X-Git-Url: https://bilbo.iut-bm.univ-fcomte.fr/and/gitweb/loba.git/blobdiff_plain/c769579a8be568370d2657059486574371e914c2..4070ccac91e53f3e724eb56602addf609ffee081:/process.cpp?ds=inline diff --git a/process.cpp b/process.cpp index 8a73f38..48dac1d 100644 --- a/process.cpp +++ b/process.cpp @@ -1,4 +1,5 @@ #include +#include #include #include #include @@ -19,6 +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) @@ -36,6 +41,13 @@ process::process(int argc, char* argv[]) 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()); @@ -46,16 +58,28 @@ 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; + + 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; - 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)); @@ -80,12 +104,36 @@ process::~process() { 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 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); +} + +double process::get_iter_deviation() const +{ + double average_cost = opt::comp_cost(total_load_average); + // Do not count idle periods + double comp_iter_opt = acc.comp_amount / average_cost; +/* + // Add iterations that could have been achieved while beeing idle + // (kept for documentation) + double self_speed = MSG_get_host_speed(MSG_host_self()); + double average_duration = average_cost / self_speed; + comp_iter_opt += idle_duration / average_duration; +*/ + return comp_iter - comp_iter_opt; } int process::run() @@ -124,13 +172,16 @@ void process::load_balance_loop() ++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) 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); } @@ -147,7 +198,6 @@ void process::load_balance_loop() mutex.release(); sleep_until_date(next_iter_after_date, opt::min_lb_iter_duration); - ctrl_receive(0.0); } XBT_VERB("Going to finalize for %s...", __func__); @@ -168,26 +218,32 @@ void process::compute_loop() 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()) { - // receive - mutex.acquire(); - if (real_load > 0.0) - data_receive(0.0); - else - data_receive(opt::min_comp_iter_duration); - mutex.release(); - // send - comm.data_flush(false); - mutex.acquire(); - 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); - if (real_load == 0.0) - continue; + // 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); @@ -197,12 +253,14 @@ void process::compute_loop() 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__); + // Note: idle duration is not counted during finalization 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(), @@ -212,9 +270,33 @@ void process::compute_loop() 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 { + 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; @@ -300,26 +382,37 @@ void process::ctrl_send(neighbor& nb) } } +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) { - load_to_send = std::min(real_load, nb.get_debt()); - if (load_to_send >= opt::min_transfer_amount) { + 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); - real_load -= load_to_send; - } else { - load_to_send = 0.0; - } - } else { - 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; - } + } 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) @@ -377,14 +470,18 @@ 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(); - real_load += ld; - if (finalizing) - total_load_running -= ld; + received_load += ld; + n->set_credit(n->get_credit() - ld); break; } case message::CTRL_CLOSE: