communicator bugfix: disjoint function does not have the correct max_local_peers value

local_peers is passed in the non-blocking function iallreduce_fn as a stack variable.
Change it to be part of the context struct so the correct value is passed.

Signed-off-by: Jessie Yang <[email protected]>

Author: jiaxiyan

ompi/communicator/comm_cid.c

@@ -99,6 +99,7 @@ struct ompi_comm_cid_context_t {
     int iter;
     /** storage for activate barrier */
     int max_local_peers;
+    int local_peers;
     char *port_string;
     bool send_first;
     int pml_tag;
@@ -267,6 +268,7 @@ static ompi_comm_cid_context_t *mca_comm_cid_context_alloc (ompi_communicator_t
     context->send_first = send_first;
     context->iter = 0;
     context->max_local_peers = ompi_group_count_local_peers(newcomm->c_local_group);
+    context->local_peers = context->max_local_peers;
 
     return context;
 }
@@ -870,7 +872,7 @@ int ompi_comm_activate_nb (ompi_communicator_t **newcomm, ompi_communicator_t *c
     ompi_comm_cid_context_t *context;
     ompi_comm_request_t *request;
     ompi_request_t *subreq;
-    int ret = 0, local_peers = -1;
+    int ret = 0;
 
     /* the caller should not pass NULL for comm (it may be the same as *newcomm) */
     assert (NULL != comm);
@@ -907,9 +909,8 @@ int ompi_comm_activate_nb (ompi_communicator_t **newcomm, ompi_communicator_t *c
      * 1. The communicator's disjointness is inferred from max_local_peers.
      * 2. After the operation it is allowed to send messages over the new communicator.
      */
-    local_peers = context->max_local_peers;
-    ret = context->iallreduce_fn (&local_peers, &context->max_local_peers, 1, MPI_MAX, context,
-                                 &subreq);
+    ret = context->iallreduce_fn (&context->local_peers, &context->max_local_peers, 1, MPI_MAX, context,
+                                  &subreq);
     if (OMPI_SUCCESS != ret) {
         ompi_comm_request_return (request);
         return ret;