cuda: add option to remove warning about missing libcuda.

Signed-off-by: Sylvain Jeaugey <sjeaugey@nvidia.com>

opal/mca/common/cuda/common_cuda.c

@@ -429,8 +429,10 @@ int mca_common_cuda_stage_one_init(void)
 
     if (true != stage_one_init_passed) {
         errmsg = opal_argv_join(errmsgs, '\n');
-        opal_show_help("help-mpi-common-cuda.txt", "dlopen failed", true,
-                       errmsg);
+        if (opal_warn_on_missing_libcuda) {
+            opal_show_help("help-mpi-common-cuda.txt", "dlopen failed", true,
+                           errmsg);
+        }
         opal_cuda_support = 0;
     }
     opal_argv_free(errmsgs);

opal/mca/common/cuda/help-mpi-common-cuda.txt

@@ -166,7 +166,7 @@ The library attempted to open the following supporting CUDA libraries,
 but each of them failed.  CUDA-aware support is disabled.
 %s
 If you are not interested in CUDA-aware support, then run with
---mca mpi_cuda_support 0 to suppress this message.  If you are interested
+--mca opal_warn_on_missing_libcuda 0 to suppress this message.  If you are interested
 in CUDA-aware support, then try setting LD_LIBRARY_PATH to the location
 of libcuda.so.1 to get passed this issue.
 #

opal/runtime/opal_params.c

@@ -61,6 +61,7 @@ bool opal_timing_overhead = true;
 
 bool opal_built_with_cuda_support = OPAL_INT_TO_BOOL(OPAL_CUDA_SUPPORT);
 bool opal_cuda_support = false;
+bool opal_warn_on_missing_libcuda = true;
 #if OPAL_ENABLE_FT_CR == 1
 bool opal_base_distill_checkpoint_ready = false;
 #endif
@@ -245,6 +246,16 @@ int opal_register_params(void)
         return ret;
     }
 
+    opal_warn_on_missing_libcuda = true;
+    ret = mca_base_var_register ("opal", "opal", NULL, "warn_on_missing_libcuda",
+                                 "Whether to print a message when CUDA support is enabled but libcuda is not found",
+                                 MCA_BASE_VAR_TYPE_BOOL, NULL, 0, MCA_BASE_VAR_FLAG_SETTABLE,
+                                 OPAL_INFO_LVL_3, MCA_BASE_VAR_SCOPE_ALL_EQ,
+                                 &opal_warn_on_missing_libcuda);
+    if (0 > ret) {
+        return ret;
+    }
+
     /* Leave pinned parameter */
     opal_leave_pinned = -1;
     ret = mca_base_var_register("ompi", "mpi", NULL, "leave_pinned",

opal/runtime/opal_params.h

@@ -48,6 +48,11 @@ OPAL_DECLSPEC extern bool opal_built_with_cuda_support;
  *   */
 OPAL_DECLSPEC extern bool opal_cuda_support;
 
+/**
+ *  * Whether we want to warn the user when libcuda is missing.
+ *   */
+OPAL_DECLSPEC extern bool opal_warn_on_missing_libcuda;
+
 /**
  * Whether to use the "leave pinned" protocol or not (0 = no, 1 = yes,
  * -1 = determine at runtime).