process.h

   1 #ifndef PROCESS_H
   2 #define PROCESS_H
   3
   4 #define USE_UNORDERED_MAP 1
   5 //#undef USE_UNORDERED_MAP
   6
   7 #include <algorithm>
   8 #include <tr1/functional>
   9 #ifdef USE_UNORDERED_MAP
  10 #  include <tr1/unordered_map>
  11 #  define MAP_TEMPLATE std::tr1::unordered_map
  12 #else
  13 #  include <map>
  14 #  define MAP_TEMPLATE std::map
  15 #endif
  16 #include <vector>
  17 #include <msg/msg.h>
  18 #include <xbt/log.h>
  19 #include "communicator.h"
  20 #include "misc.h"
  21 #include "msg_thread.h"
  22 #include "neighbor.h"
  23 #include "options.h"
  24
  25 class process {
  26 public:
  27     static double get_total_load_init()    { return total_load_init;    }
  28     static double get_total_load_running() { return total_load_running; }
  29     static double get_total_load_exit()    { return total_load_exit;    }
  30
  31     process(int argc, char* argv[]);
  32     virtual ~process();
  33
  34     double get_comp() const                { return comp; }
  35     double get_real_load() const           { return real_load; }
  36
  37     int run();
  38
  39 protected:
  40     typedef std::vector<neighbor> neigh_type;
  41     typedef std::vector<neighbor*> pneigh_type;
  42
  43     pneigh_type pneigh;         // list of pointers to neighbors that
  44                                 // we are free to reorder
  45
  46     // Get and set current load, which may be real load, or expected
  47     // load if opt::bookkeeping is true.
  48     double get_load() const;
  49     void set_load(double load);
  50
  51     // The load balancing algorithm comes here...
  52     virtual void load_balance();
  53
  54     // Register some amount of load to send to given neighbor.
  55     void send(neighbor& nb, double amount);
  56     void send(neighbor* nb, double amount) { send(*nb, amount); }
  57
  58     // Sort pneigh by applying comp to their loads
  59     template <typename Compare>
  60     void pneigh_sort_by_load(const Compare& comp);
  61
  62     // Calls neighbor::print(verbose, logp, cat) for each member of neigh.
  63     void print_loads(bool verbose = false,
  64                      e_xbt_log_priority_t logp = xbt_log_priority_info,
  65                      xbt_log_category_t cat = _XBT_LOGV(default)) const;
  66
  67     // Calls neighbor::print(verbose, logp, cat) for each member of pneigh.
  68     void print_loads_p(bool verbose = false,
  69                        e_xbt_log_priority_t logp = xbt_log_priority_info,
  70                        xbt_log_category_t cat = _XBT_LOGV(default)) const;
  71
  72 private:
  73     static double total_load_init; // sum of process loads at init
  74     static double total_load_running; // sum of loads while running
  75     static double total_load_exit; // sum of process loads at exit
  76
  77     typedef MAP_TEMPLATE<m_host_t, neighbor*> rev_neigh_type;
  78     neigh_type neigh;           // list of neighbors (do not alter
  79                                 // after construction!)
  80     rev_neigh_type rev_neigh;   // map m_host_t -> neighbor
  81
  82     communicator comm;          // communicator for this process
  83     int ctrl_close_pending;     // number of "close" messages to wait
  84                                 // on ctrl channel
  85     int data_close_pending;     // number of "close" messages to wait
  86                                 // on data channel
  87     bool close_received;        // true if we received a "close" message
  88     bool finalizing;            // true when finalize() is running
  89
  90     unsigned lb_iter;           // counter of load-balancing iterations
  91     unsigned comp_iter;         // counter of computation iterations
  92
  93     double comp;                // total computing done so far (flops)
  94
  95     double prev_load_broadcast; // used to ensure that we do not send
  96                                 // a same information messages
  97     double real_load;           // current load
  98     double expected_load;       // expected load in bookkeeping mode
  99
 100     // Load-balancing loop
 101     msg_thread* lb_thread;
 102     void load_balance_loop();
 103
 104     // Simulate computation loop
 105     void compute_loop();
 106
 107     bool still_running();
 108
 109     // Send procedures
 110     void ctrl_send(neighbor& nb);
 111     void data_send(neighbor& nb);
 112     void ctrl_close(neighbor& nb);
 113     void data_close(neighbor& nb);
 114
 115     // Receive procedure
 116     // Parameter "timeout" may be 0 for non-blocking operation, -1 for
 117     // infinite waiting, or any positive timeout.
 118     void ctrl_receive(double timeout);
 119     void data_receive(double timeout);
 120     void handle_message(message* msg, m_host_t from);
 121 };
 122
 123 inline
 124 double process::get_load() const
 125 {
 126     if (opt::bookkeeping)
 127         return expected_load;
 128     else
 129         return real_load;
 130 }
 131
 132 inline
 133 void process::set_load(double load)
 134 {
 135     if (opt::bookkeeping)
 136         expected_load = load;
 137     else
 138         real_load = load;
 139 }
 140
 141 template <typename Compare>
 142 void process::pneigh_sort_by_load(const Compare& comp)
 143 {
 144     using std::tr1::bind;
 145     using std::tr1::placeholders::_1;
 146     using std::tr1::placeholders::_2;
 147     std::sort(pneigh.begin(), pneigh.end(),
 148               bind(comp,
 149                    bind(&neighbor::get_load, _1),
 150                    bind(&neighbor::get_load, _2)));
 151 }
 152
 153 #endif // !PROCESS_H
 154
 155 // Local variables:
 156 // mode: c++
 157 // End: