more verbose debug around detached sends

[simgrid.git] / src / smpi / smpi_base.c

diff --git a/src/smpi/smpi_base.c b/src/smpi/smpi_base.c
index fc093b5..0fc8226 100644 (file)
--- a/src/smpi/smpi_base.c
+++ b/src/smpi/smpi_base.c
@@ -87,6 +87,7 @@ MPI_Request smpi_mpi_recv_init(void *buf, int count, MPI_Datatype datatype,
 void smpi_mpi_start(MPI_Request request)
 {
   smx_rdv_t mailbox;
+  int detached = 0;
 
   xbt_assert(!request->action,
               "Cannot (re)start a non-finished communication");
@@ -101,12 +102,21 @@ void smpi_mpi_start(MPI_Request request)
                          smpi_group_index(smpi_comm_group(request->comm), request->dst));
     // FIXME: SIMIX does not yet support non-contiguous datatypes
 
+    if (request->size < 64*1024 ) { // eager mode => detached send (FIXME: this limit should be configurable)
+       void *oldbuf = request->buf;
+       detached = 1;
+       request->buf = malloc(request->size);
+       memcpy(request->buf,oldbuf,request->size);
+       XBT_DEBUG("Send request %p is detached; buf %p copied into %p",request,oldbuf,request->buf);
+    } else {
+       XBT_DEBUG("Send request %p is not detached (buf: %p)",request,request->buf);
+    }
     request->action = 
                SIMIX_req_comm_isend(mailbox, request->size, -1.0,
                                    request->buf, request->size, &match_send, request,  
                                    // detach if msg size < eager/rdv switch limit
-                                   request->size < 64*1024 ? 1:0);
-    // if detached  request->action == NULL
+                                   detached);
+
 #ifdef HAVE_TRACING
     SIMIX_req_set_category (request->action, TRACE_internal_smpi_get_category());
 #endif