src/smpi/smpi_sender.c

   1 #include "private.h"
   2
   3 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(smpi_sender, smpi,
   4                                 "Logging specific to SMPI (sender)");
   5
   6 int smpi_sender(int argc, char **argv)
   7 {
   8   smx_process_t self;
   9   smx_host_t shost;
  10
  11   int index;
  12
  13   xbt_fifo_t request_queue;
  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   index = smpi_host_index();
  35
  36   request_queue = smpi_global->pending_send_request_queues[index];
  37
  38   smpi_global->sender_processes[index] = self;
  39
  40   do {
  41
  42     request = xbt_fifo_shift(request_queue);
  43
  44     if (NULL == request) {
  45       SIMIX_process_suspend(self);
  46     } else {
  47
  48       message = xbt_mallocator_get(smpi_global->message_mallocator);
  49
  50       SIMIX_mutex_lock(request->mutex);
  51
  52       message->comm = request->comm;
  53       message->src = request->comm->index_to_rank_map[index];
  54       message->tag = request->tag;
  55       message->data = request->data;
  56       message->buf = xbt_malloc(request->datatype->size * request->count);
  57       memcpy(message->buf, request->buf,
  58              request->datatype->size * request->count);
  59
  60       dindex = request->comm->rank_to_index_map[request->dst];
  61       dhost = smpi_global->hosts[dindex];
  62
  63       message->forward = (request->forward - 1) / 2;
  64       request->forward = request->forward / 2;
  65
  66       if (0 < request->forward) {
  67         request->dst =
  68           (request->dst + message->forward + 1) % request->comm->size;
  69         xbt_fifo_push(request_queue, request);
  70       } else {
  71         request->completed = 1;
  72       }
  73
  74       action =
  75         SIMIX_action_communicate(shost, dhost, "communication",
  76                                  request->datatype->size * request->count,
  77                                  -1.0);
  78
  79       SIMIX_register_action_to_condition(action, request->cond);
  80
  81       for (state = SIMIX_action_get_state(action);
  82            state == SURF_ACTION_READY ||
  83            state == SURF_ACTION_RUNNING;
  84            state = SIMIX_action_get_state(action)
  85         ) {
  86         SIMIX_cond_wait(request->cond, request->mutex);
  87       }
  88
  89       xbt_fifo_push(smpi_global->received_message_queues[dindex], message);
  90
  91       SIMIX_unregister_action_to_condition(action, request->cond);
  92       SIMIX_action_destroy(action);
  93
  94       SIMIX_mutex_unlock(request->mutex);
  95
  96       // wake up receiver if necessary
  97       receiver_process = smpi_global->receiver_processes[dindex];
  98       if (SIMIX_process_is_suspended(receiver_process)) {
  99         SIMIX_process_resume(receiver_process);
 100       }
 101
 102     }
 103
 104     SIMIX_mutex_lock(smpi_global->running_hosts_count_mutex);
 105     running_hosts_count = smpi_global->running_hosts_count;
 106     SIMIX_mutex_unlock(smpi_global->running_hosts_count_mutex);
 107
 108   } while (0 < running_hosts_count);
 109
 110   return 0;
 111 }