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 #ifdef DEBUG_MATCH
  50         printf("[%s] found match: req_src=%d,msg_src=%d)x(req_tag=%d,msg_tag=%d)\n",
  51                         __FILE__,request->src,message->src,request->tag, message->tag);
  52 #endif
  53        DEBUG4("found match: (req_src=%d,msg_src=%d)x(req_tag=%d,msg_tag=%d)",
  54                         request->src,message->src,request->tag, message->tag);
  55           goto stopsearch;
  56         } else {
  57           DEBUG4("Matching fails: (req_src=%d,msg_src=%d)x(req_tag=%d,msg_tag=%d)",
  58                         request->src,message->src,request->tag, message->tag);
  59         }
  60       }
  61     }
  62
  63     request = NULL;
  64     message = NULL;
  65
  66   stopsearch:
  67     if (NULL != request) {
  68       if (NULL == message)
  69         DIE_IMPOSSIBLE;
  70
  71       SIMIX_mutex_lock(request->mutex);
  72       memcpy(request->buf, message->buf,
  73              request->datatype->size * request->count);
  74       request->src = message->src;
  75       request->data = message->data;
  76       request->forward = message->forward;
  77
  78       if (0 == request->forward) {
  79         request->completed = 1;
  80         SIMIX_cond_broadcast(request->cond);
  81       } else {
  82         request->src = request->comm->index_to_rank_map[index];
  83         request->dst = (request->src + 1) % request->comm->size;
  84         smpi_mpi_isend(request);
  85       }
  86
  87       SIMIX_mutex_unlock(request->mutex);
  88
  89       xbt_free(message->buf);
  90       xbt_mallocator_release(smpi_global->message_mallocator, message);
  91
  92     } else if (mydata->finalize > 0) {  /* main wants me to die and nothing to do */
  93       // FIXME: display the list of remaining requests and messages (user code synchronization faulty?)
  94       DEBUG0("Main wants me to die and I'm done. Bye, guys.");
  95       mydata->finalize--;
  96       SIMIX_cond_signal(mydata->cond);
  97       return 0;
  98     } else {
  99       DEBUG0("Nothing to do. Let's get a nap");
 100       SIMIX_process_suspend(self);
 101       DEBUG0("Uh? Someone called me?");
 102     }
 103   }
 104
 105   return 0;
 106 }