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         char communication[] = "communication";
  19         smx_action_t action;
  20
  21         smpi_received_message_t message;
  22
  23         int dindex;
  24
  25         smx_process_t receiver_process;
  26
  27         self  = SIMIX_process_self();
  28         shost = SIMIX_host_self();
  29
  30         // make sure root is done before own initialization
  31         SIMIX_mutex_lock(smpi_global->start_stop_mutex);
  32         if (!smpi_global->root_ready) {
  33                 SIMIX_cond_wait(smpi_global->start_stop_cond, smpi_global->start_stop_mutex);
  34         }
  35         SIMIX_mutex_unlock(smpi_global->start_stop_mutex);
  36
  37         index = smpi_host_index();
  38
  39         request_queue       = smpi_global->pending_send_request_queues[index];
  40         request_queue_mutex = smpi_global->pending_send_request_queues_mutexes[index];
  41
  42         smpi_global->sender_processes[index] = self;
  43
  44         // wait for all nodes to signal initializatin complete
  45         SIMIX_mutex_lock(smpi_global->start_stop_mutex);
  46         smpi_global->ready_process_count++;
  47         if (smpi_global->ready_process_count < 3 * smpi_global->host_count) {
  48                 SIMIX_cond_wait(smpi_global->start_stop_cond, smpi_global->start_stop_mutex);
  49         } else {
  50                 SIMIX_cond_broadcast(smpi_global->start_stop_cond);
  51         }
  52         SIMIX_mutex_unlock(smpi_global->start_stop_mutex);
  53
  54         do {
  55
  56                 SIMIX_mutex_lock(request_queue_mutex);
  57                 request = xbt_fifo_shift(request_queue);
  58                 SIMIX_mutex_unlock(request_queue_mutex);
  59
  60                 if (NULL == request) {
  61                         SIMIX_process_suspend(self);
  62                 } else {
  63
  64                         message          = xbt_mallocator_get(smpi_global->message_mallocator);
  65
  66                         SIMIX_mutex_lock(request->mutex);
  67
  68                         message->comm    = request->comm;
  69                         message->src     = smpi_mpi_comm_rank(request->comm);
  70                         message->tag     = request->tag;
  71                         message->data    = request->data;
  72                         message->buf     = xbt_malloc(request->datatype->size * request->count);
  73                         memcpy(message->buf, request->buf, request->datatype->size * request->count);
  74
  75                         dindex = request->comm->rank_to_index_map[request->dst];
  76                         dhost  = smpi_global->hosts[dindex];
  77
  78                         message->forward = (request->forward - 1) / 2;
  79                         request->forward = request->forward / 2;
  80
  81                         SIMIX_mutex_lock(smpi_global->received_message_queues_mutexes[dindex]);
  82                         xbt_fifo_push(smpi_global->received_message_queues[dindex], message);
  83                         SIMIX_mutex_unlock(smpi_global->received_message_queues_mutexes[dindex]);
  84
  85                         if (0 < request->forward) {
  86                                 request->dst = (request->dst + message->forward + 1) % request->comm->size;
  87                                 SIMIX_mutex_lock(request_queue_mutex);
  88                                 xbt_fifo_push(request_queue, request);
  89                                 SIMIX_mutex_unlock(request_queue_mutex);
  90                         } else {
  91                                 request->completed = 1;
  92                         }
  93
  94                         action = SIMIX_action_communicate(shost, dhost, communication, request->datatype->size * request->count, -1.0);
  95
  96                         SIMIX_register_action_to_condition(action, request->cond);
  97                         SIMIX_cond_wait(request->cond, request->mutex);
  98                         SIMIX_unregister_action_to_condition(action, request->cond);
  99
 100                         SIMIX_mutex_unlock(request->mutex);
 101
 102                         // wake up receiver if necessary
 103                         receiver_process = smpi_global->receiver_processes[dindex];
 104                         if (SIMIX_process_is_suspended(receiver_process)) {
 105                                 SIMIX_process_resume(receiver_process);
 106                         }
 107
 108                 }
 109
 110                 SIMIX_mutex_lock(smpi_global->running_hosts_count_mutex);
 111                 running_hosts_count = smpi_global->running_hosts_count;
 112                 SIMIX_mutex_unlock(smpi_global->running_hosts_count_mutex);
 113
 114         } while (0 < running_hosts_count);
 115
 116         return 0;
 117 }