src/smpi/smpi_receiver.c

   1 #include "private.h"
   2
   3 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(smpi_receiver, smpi,
   4                                 "Logging specific to SMPI (receiver)");
   5
   6 int smpi_receiver(int argc, char *argv[])
   7 {
   8   smpi_process_data_t mydata = SIMIX_process_get_data(SIMIX_process_self());
   9   smx_process_t self;
  10   int index = mydata->index;
  11
  12   xbt_fifo_t request_queue;
  13   xbt_fifo_t message_queue;
  14
  15   smpi_mpi_request_t request;
  16   smpi_received_message_t message;
  17
  18   xbt_fifo_item_t request_item;
  19   xbt_fifo_item_t message_item;
  20
  21   self = SIMIX_process_self();
  22
  23   request_queue = mydata->pending_recv_request_queue;
  24   message_queue = mydata->received_message_queue;
  25
  26   DEBUG0("Up and running");
  27
  28
  29   while (1) {
  30     // FIXME: better algorithm, maybe some kind of balanced tree? or a heap?
  31
  32     DEBUG0("Look for matching");
  33     xbt_fifo_foreach(request_queue, request_item, request, smpi_mpi_request_t) {
  34       xbt_fifo_foreach(message_queue, message_item, message,
  35                        smpi_received_message_t) {
  36
  37 //#define DEBUG_MATCH
  38 #ifdef DEBUG_MATCH
  39         printf("[%s] try match (req_src=%d,msg_src=%d)x(req_tag=%d,msg_tag=%d)\n",
  40                         __FILE__,request->src,message->src,request->tag, message->tag);
  41 #endif
  42         if (request->comm == message->comm &&
  43                         (MPI_ANY_SOURCE == request->src || request->src == message->src)
  44                         && (MPI_ANY_TAG == request->tag || request->tag == message->tag)) {
  45                 xbt_fifo_remove_item(request_queue, request_item);
  46                 xbt_fifo_free_item(request_item);
  47                 xbt_fifo_remove_item(message_queue, message_item);
  48                 xbt_fifo_free_item(message_item);
  49                 DEBUG5("found matching request %p: (req_src=%d,msg_src=%d)x(req_tag=%d,msg_tag=%d)",
  50                                 request,request->src,message->src,request->tag, message->tag);
  51                 goto stopsearch;
  52         } else {
  53                 DEBUG5("fail to match request %p: (req_src=%d,msg_src=%d)x(req_tag=%d,msg_tag=%d)",
  54                                 request,request->src,message->src,request->tag, message->tag);
  55         }
  56       }
  57     }
  58
  59     request = NULL;
  60     message = NULL;
  61
  62   stopsearch:
  63     if (NULL != request) {
  64       if (NULL == message)
  65         DIE_IMPOSSIBLE;
  66
  67       SIMIX_mutex_lock(request->mutex);
  68       memcpy(request->buf, message->buf,
  69              request->datatype->size * request->count);
  70       request->src = message->src;
  71       request->data = message->data;
  72       request->forward = message->forward;
  73
  74       if (0 == request->forward) {
  75         request->completed = 1;
  76         SIMIX_cond_broadcast(request->cond);
  77       } else {
  78         request->src = request->comm->index_to_rank_map[index];
  79         request->dst = (request->src + 1) % request->comm->size;
  80         smpi_mpi_isend(request);
  81       }
  82
  83       SIMIX_mutex_unlock(request->mutex);
  84
  85       xbt_free(message->buf);
  86       xbt_mallocator_release(smpi_global->message_mallocator, message);
  87
  88     } else if (mydata->finalize > 0) {  /* main wants me to die and nothing to do */
  89       // FIXME: display the list of remaining requests and messages (user code synchronization faulty?)
  90       DEBUG0("Main wants me to die and I'm done. Bye, guys.");
  91       mydata->finalize--;
  92       SIMIX_cond_signal(mydata->cond);
  93       return 0;
  94     } else {
  95       DEBUG0("Nothing to do. Let's get a nap");
  96       SIMIX_process_suspend(self);
  97       DEBUG0("=== Uh? Someone called me? ===");
  98     }
  99   }
 100
 101   return 0;
 102 }