src/smpi/smpi_sender.c

   1 #include "private.h"
   2
   3 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(smpi_sender, smpi, "Logging specific to SMPI (sender)");
   4
   5 int smpi_sender(int argc, char **argv)
   6 {
   7         smx_process_t self;
   8         smx_host_t shost;
   9
  10         int index;
  11
  12         xbt_fifo_t request_queue;
  13         smx_mutex_t request_queue_mutex;
  14
  15         int running_hosts_count;
  16
  17         smpi_mpi_request_t request;
  18
  19         smx_host_t dhost;
  20
  21         smx_action_t action;
  22
  23         e_surf_action_state_t state;
  24
  25         smpi_received_message_t message;
  26
  27         int dindex;
  28
  29         smx_process_t receiver_process;
  30
  31         self  = SIMIX_process_self();
  32         shost = SIMIX_host_self();
  33
  34         // make sure root is done before own initialization
  35         SIMIX_mutex_lock(smpi_global->start_stop_mutex);
  36         while (!smpi_global->root_ready) {
  37                 SIMIX_cond_wait(smpi_global->start_stop_cond, smpi_global->start_stop_mutex);
  38         }
  39         SIMIX_mutex_unlock(smpi_global->start_stop_mutex);
  40
  41         index = smpi_host_index();
  42
  43         request_queue       = smpi_global->pending_send_request_queues[index];
  44         request_queue_mutex = smpi_global->pending_send_request_queues_mutexes[index];
  45
  46         smpi_global->sender_processes[index] = self;
  47
  48         // wait for all nodes to signal initializatin complete
  49         SIMIX_mutex_lock(smpi_global->start_stop_mutex);
  50         smpi_global->ready_process_count++;
  51         if (smpi_global->ready_process_count >= 3 * smpi_global->host_count) {
  52                 SIMIX_cond_broadcast(smpi_global->start_stop_cond);
  53         }
  54         while (smpi_global->ready_process_count < 3 * smpi_global->host_count) {
  55                 SIMIX_cond_wait(smpi_global->start_stop_cond, smpi_global->start_stop_mutex);
  56         }
  57         SIMIX_mutex_unlock(smpi_global->start_stop_mutex);
  58
  59         do {
  60
  61                 SIMIX_mutex_lock(request_queue_mutex);
  62                 request = xbt_fifo_shift(request_queue);
  63                 SIMIX_mutex_unlock(request_queue_mutex);
  64
  65                 if (NULL == request) {
  66                         SIMIX_process_suspend(self);
  67                 } else {
  68
  69                         message          = xbt_mallocator_get(smpi_global->message_mallocator);
  70
  71                         SIMIX_mutex_lock(request->mutex);
  72
  73                         message->comm    = request->comm;
  74                         message->src     = request->comm->index_to_rank_map[index];
  75                         message->tag     = request->tag;
  76                         message->data    = request->data;
  77                         message->buf     = xbt_malloc(request->datatype->size * request->count);
  78                         memcpy(message->buf, request->buf, request->datatype->size * request->count);
  79
  80                         dindex = request->comm->rank_to_index_map[request->dst];
  81                         dhost  = smpi_global->hosts[dindex];
  82
  83                         message->forward = (request->forward - 1) / 2;
  84                         request->forward = request->forward / 2;
  85
  86                         if (0 < request->forward) {
  87                                 request->dst = (request->dst + message->forward + 1) % request->comm->size;
  88                                 SIMIX_mutex_lock(request_queue_mutex);
  89                                 xbt_fifo_push(request_queue, request);
  90                                 SIMIX_mutex_unlock(request_queue_mutex);
  91                         } else {
  92                                 request->completed = 1;
  93                         }
  94
  95                         action = SIMIX_action_communicate(shost, dhost, "communication", request->datatype->size * request->count, -1.0);
  96
  97                         SIMIX_register_action_to_condition(action, request->cond);
  98
  99                         for (
 100                                 state  = SIMIX_action_get_state(action);
 101                                 state == SURF_ACTION_READY ||
 102                                 state == SURF_ACTION_RUNNING;
 103                                 state  = SIMIX_action_get_state(action)
 104                         ) {
 105                                 SIMIX_cond_wait(request->cond, request->mutex);
 106                         }
 107
 108                         SIMIX_unregister_action_to_condition(action, request->cond);
 109                         SIMIX_action_destroy(action);
 110
 111                         SIMIX_mutex_unlock(request->mutex);
 112
 113                         SIMIX_mutex_lock(smpi_global->received_message_queues_mutexes[dindex]);
 114                         xbt_fifo_push(smpi_global->received_message_queues[dindex], message);
 115                         SIMIX_mutex_unlock(smpi_global->received_message_queues_mutexes[dindex]);
 116
 117                         // wake up receiver if necessary
 118                         receiver_process = smpi_global->receiver_processes[dindex];
 119                         if (SIMIX_process_is_suspended(receiver_process)) {
 120                                 SIMIX_process_resume(receiver_process);
 121                         }
 122
 123                 }
 124
 125                 SIMIX_mutex_lock(smpi_global->running_hosts_count_mutex);
 126                 running_hosts_count = smpi_global->running_hosts_count;
 127                 SIMIX_mutex_unlock(smpi_global->running_hosts_count_mutex);
 128
 129         } while (0 < running_hosts_count);
 130
 131         return 0;
 132 }