add GenParentScopeTreeDebugInfo

paddle/fluid/framework/parallel_executor.cc

@@ -365,6 +365,7 @@ ParallelExecutor::ParallelExecutor(
 
 void ParallelExecutor::BCastParamsToDevices(
     const std::unordered_set<std::string> &vars) const {
+  VLOG(3) << "BCastParamsToDevices";
   // the initializing bcast, all vars would be bcast from device(0).
   for (auto &var : vars) {
     framework::Variable *main_var = member_->local_scopes_[0]->FindVar(var);

paddle/fluid/framework/scope.cc

@@ -259,5 +259,34 @@ std::string GenScopeTreeDebugInfo(Scope* root) {
   return os.str();
 }
 
+std::string GenParentScopeTreeDebugInfo(Scope* leaf) {
+  std::stringstream os;
+
+  if (!leaf) return "";
+
+  // level traversal
+  std::vector<const Scope*> scopes;
+  const Scope* current_scope = leaf;
+
+  while (current_scope != nullptr) {
+    scopes.push_back(current_scope);
+    current_scope = current_scope->parent();
+    // end of a level
+    os << "\n------------------------------------------\n";
+  }
+
+  os << "\nDetails:\n\n";
+
+  for (auto* q : scopes) {
+    os << "====\n";
+    os << q << ":\n";
+    for (auto& var : q->LocalVarNames()) {
+      os << "  - " << var << "\n";
+    }
+  }
+
+  return os.str();
+}
+
 }  // namespace framework
 }  // namespace paddle

paddle/fluid/framework/scope.h

@@ -144,6 +144,7 @@ class Scope {
 // Generate some debug string about the inherience structure of scope, quite
 // naive.
 std::string GenScopeTreeDebugInfo(Scope*);
+std::string GenParentScopeTreeDebugInfo(Scope*);
 
 }  // namespace framework
 }  // namespace paddle