Make opt::exit_on_convergence an unsigned int.

[loba.git] / process.cpp

diff --git a/process.cpp b/process.cpp
index 0f7380c8c4802a7cecf5f7498deb3deaa32c0863..97f2a69db2e943c01bfdb6e9187856aa073db947 100644 (file)
--- a/process.cpp
+++ b/process.cpp
@@ -16,10 +16,19 @@ XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(proc);
 
 #include "process.h"
 
 
 #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;
 
 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)
 namespace {
 
     void sleep_until_date(double& date, double duration)


@@ -56,15 +65,31 @@ process::process(int argc, char* argv[])
 
     prev_load_broadcast = -1;   // force sending of load on first send_all()
     expected_load = real_load;
 
     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;
 
     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;
 
     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",
                                std::bind(&process::load_balance_loop, this));


@@ -88,15 +113,39 @@ process::process(int argc, char* argv[])
 process::~process()
 {
     delete lb_thread;
 process::~process()
 {
     delete lb_thread;

+    proc_mutex->acquire();

     total_load_exit += real_load;
     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_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());
     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()
 }
 
 int process::run()


@@ -143,7 +192,8 @@ void process::load_balance_loop()
         // nothing to do with opt::bookkeeping
 
         if (opt::log_rate && lb_iter % opt::log_rate == 0) {
         // 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);
         }
 
             XBT_VERB("... expected load: %g", expected_load);
         }
 


@@ -180,9 +230,12 @@ void process::compute_loop()
     using std::placeholders::_1;
 
     double next_iter_after_date = MSG_get_clock() + opt::min_comp_iter_duration;
     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()) {
     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);
 
         // send
         comm.data_flush(false);


@@ -193,10 +246,14 @@ void process::compute_loop()
                       std::bind(&process::data_send, this, _1));
         mutex.release();
 
                       std::bind(&process::data_send, this, _1));
         mutex.release();
 

+        ++all_comp_iter;

         if (real_load == 0.0)
             continue;
 
         if (real_load == 0.0)
             continue;
 

+        convergence_check();
+

         // compute
         // 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);
         ++comp_iter;
         double flops = opt::comp_cost(real_load);
         m_task_t task = MSG_task_create("computation", flops, 0.0, NULL);


@@ -206,10 +263,13 @@ void process::compute_loop()
         add_comp_amount(flops);
         MSG_task_destroy(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__);
         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()));
     finalizing = true;
     XBT_DEBUG("send DATA_CLOSE to %zu neighbor%s",
               neigh.size(), ESSE(neigh.size()));


@@ -222,10 +282,39 @@ void process::compute_loop()
     }
     real_load += received_load;
     received_load = 0.0;
     }
     real_load += received_load;
     received_load = 0.0;

+    proc_mutex->acquire();

     total_load_running -= real_load;
     total_load_running -= real_load;

+    proc_mutex->release();
+    convergence_check();

     comm.data_flush(true);
 }
 
     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;
 bool process::still_running()
 {
     static bool last_status = true;


@@ -249,6 +338,10 @@ bool process::still_running()
         XBT_VERB("Reached comp_maxiter: %d/%d", comp_iter, opt::comp_maxiter);
         last_status = false;
 
         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;
     } else if (opt::exit_on_close && close_received) {
         XBT_VERB("Close received");
         last_status = false;


@@ -258,7 +351,7 @@ bool process::still_running()
         last_status = false;
 
     } else if (100.0 * total_load_running / total_load_init <=
         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.");
         // 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.");


@@ -321,16 +414,22 @@ double process::compute_load_to_send(double desired)
 void process::data_send(neighbor& nb)
 {
     double load_to_send;
 void process::data_send(neighbor& nb)
 {
     double load_to_send;

-    if (opt::bookkeeping) {
-        double excess_load = real_load - expected_load;
-        if (excess_load > 0.0) {
-            load_to_send = compute_load_to_send(std::min(excess_load,
-                                                         nb.get_debt()));
-            if (load_to_send > 0.0)
-                nb.set_debt(nb.get_debt() - load_to_send);
-        } else
-            load_to_send = 0.0;
-    } else {
+    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);
         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);


@@ -393,12 +492,18 @@ 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());
     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: {
         break;
     }
     case message::DATA: {

+        neighbor* n = rev_neigh[from];

         double ld = msg->get_amount();
         received_load += ld;
         double ld = msg->get_amount();
         received_load += ld;

+        n->set_credit(n->get_credit() - ld);

         break;
     }
     case message::CTRL_CLOSE:
         break;
     }
     case message::CTRL_CLOSE: