[DRAFT] Capacity aware partitioning

include/onnxruntime/core/framework/execution_provider.h

@@ -38,6 +38,8 @@ struct OrtRunOptions;
 
 namespace onnxruntime {
 
+class IResourceAccountant;
+
 /**
    Logical device representation.
 */
@@ -130,7 +132,8 @@ class IExecutionProvider {
   */
   virtual std::vector<std::unique_ptr<ComputeCapability>>
   GetCapability(const onnxruntime::GraphViewer& graph_viewer,
-                const IKernelLookup& kernel_lookup) const;
+                const IKernelLookup& kernel_lookup,
+                IResourceAccountant* resource_accountant = nullptr) const;
 
   /**
      Get kernel registry per execution provider type.

include/onnxruntime/core/framework/resource_accountant.h

@@ -0,0 +1,48 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+#pragma once
+
+#include <optional>
+#include <variant>
+
+namespace onnxruntime {
+#ifndef SHARED_PROVIDER
+class Graph;
+#else
+struct Graph;
+#endif
+
+// Common holder for potentially different resource accounting
+// for different EPs
+using ResourceCount = std::variant<size_t>;
+
+/// <summary>
+/// This class is used for graph partitioning by EPs
+/// It stores the cumulative amount of the resource such as
+/// memory that would be consumed by the graph nodes if it is assigned to the EP.
+///
+/// It provides interfaces to add, remove and query the resource consumption.
+///
+/// Each provider may assign its own meaning to the resource according to its constraints.
+/// </summary>
+class IResourceAccountant {
+ protected:
+  IResourceAccountant() = default;
+  IResourceAccountant(const ResourceCount& threshold) : threshold_(threshold) {}
+
+ public:
+  virtual ~IResourceAccountant() = default;
+  virtual ResourceCount GetConsumedAmount() const = 0;
+  virtual void AddConsumedAmount(const ResourceCount& amount) = 0;
+  virtual void RemoveConsumedAmount(const ResourceCount& amount) = 0;
+  virtual ResourceCount ComputeResourceCount(const Graph&, size_t node_index) const = 0;
+  std::optional<ResourceCount> GetThreshold() const {
+    return threshold_;
+  }
+
+ private:
+  std::optional<ResourceCount> threshold_;
+};
+
+}  // namespace onnxruntime

include/onnxruntime/core/graph/graph.h

@@ -880,6 +880,13 @@ class Graph {  // NOLINT(clang-analyzer-optin.performance.Padding): preserve exi
     return ConstGraphNodes(nodes_, std::move(filter_func));
   }
 
+  /** Compute node memory requirements, which is mostly initializers
+      and large attributes that are copied on device (special cases for some nodes)
+
+      Returns no value if the node was not found.
+  */
+  size_t ComputeNodeMemoryUsage(NodeIndex) const;
+
   /** Gets the maximum NodeIndex value used in the Graph.
   WARNING: This actually returns the max index value used + 1.
   */

include/onnxruntime/core/graph/indexed_sub_graph.h

@@ -7,6 +7,8 @@
 #include <string>
 #include <vector>
 
+#include "core/common/inlined_containers_fwd.h"
+#include "core/framework/resource_accountant.h"
 #include "core/graph/basic_types.h"
 #include "core/graph/onnx_protobuf.h"
 
@@ -70,9 +72,56 @@ struct IndexedSubGraph {
     return meta_def_.get();
   }
 
+  // Check if the accounting is enabled for the current EP
+  bool IsAccountingEnabled() const {
+    return resource_accountant != nullptr &&
+           nodes_costs.size() == nodes.size();
+  }
+
+  // Should call IsAccountingEnabled() first
+  // Takes the previously computed ResourceCount for the node
+  // (usually during GetCapabiilty())
+  // if present and adds it to the consumed amount
+  void AccountForNode(size_t cost_index) const {
+    assert(cost_index < nodes_costs.size());
+    if (nodes_costs[cost_index].has_value()) {
+      resource_accountant->AddConsumedAmount(*nodes_costs[cost_index]);
+    }
+  }
+
+  // This computes and accounts for the resource cost for the node that just
+  // been fused from other nodes, and the EP did not had a chance to compute the costs.
+  void ComputeAndAccountForNode(const Graph& graph, size_t node_index) const {
+    assert(resource_accountant != nullptr);
+    resource_accountant->AddConsumedAmount(resource_accountant->ComputeResourceCount(graph, node_index));
+  }
+
+  void SetAccountant(IResourceAccountant* res_accountant) {
+    resource_accountant = res_accountant;
+  }
+
+  // Append resource count to the list of costs for the nodes.
+  void AppendNodeCost(const ResourceCount& cost) {
+    assert(resource_accountant != nullptr);
+    nodes_costs.emplace_back(cost);
+  }
+
+  // Append an absent cost for the node that was already accounted for.
+  void AppendNodeEmptyCost() {
+    assert(resource_accountant != nullptr);
+    nodes_costs.emplace_back();
+  }
+
  private:
   // subgraph meta definition.
   std::unique_ptr<MetaDef> meta_def_;
+  // Optional resource accountant for this subgraph.
+  IResourceAccountant* resource_accountant = nullptr;
+  // Vector with resource costs for nodes above. Should have the same size
+  // Some nodes that were previously accounted for because they already been assigned to an EP
+  // for example during multiple calls to GetCapabiility() will not have resource count present.
+  // may not have a resource count present, we skip it.
+  InlinedVector<std::optional<ResourceCount>> nodes_costs;
 };
 
 }  // namespace onnxruntime

include/onnxruntime/core/session/onnxruntime_session_options_config_keys.h

@@ -197,6 +197,11 @@
 // The file saves configuration for partitioning node among logic streams
 static const char* const kNodePartitionConfigFile = "session.node_partition_config_file";
 
+/// "number > 0": enables Capacity Aware Partitioning for Cuda EP. The EP will place nodes on device
+/// "0" : disables Capacity Aware Partitioning for Cuda EP. The EP will place nodes on device based on the default policy.
+///  until the device memory usage reaches the specified threshold in Kb. The default value is 0.
+static const char* const kOrtSessionOptionsConfigPartitionSetCudaMemoryLimitKb = "session.node_partition_memory_limit_kb";
+
 // This Option allows setting affinities for intra op threads.
 // Affinity string follows format:
 // logical_processor_id,logical_processor_id;logical_processor_id,logical_processor_id

onnxruntime/core/framework/execution_provider.cc

@@ -13,7 +13,8 @@
 
 std::vector<std::unique_ptr<ComputeCapability>>
 IExecutionProvider::GetCapability(const onnxruntime::GraphViewer& graph,
-                                  const IKernelLookup& kernel_lookup) const {
+                                  const IKernelLookup& kernel_lookup,
+                                  IResourceAccountant*) const {
   std::vector<std::unique_ptr<ComputeCapability>> result;
   for (const auto& node : graph.Nodes()) {
     if (const KernelCreateInfo* kernel_create_info = kernel_lookup.LookUpKernel(node);