Merge pull request open-mpi#7503 from artpol84/fix/ucx_error_out

pml/ucx: Warn if UCX is built in a single-threaded mode

Author: gpaulsen

ompi/mca/pml/ucx/pml_ucx.c

@@ -319,8 +319,8 @@ int mca_pml_ucx_init(int enable_mpi_threads)
     if (enable_mpi_threads && (attr.thread_mode != UCS_THREAD_MODE_MULTI)) {
         /* UCX does not support multithreading, disqualify current PML for now */
         /* TODO: we should let OMPI to fallback to THREAD_SINGLE mode */
-        PML_UCX_VERBOSE(1, "UCP worker does not support MPI_THREAD_MULTIPLE. "
-                           "PML UCX could not be selected");
+        PML_UCX_WARN("UCP worker does not support MPI_THREAD_MULTIPLE. "
+                     "PML UCX could not be selected");
         rc = OMPI_ERR_NOT_SUPPORTED;
         goto err_destroy_worker;
     }

ompi/mca/pml/ucx/pml_ucx.h

@@ -26,7 +26,7 @@
 #define PML_UCX_ASSERT  MCA_COMMON_UCX_ASSERT
 #define PML_UCX_ERROR   MCA_COMMON_UCX_ERROR
 #define PML_UCX_VERBOSE MCA_COMMON_UCX_VERBOSE
-
+#define PML_UCX_WARN    MCA_COMMON_UCX_WARN
 
 typedef struct mca_pml_ucx_module           mca_pml_ucx_module_t;
 typedef struct pml_ucx_persistent_request   mca_pml_ucx_persistent_request_t;