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         smpi_received_message_t message;
  24
  25         int dindex;
  26
  27         smx_process_t receiver_process;
  28
  29         self  = SIMIX_process_self();
  30         shost = SIMIX_host_self();
  31
  32         // make sure root is done before own initialization
  33         SIMIX_mutex_lock(smpi_global->start_stop_mutex);
  34         if (!smpi_global->root_ready) {
  35                 SIMIX_cond_wait(smpi_global->start_stop_cond, smpi_global->start_stop_mutex);
  36         }
  37         SIMIX_mutex_unlock(smpi_global->start_stop_mutex);
  38
  39         index = smpi_host_index();
  40
  41         request_queue       = smpi_global->pending_send_request_queues[index];
  42         request_queue_mutex = smpi_global->pending_send_request_queues_mutexes[index];
  43
  44         smpi_global->sender_processes[index] = self;
  45
  46         // wait for all nodes to signal initializatin complete
  47         SIMIX_mutex_lock(smpi_global->start_stop_mutex);
  48         smpi_global->ready_process_count++;
  49         if (smpi_global->ready_process_count < 3 * smpi_global->host_count) {
  50                 SIMIX_cond_wait(smpi_global->start_stop_cond, smpi_global->start_stop_mutex);
  51         } else {
  52                 SIMIX_cond_broadcast(smpi_global->start_stop_cond);
  53         }
  54         SIMIX_mutex_unlock(smpi_global->start_stop_mutex);
  55
  56         do {
  57
  58                 SIMIX_mutex_lock(request_queue_mutex);
  59                 request = xbt_fifo_shift(request_queue);
  60                 SIMIX_mutex_unlock(request_queue_mutex);
  61
  62                 if (NULL == request) {
  63                         SIMIX_process_suspend(self);
  64                 } else {
  65
  66                         message          = xbt_mallocator_get(smpi_global->message_mallocator);
  67
  68                         SIMIX_mutex_lock(request->mutex);
  69
  70                         message->comm    = request->comm;
  71                         message->src     = request->comm->index_to_rank_map[index];
  72                         message->tag     = request->tag;
  73                         message->data    = request->data;
  74                         message->buf     = xbt_malloc(request->datatype->size * request->count);
  75                         memcpy(message->buf, request->buf, request->datatype->size * request->count);
  76
  77                         dindex = request->comm->rank_to_index_map[request->dst];
  78                         dhost  = smpi_global->hosts[dindex];
  79
  80                         message->forward = (request->forward - 1) / 2;
  81                         request->forward = request->forward / 2;
  82
  83                         if (0 < request->forward) {
  84                                 request->dst = (request->dst + message->forward + 1) % request->comm->size;
  85                                 SIMIX_mutex_lock(request_queue_mutex);
  86                                 xbt_fifo_push(request_queue, request);
  87                                 SIMIX_mutex_unlock(request_queue_mutex);
  88                         } else {
  89                                 request->completed = 1;
  90                         }
  91
  92                         action = SIMIX_action_communicate(shost, dhost, "communication", request->datatype->size * request->count, -1.0);
  93
  94                         SIMIX_register_action_to_condition(action, request->cond);
  95                         SIMIX_cond_wait(request->cond, request->mutex);
  96
  97                         SIMIX_unregister_action_to_condition(action, request->cond);
  98                         SIMIX_action_destroy(action);
  99
 100                         SIMIX_mutex_unlock(request->mutex);
 101
 102                         SIMIX_mutex_lock(smpi_global->received_message_queues_mutexes[dindex]);
 103                         xbt_fifo_push(smpi_global->received_message_queues[dindex], message);
 104                         SIMIX_mutex_unlock(smpi_global->received_message_queues_mutexes[dindex]);
 105
 106                         // wake up receiver if necessary
 107                         receiver_process = smpi_global->receiver_processes[dindex];
 108                         if (SIMIX_process_is_suspended(receiver_process)) {
 109                                 SIMIX_process_resume(receiver_process);
 110                         }
 111
 112                 }
 113
 114                 SIMIX_mutex_lock(smpi_global->running_hosts_count_mutex);
 115                 running_hosts_count = smpi_global->running_hosts_count;
 116                 SIMIX_mutex_unlock(smpi_global->running_hosts_count_mutex);
 117
 118         } while (0 < running_hosts_count);
 119
 120         return 0;
 121 }