src/smpi/smpi_sender.c

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