcomte.fr/and/gitweb/loba.git/blobdiff_plain/6ad1e94466f69183cec5ce63db62c248e00e5db6..9539c77f2b5e0eef8d06da7a7ddd1d5546ba0731:/process.cpp?ds=sidebyside diff --git a/process.cpp b/process.cpp index db84ff8..b6a6d28 100644 --- a/process.cpp +++ b/process.cpp @@ -20,6 +20,10 @@ 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; + namespace { void sleep_until_date(double& date, double duration) @@ -54,17 +58,27 @@ process::process(int argc, char* argv[]) 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; + 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; - comp_iter = lb_iter = 0; + all_comp_iter = comp_iter = lb_iter = 0; lb_thread = new_msg_thread("loba", std::bind(&process::load_balance_loop, this)); @@ -93,8 +107,14 @@ process::~process() "received_load is %g, but should be 0.0 !", received_load); if (opt::log_rate < 0) return; - XBT_INFO("Final load after %d:%d iterations: %g", - lb_iter, comp_iter, real_load); + 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); @@ -144,7 +164,8 @@ void process::load_balance_loop() // 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_INFO("(%u:%u:%u) current load: %g", + lb_iter, comp_iter, all_comp_iter, real_load); XBT_VERB("... expected load: %g", expected_load); } @@ -182,20 +203,27 @@ void process::compute_loop() double next_iter_after_date = MSG_get_clock() + opt::min_comp_iter_duration; while (still_running()) { - // receive (do not block if there is something to compute) - data_receive(real_load > 0.0 ? 0.0 : opt::min_comp_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(); + 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(); - if (real_load == 0.0) - continue; + ++all_comp_iter; + + } while (real_load == 0.0); + + convergence_check(); // compute ++comp_iter; @@ -224,9 +252,30 @@ void process::compute_loop() 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 { + 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; @@ -323,13 +372,18 @@ void process::data_send(neighbor& nb) { double load_to_send; if (opt::bookkeeping) { // bookkeeping - double excess_load; + 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; - load_to_send = compute_load_to_send(std::min(excess_load, - nb.get_debt())); + + 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 @@ -395,12 +449,18 @@ void process::handle_message(message* msg, m_host_t from) case message::CTRL: { neighbor* n = rev_neigh[from]; n->set_load(msg->get_amount() + n->get_to_send()); - expected_load += msg->get_credit(); // may be 0.0 if !opt::bookkeeping + 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: