[DeepRec] Support user setup cpusets for each session_group.

Author: liutongxuan

tensorflow_serving/example/config_files/session_group_multi_models_platform_config

@@ -15,6 +15,7 @@ platform_configs {
               use_per_session_stream: true
             }
             session_num: 2
+            cpusets: "1,2;5,6"
           }
           model_session_config {
             session_config {
@@ -27,6 +28,7 @@ platform_configs {
               use_per_session_stream: true
             }
             session_num: 4
+            cpusets: "20,21;23,24;26,27;29,30"
           }
         }
       }

tensorflow_serving/servables/tensorflow/bundle_factory_util.cc

@@ -96,6 +96,8 @@ SessionGroupOptions GetSessionOptions(const SessionGroupBundleConfig& config, in
     options.metadata.streams_vec.emplace_back(conf.session_num());
   }
   options.metadata.model_id = model_id;
+  options.metadata.cpusets = config.model_session_config()[model_id].cpusets();
+ 
   return options;
 }
 

tensorflow_serving/servables/tensorflow/session_bundle_config.proto

@@ -170,11 +170,13 @@ message SessionGroupBundleConfig {
     // See details at tensorflow/core/protobuf/config.proto.
     ConfigProto session_config = 1;
     // session_num of the session group.
-    int32 session_num = 2;// [default = 1];
+    int32 session_num = 2;
     // gpu num
     //int32 gpu_num = 3;
     // model id in multi-models
     int32 model_id = 3;
+    // cpusets
+    string cpusets = 4;
   }
 
   repeated ModelSessionConfig model_session_config = 784;