return request;
}
+static void smpi_mpi_request_free_voidp(void* request)
+{
+ smpi_mpi_request_free(request);
+}
+
/* MPI Low level calls */
MPI_Request smpi_mpi_send_init(void *buf, int count, MPI_Datatype datatype,
int dst, int tag, MPI_Comm comm)
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");
if(request->flags & RECV) {
print_request("New recv", request);
mailbox = smpi_process_mailbox();
- // FIXME: SIMIX does not yet support don-contiguous datatypes
+ // FIXME: SIMIX does not yet support non-contiguous datatypes
request->action = SIMIX_req_comm_irecv(mailbox, request->buf, &request->size, &match_recv, request);
} else {
print_request("New send", request);
mailbox = smpi_process_remote_mailbox(
- smpi_group_index(smpi_comm_group(request->comm), request->dst));
- // FIXME: SIMIX does not yet support don-contiguous datatypes
- request->action = SIMIX_req_comm_isend(mailbox, request->size, -1.0,
- request->buf, request->size, &match_send, request, 0);
+ 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,
+ &smpi_mpi_request_free_voidp, // how to free the userdata if a detached send fails
+ request,
+ // detach if msg size < eager/rdv switch limit
+ detached);
+
#ifdef HAVE_TRACING
SIMIX_req_set_category (request->action, TRACE_internal_smpi_get_category());
#endif
void smpi_mpi_startall(int count, MPI_Request * requests)
{
- int i;
+ int i;
for(i = 0; i < count; i++) {
smpi_mpi_start(requests[i]);
}
}
-int smpi_mpi_test(MPI_Request * request, MPI_Status * status)
-{
- int flag = SIMIX_req_comm_test((*request)->action);
+int smpi_mpi_test(MPI_Request * request, MPI_Status * status) {
+int flag;
+ if ((*request)->action == NULL)
+ flag = 1;
+ else
+ flag = SIMIX_req_comm_test((*request)->action);
if(flag) {
- smpi_mpi_wait(request, status);
- }
- return flag;
+ smpi_mpi_wait(request, status);
+ }
+ return flag;
}
int smpi_mpi_testany(int count, MPI_Request requests[], int *index,
void smpi_mpi_wait(MPI_Request * request, MPI_Status * status)
{
print_request("Waiting", *request);
- SIMIX_req_comm_wait((*request)->action, -1.0);
- finish_wait(request, status);
+ if ((*request)->action != NULL) { // this is not a detached send
+ SIMIX_req_comm_wait((*request)->action, -1.0);
+ finish_wait(request, status);
+ }
+ // FIXME for a detached send, finish_wait is not called:
}
int smpi_mpi_waitany(int count, MPI_Request requests[],
size = 0;
XBT_DEBUG("Wait for one of");
for(i = 0; i < count; i++) {
- if(requests[i] != MPI_REQUEST_NULL) {
+ if((requests[i] != MPI_REQUEST_NULL) && (requests[i]->action != NULL)) {
print_request(" ", requests[i]);
xbt_dynar_push(comms, &requests[i]->action);
map[size] = i;