process.cpp

   1 #include <algorithm>
   2 #include <functional>
   3 #include <iterator>
   4 #include <stdexcept>
   5 #include <sstream>
   6 #include <xbt/log.h>
   7 #include <xbt/time.h>
   8 #include "misc.h"
   9 #include "options.h"
  10 #include "process.h"
  11
  12 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(simu);
  13
  14 process::process(int argc, char* argv[])
  15 {
  16     if (argc < 2 || !(std::istringstream(argv[1]) >> load))
  17         throw std::invalid_argument("bad or missing initial load");
  18     neigh.assign(argv + 2, argv + argc);
  19     expected_load = load;
  20     e_xbt_log_priority_t logp = xbt_log_priority_verbose;
  21     if (!LOG_ISENABLED(logp))
  22         return;
  23     LOG1(logp, "My initial load is: %g", load);
  24     std::ostringstream oss;
  25     oss << neigh.size() << " neighbor";
  26     if (!neigh.empty()) {
  27         oss << (neigh.size() > 1 ? "s: " : ": ");
  28         std::transform(neigh.begin(), neigh.end() - 1,
  29                        std::ostream_iterator<const char*>(oss, ", "),
  30                        std::mem_fun_ref(&neighbor::get_name));
  31         oss << neigh.back().get_name();
  32     }
  33     LOG1(logp, "Got %s.", oss.str().c_str());
  34     print_loads(logp);
  35 }
  36
  37 int process::run()
  38 {
  39     INFO0("Coucou !");
  40
  41     int n = 100;
  42     while (n--) {
  43         if (load > 0)
  44             compute();
  45         else
  46             xbt_sleep(0.5);     // fixme
  47         receive();
  48     }
  49     //    MSG_process_sleep(100.0);   // xxx
  50     /* xxx:
  51      * while (there is something to do) {
  52      *    compute some task;
  53      *    get received tasks;
  54      *    compute load balancing;
  55      *    send tasks to neighbors;
  56      * }
  57      */
  58
  59     /* Open Questions :
  60      * - definition of load on heterogeneous hosts ?
  61      * - how to detect convergence ?
  62      * - how to manage link failures ?
  63      */
  64
  65     // xxx: shall we retrieve pending tasks?
  66
  67     return 0;
  68 }
  69
  70 void process::receive()
  71 {
  72     bool received;
  73     do {
  74         double amount;
  75         m_host_t from;
  76         received = false;
  77         if (comm.recv_info(amount, from)) {
  78             // fixme: update neighbor
  79             received = true;
  80         }
  81         if (comm.recv_credit(amount, from)) {
  82             expected_load += amount;
  83             received = true;
  84         }
  85         if (comm.recv_load(amount, from)) {
  86             load += amount;
  87             received = true;
  88         }
  89     } while (received);
  90 }
  91
  92 void process::compute()
  93 {
  94     double duration = opt::comp_cost(load);
  95     m_task_t task = MSG_task_create("computation", duration, 0.0, NULL);
  96     DEBUG2("Compute %g flop%s.", duration, duration > 1 ? "s" : "");
  97     MSG_task_execute(task);
  98     MSG_task_destroy(task);
  99 }
 100
 101 void process::print_loads(e_xbt_log_priority_t logp)
 102 {
 103     if (!LOG_ISENABLED(logp))
 104         return;
 105     std::ostringstream oss;
 106     if (neigh.empty()) {
 107         oss << "no neighbor!";
 108     } else {
 109         std::transform(neigh.begin(), neigh.end() - 1,
 110                        std::ostream_iterator<double>(oss, ", "),
 111                        std::mem_fun_ref(&neighbor::get_load));
 112         oss << neigh.back().get_load();
 113     }
 114     LOG1(logp, "Neighbor loads: %s", oss.str().c_str());
 115 }
 116
 117 // Local variables:
 118 // mode: c++
 119 // End: