X-Git-Url: https://bilbo.iut-bm.univ-fcomte.fr/and/gitweb/loba.git/blobdiff_plain/e53538eff3dccb0bf53d2f3916659f991ae6f6b8..9539c77f2b5e0eef8d06da7a7ddd1d5546ba0731:/process.cpp

diff --git a/process.cpp b/process.cpp
index 193c87b..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)
@@ -37,6 +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());
@@ -47,17 +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));
@@ -86,10 +107,17 @@ 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);
 }
 
 int process::run()
@@ -136,7 +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);
         }
 
@@ -174,20 +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();
+
+            ++all_comp_iter;
+
+        } while (real_load == 0.0);
 
-        if (real_load == 0.0)
-            continue;
+        convergence_check();
 
         // compute
         ++comp_iter;
@@ -216,9 +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;
@@ -314,11 +371,22 @@ double process::compute_load_to_send(double desired)
 void process::data_send(neighbor& nb)
 {
     double load_to_send;
-    if (opt::bookkeeping) {
-        load_to_send = compute_load_to_send(std::min(real_load, nb.get_debt()));
+    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 {
+    } 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);
@@ -381,12 +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: