Bug fix: only send to a lesser loaded neighbor!

[loba.git] / process.cpp

diff --git a/process.cpp b/process.cpp
index a24d6ebcbfb5eae01f098611a3373a00f06a872f..a74b1149fcdc406358c7ad320aafd85a337d05af 100644 (file)
--- a/process.cpp
+++ b/process.cpp
@@ -1,7 +1,6 @@
 #include <algorithm>
 #include <tr1/functional>
 #include <iterator>
 #include <algorithm>
 #include <tr1/functional>
 #include <iterator>

-#include <numeric>

 #include <stdexcept>
 #include <sstream>
 #include <xbt/log.h>
 #include <stdexcept>
 #include <sstream>
 #include <xbt/log.h>


@@ -11,15 +10,17 @@ XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(proc);
 
 #include "misc.h"
 #include "options.h"
 
 #include "misc.h"
 #include "options.h"

+#include "tracing.h"

 
 #include "process.h"
 
 double process::total_load_init = 0.0;
 
 #include "process.h"
 
 double process::total_load_init = 0.0;

+double process::total_load_running = 0.0;

 double process::total_load_exit = 0.0;
 
 process::process(int argc, char* argv[])
 {
 double process::total_load_exit = 0.0;
 
 process::process(int argc, char* argv[])
 {

-    if (argc < 2 || !(std::istringstream(argv[1]) >> load))
+    if (argc < 2 || !(std::istringstream(argv[1]) >> real_load))

         throw std::invalid_argument("bad or missing initial load parameter");
 
     neigh.assign(argv + 2, argv + argc);
         throw std::invalid_argument("bad or missing initial load parameter");
 
     neigh.assign(argv + 2, argv + argc);


@@ -32,20 +33,16 @@ process::process(int argc, char* argv[])
         rev_neigh.insert(std::make_pair(host, ptr));
     }
 
         rev_neigh.insert(std::make_pair(host, ptr));
     }
 

-    prev_load_broadcast = -1;   // force sending of load on first send()
-    expected_load = load;
-    total_load_init += load;
+    comp = 0.0;
+
+    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;

 
     ctrl_close_pending = data_close_pending = neigh.size();
 
     ctrl_close_pending = data_close_pending = neigh.size();

-    if (neigh.size() == 1) {
-        comm.next_close_on_ctrl_is_last();
-        comm.next_close_on_data_is_last();
-    }

     close_received = false;
     close_received = false;

-    may_receive =  (neigh.size() > 0); // the same as (ctrl_close_pending ||
-                                       //              data_close_pending)
-    if (may_receive)
-        comm.listen();
+    finalizing = false;

 
     e_xbt_log_priority_t logp = xbt_log_priority_verbose;
     if (!LOG_ISENABLED(logp))
 
     e_xbt_log_priority_t logp = xbt_log_priority_verbose;
     if (!LOG_ISENABLED(logp))


@@ -60,65 +57,110 @@ process::process(int argc, char* argv[])
         oss << neigh.back().get_name();
     }
     LOG1(logp, "Got %s.", oss.str().c_str());
         oss << neigh.back().get_name();
     }
     LOG1(logp, "Got %s.", oss.str().c_str());

-    print_loads(true, logp);
+    print_loads(false, logp);

 }
 
 process::~process()
 {
 }
 
 process::~process()
 {

-    total_load_exit += load;
+    total_load_exit += real_load;
+    if (opt::bookkeeping) {
+        INFO4("Final load after %d:%d iterations: %g ; expected: %g",
+              lb_iter, comp_iter, real_load, expected_load);
+    } else {
+        INFO2("Final load after %d iterations: %g",
+              lb_iter, real_load);
+        if (lb_iter != comp_iter)
+            WARN2("lb_iter (%d) and comp_iter (%d) differ!",
+                  lb_iter, comp_iter);
+    }
+    VERB1("Total computation for this process: %g", comp);

 }
 
 int process::run()
 {
 }
 
 int process::run()
 {

-    INFO1("Initial load: %g", load);
+    double next_iter_after_date = 0.0;
+    INFO1("Initial load: %g", real_load);

     VERB0("Starting...");
     VERB0("Starting...");

-    iter = 0;
-    bool one_more = true;
-    do {
-        ++iter;
-
-        if (opt::log_rate && iter % opt::log_rate == 0) {
-            if (opt::bookkeeping)
-                INFO3("(%u) current load: %g ; expected: %g",
-                      iter, load, expected_load);
-            else
-                INFO2("(%u) current load: %g",
-                      iter, load);
+    comp_iter = lb_iter = 0;
+    while (true) {
+        double ld = get_load();
+        if (ld > 0.0) {
+            double now = MSG_get_clock();
+            if (now < next_iter_after_date)
+                MSG_process_sleep(next_iter_after_date - now);
+            next_iter_after_date = MSG_get_clock() + opt::min_iter_duration;
+
+            ++lb_iter;
+
+            if (opt::log_rate && lb_iter % opt::log_rate == 0) {
+                if (opt::bookkeeping)
+                    INFO4("(%u:%u) current load: %g ; expected: %g",
+                          lb_iter, comp_iter, real_load, expected_load);
+                else
+                    INFO2("(%u) current load: %g",
+                          lb_iter, real_load);
+            }
+
+            ld -= load_balance(ld);
+
+            print_loads(true, xbt_log_priority_debug);

         }
         }

-        print_loads(true, xbt_log_priority_debug);
-
-        if (opt::bookkeeping)
-            expected_load -= load_balance(expected_load);
-        else
-            load -= load_balance(load);
-
-        send();
-        compute();
+        set_load(ld);

 
 

-// NDS for Need To Send
-#define NDS ((opt::bookkeeping ? expected_load : load) != prev_load_broadcast)
-        do {
-            // General idea: block on receiving unless there is
-            // something to compute, or to send, or we must exit.
+        // send load information, and load (data) if any
+        send_all();
+        if (real_load > 0.0) {
+            ++comp_iter;
+            compute();
+        }

 
 

-            // fixme: review this chunk, and remove this NDS macro!
+        if (opt::lb_maxiter && lb_iter >= opt::lb_maxiter) {
+            VERB2("Reached lb_maxiter: %d/%d", lb_iter, opt::lb_maxiter);
+            break;
+        }
+        if (opt::comp_maxiter && comp_iter >= opt::comp_maxiter) {
+            VERB2("Reached comp_maxiter: %d/%d", comp_iter, opt::comp_maxiter);
+            break;
+        }
+        if (opt::time_limit && MSG_get_clock() >= opt::time_limit) {
+            VERB2("Reached time limit: %g/%g", MSG_get_clock(), opt::time_limit);
+            break;
+        }

 
 

-            // FIXME: HAD A DEADLOCK HERE...
+        // block on receiving unless there is something to compute or
+        // to send
+        double timeout;
+        if (real_load != 0 || get_load() != prev_load_broadcast)
+            timeout = 0.0;
+        else if (opt::min_iter_duration)
+            timeout = opt::min_iter_duration;
+        else
+            timeout = 1.0;
+        receive(timeout);

 
 

-            bool recv_wait = (load == 0 && !NDS);
-            DEBUG1("CALL RECEIVE(%s)", recv_wait? "WAIT": "NO_WAIT");
-            receive(recv_wait? WAIT: NO_WAIT);
+        // one of our neighbor is finalizing
+        if (opt::exit_on_close && close_received) {
+            VERB0("Close received");
+            break;
+        }

 
 

-            if (opt::exit_on_close && close_received)
-                one_more = false;
-            else if (opt::maxiter && iter >= opt::maxiter)
-                one_more = false;
-            
-        } while (one_more && may_receive && load == 0 && !NDS);
-        DEBUG0("RECEIVE LOOP ENDED");
-#undef NDS
+        // have no load and cannot receive anything
+        if (real_load == 0.0 && !may_receive()) {
+            VERB0("I'm a poor lonesome process, and I have no load...");
+            break;
+        }

 
 

-    } while (one_more);
+        // fixme: this check should be implemented with a distributed
+        // algorithm, and not a shared global variable!
+        // fixme: should this chunk be moved before call to receive() ?
+        if (100.0 * total_load_running / total_load_init <=
+            opt::load_ratio_threshold) {
+            VERB0("No more load to balance in system.");
+            break;
+        } else {
+            DEBUG1("still %g load to balance, continuing...", total_load_running);
+        }
+    }

     VERB0("Going to finalize...");
     finalize();
 
     VERB0("Going to finalize...");
     finalize();
 


@@ -129,36 +171,25 @@ int process::run()
      */
 
     VERB0("Done.");
      */
 
     VERB0("Done.");

-    INFO3("Final load after %d iteration%s: %g", iter, ESSE(iter), load);
-    if (opt::bookkeeping)
-        INFO1("Expected load: %g", expected_load);

     return 0;
 }
 
     return 0;
 }
 

-double process::sum_of_to_send() const
-{
-    using namespace std::tr1;
-    using namespace std::tr1::placeholders;
-
-    return std::accumulate(neigh.begin(), neigh.end(), 0.0,
-                           bind(std::plus<double>(),
-                                _1, bind(&neighbor::get_to_send, _2)));
-}
-

 double process::load_balance(double /*my_load*/)
 {
 double process::load_balance(double /*my_load*/)
 {

-    if (iter == 1)
-        WARN0("process::load_balance is a no-op!");
+    if (lb_iter == 1)           // warn only once
+        WARN0("process::load_balance() is a no-op!");

     return 0.0;
 }
 
 void process::compute()
 {
     return 0.0;
 }
 
 void process::compute()
 {

-    if (load > 0.0) {
-        double duration = opt::comp_cost(load);
-        m_task_t task = MSG_task_create("computation", duration, 0.0, NULL);
-        DEBUG2("compute %g flop%s.", duration, ESSE(duration));
+    if (real_load > 0.0) {
+        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);
+        DEBUG2("compute %g flop%s", flops, ESSE(flops));

         MSG_task_execute(task);
         MSG_task_execute(task);

+        comp += flops;

         MSG_task_destroy(task);
     } else {
         DEBUG0("nothing to compute !");
         MSG_task_destroy(task);
     } else {
         DEBUG0("nothing to compute !");


@@ -167,8 +198,8 @@ void process::compute()
 
 void process::send1_no_bookkeeping(neighbor& nb)
 {
 
 void process::send1_no_bookkeeping(neighbor& nb)
 {

-    if (load != prev_load_broadcast)
-        comm.send(nb.get_ctrl_mbox(), new message(message::INFO, load));
+    if (real_load != prev_load_broadcast)
+        comm.send(nb.get_ctrl_mbox(), new message(message::INFO, real_load));

     double load_to_send = nb.get_to_send();
     if (load_to_send > 0.0) {
         comm.send(nb.get_data_mbox(), new message(message::LOAD, load_to_send));
     double load_to_send = nb.get_to_send();
     if (load_to_send > 0.0) {
         comm.send(nb.get_data_mbox(), new message(message::LOAD, load_to_send));


@@ -192,23 +223,23 @@ void process::send1_bookkeeping(neighbor& nb)
     } else {
         new_debt = nb.get_debt();
     }
     } else {
         new_debt = nb.get_debt();
     }

-    if (load <= new_debt) {
-        load_to_send = load;
+    if (real_load <= new_debt) {
+        load_to_send = real_load;

         nb.set_debt(new_debt - load_to_send);
         nb.set_debt(new_debt - load_to_send);

-        load = 0.0;
+        real_load = 0.0;

     } else {
         load_to_send = new_debt;
         nb.set_debt(0.0);
     } else {
         load_to_send = new_debt;
         nb.set_debt(0.0);

-        load -= load_to_send;
+        real_load -= load_to_send;

     }
     if (load_to_send > 0.0)
         comm.send(nb.get_data_mbox(), new message(message::LOAD, load_to_send));
 }
 
     }
     if (load_to_send > 0.0)
         comm.send(nb.get_data_mbox(), new message(message::LOAD, load_to_send));
 }
 

-void process::send()
+void process::send_all()

 {
 {

-    using namespace std::tr1;
-    using namespace std::tr1::placeholders;
+    using std::tr1::bind;
+    using std::tr1::placeholders::_1;

 
     if (opt::bookkeeping) {
         std::for_each(neigh.begin(), neigh.end(),
 
     if (opt::bookkeeping) {
         std::for_each(neigh.begin(), neigh.end(),


@@ -217,18 +248,18 @@ void process::send()
     } else {
         std::for_each(neigh.begin(), neigh.end(),
                       bind(&process::send1_no_bookkeeping, this, _1));
     } else {
         std::for_each(neigh.begin(), neigh.end(),
                       bind(&process::send1_no_bookkeeping, this, _1));

-        prev_load_broadcast = load;
+        prev_load_broadcast = real_load;

     }
     }

+    comm.flush(false);

 }
 
 }
 

-void process::receive(recv_wait_mode wait)
+void process::receive(double timeout)

 {
 {

-    // DEBUG1("go for receive(%s)",
-    //        "NO_WAIT\0WAIT\0\0\0\0WAIT_FOR_CLOSE" + 8 * wait);

     message* msg;
     m_host_t from;
     message* msg;
     m_host_t from;

-    bool do_loop = may_receive;
-    while (do_loop && comm.recv(msg, from, wait)) {
+
+    DEBUG2("%sblocking receive (%g)", "\0non-" + !timeout, timeout);
+    while (may_receive() && comm.recv(msg, from, timeout)) {

         switch (msg->get_type()) {
         case message::INFO: {
             neighbor* n = rev_neigh[from];
         switch (msg->get_type()) {
         case message::INFO: {
             neighbor* n = rev_neigh[from];


@@ -238,55 +269,61 @@ void process::receive(recv_wait_mode wait)
         case message::CREDIT:
             expected_load += msg->get_amount();
             break;
         case message::CREDIT:
             expected_load += msg->get_amount();
             break;

-        case message::LOAD:
-            load += msg->get_amount();
+        case message::LOAD: {
+            double ld = msg->get_amount();
+            real_load += ld;
+            if (finalizing)
+                total_load_running -= ld;

             break;
             break;

+        }

         case message::CTRL_CLOSE:
         case message::CTRL_CLOSE:

-            if (--ctrl_close_pending == 1)
-                comm.next_close_on_ctrl_is_last();
-            // DEBUG1("ctrl_close_pending = %d", ctrl_close_pending);
+            ctrl_close_pending--;

             close_received = true;
             break;
         case message::DATA_CLOSE:
             close_received = true;
             break;
         case message::DATA_CLOSE:

-            if (--data_close_pending == 1)
-                comm.next_close_on_data_is_last();
-            // DEBUG1("data_close_pending = %d", data_close_pending);
+            data_close_pending--;

             close_received = true;
             break;
         }
         delete msg;
             close_received = true;
             break;
         }
         delete msg;

-        may_receive = (ctrl_close_pending || data_close_pending);
-        do_loop = (wait == WAIT_FOR_CLOSE) && may_receive;
+        timeout = 0.0;          // only wait on first recv

     }
     }

+    comm.flush(false);

 }
 
 void process::finalize1(neighbor& nb)
 {
     comm.send(nb.get_ctrl_mbox(), new message(message::CTRL_CLOSE, 0.0));
 }
 
 void process::finalize1(neighbor& nb)
 {
     comm.send(nb.get_ctrl_mbox(), new message(message::CTRL_CLOSE, 0.0));

-    comm.send(nb.get_data_mbox(), new message(message::DATA_CLOSE, 0.0));    
+    comm.send(nb.get_data_mbox(), new message(message::DATA_CLOSE, 0.0));

 }
 
 void process::finalize()
 {
 }
 
 void process::finalize()
 {

-    using namespace std::tr1;
-    using namespace std::tr1::placeholders;
+    using std::tr1::bind;
+    using std::tr1::placeholders::_1;
+
+    finalizing = true;
+    total_load_running -= real_load;

 
 

-    DEBUG2("send CLOSE to %d neighbor%s.",
-           (int )neigh.size(), ESSE(neigh.size()));
+    DEBUG2("send CLOSE to %lu neighbor%s",
+           (unsigned long )neigh.size(), ESSE(neigh.size()));

     std::for_each(neigh.begin(), neigh.end(),
                   bind(&process::finalize1, this, _1));
 
     std::for_each(neigh.begin(), neigh.end(),
                   bind(&process::finalize1, this, _1));
 

-    DEBUG2("wait for CLOSE from %d neighbor%s.",
-           (int )neigh.size(), ESSE(neigh.size()));
-    receive(WAIT_FOR_CLOSE);
+    DEBUG2("wait for CLOSE from %lu neighbor%s",
+           (unsigned long )neigh.size(), ESSE(neigh.size()));
+    while (may_receive()) {
+        comm.flush(false);
+        receive(-1.0);
+    }

 
     comm.flush(true);
 }
 
 #define print_loads_generic(vec, verbose, logp, cat)                    \
     if (_XBT_LOG_ISENABLEDV((*cat), logp)) {                            \
 
     comm.flush(true);
 }
 
 #define print_loads_generic(vec, verbose, logp, cat)                    \
     if (_XBT_LOG_ISENABLEDV((*cat), logp)) {                            \

-        using namespace std::tr1;                                       \
-        using namespace std::tr1::placeholders;                         \
+        using std::tr1::bind;                                           \
+        using std::tr1::placeholders::_1;                               \

         XCLOG0(cat, logp, "Neighbor loads:");                           \
         std::for_each(vec.begin(), vec.end(),                           \
                       bind(&neighbor::print, _1, verbose, logp, cat));  \
         XCLOG0(cat, logp, "Neighbor loads:");                           \
         std::for_each(vec.begin(), vec.end(),                           \
                       bind(&neighbor::print, _1, verbose, logp, cat));  \