feat(dnn): add more msg for user

GitOrigin-RevId: 6c0e61e61001035603316676c32cbcb33fe0d28f

dnn/src/atlas/handle.cpp

@@ -24,7 +24,9 @@ HandleImpl::~HandleImpl() noexcept = default;
 
 template <typename Opr>
 std::unique_ptr<Opr> HandleImpl::create_operator() {
-    megdnn_throw("unsupported atlas opr");
+    megdnn_throw(
+            "unsupported atlas opr, try export RUNTIME_OVERRIDE_LOG_LEVEL=0 to get "
+            "more info");
     return nullptr;
 }
 

dnn/src/cuda/handle_create.cpp

@@ -236,7 +236,9 @@ MEGDNN_SPECIALIZE_CREATE_OPERATOR(MultiHeadAttnBackward);
 
 template <typename Opr>
 std::unique_ptr<Opr> HandleImpl::create_operator() {
-    megdnn_throw("unsupported cuda opr");
+    megdnn_throw(
+            "unsupported cuda opr, try export RUNTIME_OVERRIDE_LOG_LEVEL=0 to get more "
+            "info");
     return nullptr;
 }
 

dnn/src/rocm/handle.cpp

@@ -124,7 +124,9 @@ void HandleImpl::ConstScalars::init() {
 
 template <typename Opr>
 std::unique_ptr<Opr> HandleImpl::create_operator() {
-    megdnn_throw("unsupported rocm opr");
+    megdnn_throw(
+            "unsupported rocm opr, try export RUNTIME_OVERRIDE_LOG_LEVEL=0 to get more "
+            "info");
     return nullptr;
 }
 

src/opr/impl/internal/megdnn_opr_wrapper.cpp

@@ -302,6 +302,10 @@ void MegDNNOprHolder::mixin_init_output_comp_node(OperatorNodeBase& self) {
 
 void MegDNNOprHolder::mixin_on_output_comp_node_stream_changed(OperatorNodeBase& self) {
     SingleCNOperatorNode::mixin_on_output_comp_node_stream_changed(self);
+    //! some backend do not imp opr, show more opr info when before call create megdnn
+    //! opr failed
+    mgb_log_debug("try create opr: %s: %s", self.cname(), self.dyn_typeinfo()->name);
+
     create_megdnn_opr();
     mgb_assert(m_dnn_opr);
     m_dnn_opr->set_error_tracker(&self);