X-Git-Url: https://bilbo.iut-bm.univ-fcomte.fr/and/gitweb/loba.git/blobdiff_plain/80a1fe1a200a4309c36598571b1f4ccb76a8788f..4d5ec9803b74d0f3e9c002a92a748bd08b6640ac:/process.cpp

diff --git a/process.cpp b/process.cpp
index 2de3016..38cec99 100644
--- a/process.cpp
+++ b/process.cpp
@@ -1,11 +1,10 @@
 #include <algorithm>
-#include <functional>
+#include <cmath>
 #include <iterator>
 #include <numeric>
 #include <stdexcept>
 #include <sstream>
 #include <xbt/log.h>
-#include <xbt/time.h>
 
 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(proc);
 
@@ -15,10 +14,19 @@ XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(proc);
 
 #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)
@@ -36,30 +44,52 @@ 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());
     for (unsigned i = 0 ; i < neigh.size() ; i++) {
         neighbor* ptr = &neigh[i];
-        m_host_t host = MSG_get_host_by_name(ptr->get_name());
+        msg_host_t host = MSG_get_host_by_name(ptr->get_name());
         pneigh.push_back(ptr);
         rev_neigh.insert(std::make_pair(host, ptr));
     }
 
     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));
+    lb_thread = new_msg_thread("loba", [this]() { this->load_balance_loop(); });
 
     e_xbt_log_priority_t logp = xbt_log_priority_verbose;
     if (!LOG_ISENABLED(logp))
@@ -70,7 +100,7 @@ process::process(int argc, char* argv[])
         oss << ESSE(neigh.size()) << ": ";
         std::transform(neigh.begin(), neigh.end() - 1,
                        std::ostream_iterator<const char*>(oss, ", "),
-                       std::mem_fn(&neighbor::get_name));
+                       [](const neighbor& neigh) { return neigh.get_name(); });
         oss << neigh.back().get_name();
     }
     XBT_LOG(logp, "Got %s.", oss.str().c_str());
@@ -80,15 +110,39 @@ process::process(int argc, char* argv[])
 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()
@@ -114,8 +168,6 @@ int process::run()
 
 void process::load_balance_loop()
 {
-    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) {
@@ -127,13 +179,16 @@ 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);
         }
 
@@ -144,20 +199,19 @@ void process::load_balance_loop()
 
         // send
         comm.ctrl_flush(false);
-        std::for_each(neigh.begin(), neigh.end(),
-                      std::bind(&process::ctrl_send, this, _1));
+        for (neighbor& n : neigh)
+            ctrl_send(n);
         prev_load_broadcast = 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__);
     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));
+    for (neighbor& n : neigh)
+        ctrl_close(n);
     while (ctrl_close_pending) {
         comm.ctrl_flush(false);
         XBT_DEBUG("waiting for %d CTRL_CLOSE", ctrl_close_pending);
@@ -168,44 +222,52 @@ void process::load_balance_loop()
 
 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 (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);
         mutex.acquire();
         real_load += received_load;
         received_load = 0.0;
-        std::for_each(neigh.begin(), neigh.end(),
-                      std::bind(&process::data_send, this, _1));
+        for (neighbor& n : neigh)
+            data_send(n);
         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);
-        TRACE_msg_set_task_category(task, TRACE_CAT_COMP);
+        msg_task_t task = MSG_task_create("computation", flops, 0.0, nullptr);
+        // MSG_task_set_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__);
+    // Note: idle duration is not counted during finalization
     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));
+    for (neighbor& n : neigh)
+        data_close(n);
     while (data_close_pending) {
         comm.data_flush(false);
         XBT_DEBUG("waiting for %d DATA_CLOSE", data_close_pending);
@@ -213,10 +275,39 @@ void process::compute_loop()
     }
     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;
@@ -240,6 +331,10 @@ bool process::still_running()
         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;
@@ -249,7 +344,7 @@ bool process::still_running()
         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.");
@@ -261,12 +356,10 @@ bool process::still_running()
 
 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<double>(), _1,
-                                     std::bind(&neighbor::get_to_send, _2)));
+                           [](double x, const neighbor& neigh) {
+                               return x + neigh.get_to_send();
+                           });
 }
 
 void process::load_balance()
@@ -296,39 +389,55 @@ void process::ctrl_send(neighbor& nb)
         debt_to_send = 0.0;
     }
     if (info_to_send != prev_load_broadcast || debt_to_send > 0.0) {
-        message* msg = new message(message::CTRL, info_to_send, debt_to_send);
+        message* msg =
+            new message(message::message_type::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) {
-        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;
+        if (nb.get_credit() > 0.0)
+            balance = nb.get_debt() - nb.get_credit();
+        else
+            balance = nb.get_debt();
+        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)
             amount = std::min(load_to_send, opt::max_transfer_amount);
         else
             amount = load_to_send;
-        message* msg = new message(message::DATA, amount);
+        message* msg = new message(message::message_type::DATA, amount);
         add_data_send_mesg(msg->get_size());
         comm.data_send(nb.get_data_mbox(), msg);
         load_to_send -= amount;
@@ -337,22 +446,24 @@ void process::data_send(neighbor& nb)
 
 void process::ctrl_close(neighbor& nb)
 {
-    comm.ctrl_send(nb.get_ctrl_mbox(), new message(message::CTRL_CLOSE, 0.0));
+    comm.ctrl_send(nb.get_ctrl_mbox(),
+                   new message(message::message_type::CTRL_CLOSE, 0.0));
 }
 
 void process::data_close(neighbor& nb)
 {
-    comm.data_send(nb.get_data_mbox(), new message(message::DATA_CLOSE, 0.0));
+    comm.data_send(nb.get_data_mbox(),
+                   new message(message::message_type::DATA_CLOSE, 0.0));
 }
 
 void process::ctrl_receive(double timeout)
 {
     message* msg;
-    m_host_t from;
+    msg_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)
+        if (msg->get_type() != message::message_type::CTRL_CLOSE)
             add_ctrl_recv_mesg(msg->get_size());
         handle_message(msg, from);
         timeout = 0.0;
@@ -362,36 +473,42 @@ void process::ctrl_receive(double timeout)
 void process::data_receive(double timeout)
 {
     message* msg;
-    m_host_t from;
+    msg_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)
+        if (msg->get_type() != message::message_type::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)
+void process::handle_message(message* msg, msg_host_t from)
 {
     switch (msg->get_type()) {
-    case message::CTRL: {
+    case message::message_type::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: {
+    case message::message_type::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:
+    case message::message_type::CTRL_CLOSE:
         ctrl_close_pending--;
         close_received = true;
         break;
-    case message::DATA_CLOSE:
+    case message::message_type::DATA_CLOSE:
         data_close_pending--;
         close_received = true;
         break;
@@ -399,27 +516,28 @@ void process::handle_message(message* msg, m_host_t from)
     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);
+    if (!_XBT_LOG_ISENABLEDV((*cat), logp))
+        return;
+    XBT_XCLOG(cat, logp, "My load: %g (real); %g (expected).  Neighbor loads:",
+              real_load, expected_load);
+    for (const neighbor& n : neigh)
+        n.print(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);
+    if (!_XBT_LOG_ISENABLEDV((*cat), logp))
+        return;
+    XBT_XCLOG(cat, logp, "My load: %g (real); %g (expected).  Neighbor loads:",
+              real_load, expected_load);
+    for (const neighbor* n : pneigh)
+        n->print(verbose, logp, cat);
 }
 
 #undef print_loads_generic