#include <algorithm>
+#include <cmath>
#include <functional>
#include <iterator>
#include <numeric>
#include "process.h"
+mutex_t *process::proc_mutex;
+
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::average_load_ratio;
+double process::load_diff_threshold;
+
+std::atomic<int> process::convergence_counter(0);
+
namespace {
void sleep_until_date(double& date, double duration)
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());
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;
+
+ proc_mutex->acquire();
+ process_counter++;
+ convergence_counter++;
+ total_load_init += real_load;
+ total_load_running += real_load;
+ total_load_average = total_load_running / process_counter;
+ if (opt::avg_load_ratio >= 0.0)
+ average_load_ratio = opt::avg_load_ratio;
+ else
+ average_load_ratio = 100.0 *
+ (process_counter / -opt::avg_load_ratio) / total_load_average;
+ load_diff_threshold = (opt::load_ratio_threshold +
+ average_load_ratio * total_load_average) / 100.0;
+ proc_mutex->release();
+
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));
process::~process()
{
delete lb_thread;
+ proc_mutex->acquire();
total_load_exit += real_load;
+ proc_mutex->release();
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",
+ average_load_ratio, convergence);
+ else
+ XBT_INFO("Convergence within %g%% was not achieved",
+ average_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); // fixme: get locked?
+ // 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()
++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);
}
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__);
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 (do not block if there is something to compute)
- data_receive(real_load > 0.0 ? 0.0 : opt::min_comp_iter_duration);
+ // 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);
std::bind(&process::data_send, this, _1));
mutex.release();
+ ++all_comp_iter;
if (real_load == 0.0)
continue;
+ 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);
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;
XBT_DEBUG("send DATA_CLOSE to %zu neighbor%s",
neigh.size(), ESSE(neigh.size()));
}
real_load += received_load;
received_load = 0.0;
+ proc_mutex->acquire();
total_load_running -= real_load;
+ proc_mutex->release();
+ convergence_check();
comm.data_flush(true);
}
+void process::convergence_check()
+{
+ double average = total_load_average; // fixme: get locked?
+ double load_diff = std::fabs(real_load - average);
+ bool converged = load_diff <= load_diff_threshold;
+
+ if (converged) {
+ if (convergence < 0) {
+ XBT_VERB("current load has converged: %g (%.4g%%)",
+ real_load, 100.0 * load_diff / average);
+ convergence = MSG_get_clock();
+ local_convergence_counter = opt::exit_on_convergence;
+ }
+ if (local_convergence_counter > 0 && --local_convergence_counter == 0)
+ --convergence_counter;
+ } else {
+ if (convergence >= 0.0) {
+ XBT_VERB("current load has diverged: %g (%.4g%%)",
+ real_load, 100.0 * load_diff / average);
+ convergence = -1.0;
+ if (local_convergence_counter == 0)
+ ++convergence_counter;
+ }
+ }
+}
+
bool process::still_running()
{
static bool last_status = true;
XBT_VERB("Reached comp_maxiter: %d/%d", comp_iter, opt::comp_maxiter);
last_status = false;
+ } else if (opt::exit_on_convergence && convergence_counter == 0) {
+ XBT_VERB("Global convergence detected");
+ last_status = false;
+
} else if (opt::exit_on_close && close_received) {
XBT_VERB("Close received");
last_status = false;
last_status = false;
} else if (100.0 * total_load_running / total_load_init <=
- opt::load_ratio_threshold) {
+ opt::load_ratio_threshold) { // fixme: get locked?
// 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.");
}
}
+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)
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:
