diff --git a/paddle/fluid/distributed/ps.proto b/paddle/fluid/distributed/ps.proto
index 8299fd32ee4800e4b12fc59d68b5c419b2dd121c..5d4ab954bbdaec0b18192802787e272ecf2e6b24 100644
--- a/paddle/fluid/distributed/ps.proto
+++ b/paddle/fluid/distributed/ps.proto
@@ -15,244 +15,251 @@
 syntax = "proto2";
 package paddle;
 option cc_generic_services = true;
-option cc_enable_arenas = true;
-
-enum TableType {
-  PS_SPARSE_TABLE = 0;
-  PS_DENSE_TABLE = 1;
-}
-
-enum PsCmdID {
-  PS_PULL_DENSE_TABLE = 0;
-  PS_PUSH_DENSE_TABLE = 1;
-  PS_PULL_SPARSE_TABLE = 2;
-  PS_PUSH_SPARSE_TABLE = 3;
-  PS_SHRINK_TABLE = 4;
-  PS_SAVE_ONE_TABLE = 5;
-  PS_SAVE_ALL_TABLE = 6;
-  PS_LOAD_ONE_TABLE = 7;
-  PS_LOAD_ALL_TABLE = 8;
-  PS_CLEAR_ONE_TABLE = 9;
-  PS_CLEAR_ALL_TABLE = 10;
-  PS_PUSH_DENSE_PARAM = 11;
-  PS_STOP_SERVER = 12;
-  PS_SAVE_ONE_CACHE_TABLE = 13;
-  PS_GET_CACHE_THRESHOLD = 14;
-  PS_CACHE_SHUFFLE = 15;
-  PS_COPY_TABLE = 16;
-  PS_COPY_TABLE_BY_FEASIGN = 17;
-  PS_PULL_SPARSE_TABLE_WITH_DEPENDENCY = 18;
-  PS_PUSH_SPARSE_TABLE_WITH_DEPENDENCY = 19;
-  PS_PRINT_TABLE_STAT = 20;
-  PS_S2S_MSG = 101;
-}
+option cc_enable_arenas=true;
 
 message PSParameter {
-  optional string worker_class = 1;
-  optional string server_class = 2;
-  optional string instance_class = 3;
-  optional string init_gflags = 4;
-  optional WorkerParameter worker_param = 101;
-  optional ServerParameter server_param = 102;
-  repeated DownpourTrainerParameter trainer_param = 301;
-  optional FsClientParameter fs_client_param = 501;
+    optional string worker_class = 1;
+    optional string server_class = 2;
+    optional string instance_class = 3;
+    optional string init_gflags = 4 [ default = "" ];
+    optional WorkerParameter worker_param = 101;
+    optional ServerParameter server_param = 102;
+    repeated DownpourTrainerParameter trainer_param = 301;
+    optional FsClientParameter fs_client_param = 501;
 }
 
 message WorkerParameter {
-  optional DownpourWorkerParameter downpour_worker_param = 1;
+    optional DownpourWorkerParameter downpour_worker_param = 1;
 }
 
 message ServerParameter {
-  optional DownpourServerParameter downpour_server_param = 1;
+    optional DownpourServerParameter downpour_server_param = 1;
 }
 
 message DownpourWorkerParameter {
-  repeated TableParameter downpour_table_param = 1;
+    repeated TableParameter downpour_table_param = 1;
 }
 
 message DownpourTrainerParameter {
-  repeated DenseTableParameter dense_table = 1;
-  repeated SparseTableParameter sparse_table = 2;
-  optional int32 push_sparse_per_batch = 3;
-  optional int32 push_dense_per_batch = 4;
-  repeated string skip_op = 5;
-  repeated ProgramConfig program_config = 6;
+    repeated DenseTableParameter dense_table = 1;
+    repeated SparseTableParameter sparse_table = 2;
+    optional int32 push_sparse_per_batch = 3;
+    optional int32 push_dense_per_batch = 4;
+    repeated string skip_op = 5;
+    repeated ProgramConfig program_config = 6;
 }
 
 message ProgramConfig {
-  required string program_id = 1;
-  repeated int32 push_sparse_table_id = 2;
-  repeated int32 push_dense_table_id = 3;
-  repeated int32 pull_sparse_table_id = 4;
-  repeated int32 pull_dense_table_id = 5;
+    required string program_id = 1;
+    repeated int32 push_sparse_table_id = 2;
+    repeated int32 push_dense_table_id = 3;
+    repeated int32 pull_sparse_table_id = 4;
+    repeated int32 pull_dense_table_id = 5;
 }
 
 message DenseTableParameter {
-  optional int32 table_id = 1;
-  repeated string dense_variable_name = 2;
-  repeated string dense_gradient_variable_name = 3;
-  optional int32 fea_dim = 4;
+    optional int32 table_id = 1;
+    repeated string dense_variable_name = 2;
+    repeated string dense_gradient_variable_name = 3;
+    optional int32 fea_dim = 4;
 }
 
 message SparseTableParameter {
-  optional int32 table_id = 1;
-  optional int32 feature_dim = 2;
-  repeated string slot_key = 3;
-  repeated string slot_value = 4;
-  repeated string slot_gradient = 5;
+    optional int32 table_id = 1;
+    optional int32 feature_dim = 2;
+    repeated string slot_key = 3;
+    repeated string slot_value = 4;
+    repeated string slot_gradient = 5;
 }
 
 message DownpourServerParameter {
-  repeated TableParameter downpour_table_param = 1;
-  optional ServerServiceParameter service_param = 2;
+    repeated TableParameter downpour_table_param = 1;
+    optional ServerServiceParameter service_param = 2;
 }
 
 message ServerServiceParameter {
-  optional string server_class = 1 [ default = "DownpourBrpcPsServer" ];
-  optional string client_class = 2 [ default = "DownpourBrpcPsClient" ];
-  optional string service_class = 3 [ default = "DownpourPsService" ];
-  optional uint32 start_server_port = 4 [ default = 0 ];
-  optional uint32 server_thread_num = 5 [ default = 12 ];
+    optional string server_class      = 1 [ default = "DownpourBrpcPsServer" ];
+    optional string client_class      = 2 [ default = "DownpourBrpcPsClient" ];
+    optional string service_class     = 3 [ default = "DownpourPsService"];
+    optional uint32 start_server_port = 4 [ default = 0 ];  //will find a avaliable port from it
+    optional uint32 server_thread_num = 5 [ default = 12 ];
+}
+
+enum TableType {
+    PS_SPARSE_TABLE = 0;
+    PS_DENSE_TABLE = 1;
 }
 
 message TableParameter {
-  optional uint64 table_id = 1;
-  optional string table_class = 2;
-  optional uint64 shard_num = 3 [ default = 1000 ];
-  optional TableAccessorParameter accessor = 4;
-  optional TableType type = 5;
-  optional bool compress_in_save = 6 [ default = false ];
-  optional bool enable_sparse_table_cache = 7 [ default = true ];
-  optional double sparse_table_cache_rate = 8 [ default = 0.00055 ];
-  optional uint32 sparse_table_cache_file_num = 9 [ default = 16 ];
+    optional uint64 table_id = 1;
+    optional string table_class = 2;
+    optional uint64 shard_num = 3 [ default = 1000 ];
+    optional TableAccessorParameter accessor = 4;
+    optional TableType type = 5;
+    optional bool compress_in_save = 6 [default = false];
+    //for cache model
+    optional bool enable_sparse_table_cache = 7 [default = true];
+    optional double sparse_table_cache_rate = 8 [default = 0.00055];
+    optional uint32 sparse_table_cache_file_num = 9 [default = 16];
+    optional double sparse_table_mem_cache_rate = 10 [default = 0.5];
+
 }
 
 message TableAccessorParameter {
-  optional string accessor_class = 1;
-  optional SparseSGDRuleParameter sparse_sgd_param = 2;
-  optional DenseSGDRuleParameter dense_sgd_param = 3;
-  optional uint32 fea_dim = 4 [ default = 11 ];
-  optional uint32 embedx_dim = 5 [ default = 8 ];
-  optional uint32 embedx_threshold = 6 [ default = 10 ];
-  optional DownpourTableAccessorParameter downpour_accessor_param = 7;
-  repeated TableAccessorSaveParameter table_accessor_save_param = 8;
-  optional SparseCommonSGDRuleParameter sparse_commonsgd_param = 9;
-  optional SparseCommonSGDRuleParameter embed_sgd_param = 10;
-  optional SparseCommonSGDRuleParameter embedx_sgd_param = 11;
+    optional string accessor_class = 1;
+    optional SparseSGDRuleParameter sparse_sgd_param = 2;
+    optional DenseSGDRuleParameter dense_sgd_param = 3;
+    optional uint32 fea_dim = 4 [default = 11];
+    optional uint32 embedx_dim = 5 [default = 8];
+    optional uint32 embedx_threshold = 6 [default = 10];
+    optional DownpourTableAccessorParameter downpour_accessor_param = 7;
+    repeated TableAccessorSaveParameter table_accessor_save_param = 8;
+    optional SparseCommonSGDRuleParameter sparse_commonsgd_param = 9;
+    optional SparseCommonSGDRuleParameter embed_sgd_param = 10;
+    optional SparseCommonSGDRuleParameter embedx_sgd_param = 11;
 }
 
 message DownpourTableAccessorParameter {
-  optional float nonclk_coeff = 1 [ default = 0.1 ];
-  optional float click_coeff = 2 [ default = 1 ];
-  optional float base_threshold = 3 [ default = 1.5 ];
-  optional float delta_threshold = 4 [ default = 0.25 ];
-  optional float delta_keep_days = 5 [ default = 16 ];
-  optional float show_click_decay_rate = 6 [ default = 0.98 ];
-  optional float delete_threshold = 7 [ default = 0.8 ];
-  optional float delete_after_unseen_days = 8 [ default = 30 ];
-  optional int32 ssd_unseenday_threshold = 9 [ default = 1 ];
+    optional float nonclk_coeff = 1 [default = 0.1];             // to calculate show_click_score
+    optional float click_coeff = 2 [default = 1];                // to calculate show_click_score
+    optional float base_threshold = 3 [default = 1.5];           // show_click_score > base_threshold, this feature can be saved
+    optional float delta_threshold = 4 [default = 0.25];         // delta_score > delta_threshold, this feature can be saved
+    optional float delta_keep_days = 5 [default = 16];           // unseen_day < delta_keep_days, this feature can be saved
+    optional float show_click_decay_rate = 6 [default = 0.98];   // show/click will update to show/click * show_click_decay_rate after a day
+    optional float delete_threshold = 7 [default = 0.8];         // threshold to shrink a feasign
+    optional float delete_after_unseen_days = 8 [default = 30];  // unseen_day > delete_after_unseen_days, this feature will be delete in shrink_model
+    optional int32 ssd_unseenday_threshold = 9 [default = 1];    // threshold to save ssd
 }
 
 message TableAccessorSaveParameter {
-  optional uint32 param = 1;
-  optional string converter = 2;
-  optional string deconverter = 3;
+    optional uint32 param = 1;
+    optional string converter = 2;
+    optional string deconverter = 3;
 }
 
-message PsRequestMessage {
-  required uint32 cmd_id = 1;
-  optional uint32 table_id = 2;
-  repeated bytes params = 3;
-  optional int32 client_id = 4;
-  optional bytes data = 5;
+enum PsCmdID {
+    PS_PULL_DENSE_TABLE                      = 0;
+    PS_PUSH_DENSE_TABLE                      = 1;
+    PS_PULL_SPARSE_TABLE                     = 2;
+    PS_PUSH_SPARSE_TABLE                     = 3;
+    PS_SHRINK_TABLE                          = 4;
+    PS_SAVE_ONE_TABLE                        = 5;
+    PS_SAVE_ALL_TABLE                        = 6;
+    PS_LOAD_ONE_TABLE                        = 7;
+    PS_LOAD_ALL_TABLE                        = 8;
+    PS_CLEAR_ONE_TABLE                       = 9;
+    PS_CLEAR_ALL_TABLE                       = 10;
+    PS_PUSH_DENSE_PARAM                      = 11;
+    PS_STOP_SERVER                           = 12;
+    PS_SAVE_ONE_CACHE_TABLE                  = 13;
+    PS_GET_CACHE_THRESHOLD                   = 14;
+    PS_CACHE_SHUFFLE                         = 15;
+    PS_COPY_TABLE                            = 16;
+    PS_COPY_TABLE_BY_FEASIGN                 = 17;
+    PS_PULL_SPARSE_TABLE_WITH_DEPENDENCY     = 18;
+    PS_PUSH_SPARSE_TABLE_WITH_DEPENDENCY     = 19;
+    PS_PRINT_TABLE_STAT                      = 20;
+    PS_SAVE_ONE_TABLE_PREFIX                 = 21;
+    PS_SAVE_MEM_CACHE_TABLE                  = 22;
+    //pserver2pserver cmd start from 100
+    PS_S2S_MSG                               = 101;
+    //local_client2local_client cmd start from 200
+    PS_C2C_PULL_SPARSE_TABLE                 = 201;
 }
 
+message PsRequestMessage {
+    required uint32 cmd_id = 1;
+    optional uint32 table_id = 2;
+    repeated bytes params = 3;
+    optional int32 client_id = 4;
+    optional bytes data = 5;
+};
+
 message SparseSGDRuleParameter {
-  optional double learning_rate = 1 [ default = 0.05 ];
-  optional double initial_g2sum = 2 [ default = 3 ];
-  optional double initial_range = 3 [ default = 0.0001 ];
-  repeated float weight_bounds = 4;
+    optional double learning_rate = 1 [default = 0.05];
+    optional double initial_g2sum = 2 [default = 3.0];
+    optional double initial_range = 3 [default = 0.0001];
+    repeated float weight_bounds = 4;
 }
 
 message SparseCommonSGDRuleParameter {
-  optional string name = 1;
-  optional SparseNaiveSGDRuleParameter naive = 2;
-  optional SparseAdagradSGDRuleParameter adagrad = 3;
-  optional SparseAdamSGDParameter adam = 4;
+    optional string name = 1;
+    optional SparseNaiveSGDRuleParameter naive = 2;
+    optional SparseAdagradSGDRuleParameter adagrad = 3;
+    optional SparseAdamSGDParameter adam = 4;
 }
 
 message SparseNaiveSGDRuleParameter {
-  optional double learning_rate = 1 [ default = 0.05 ];
-  optional double initial_range = 2 [ default = 0.0001 ];
-  repeated float weight_bounds = 3;
+    optional double learning_rate = 1 [default = 0.05];
+    optional double initial_range = 2 [default = 0.0001];
+    repeated float weight_bounds = 3;
 }
 
 message SparseAdagradSGDRuleParameter {
-  optional double learning_rate = 1 [ default = 0.05 ];
-  optional double initial_g2sum = 2 [ default = 3 ];
-  optional double initial_range = 3 [ default = 0.0001 ];
-  repeated float weight_bounds = 4;
+    optional double learning_rate = 1 [default = 0.05];
+    optional double initial_g2sum = 2 [default = 3.0];
+    optional double initial_range = 3 [default = 0.0001];
+    repeated float weight_bounds = 4;
 }
 
 message SparseAdamSGDParameter {
-  optional double learning_rate = 1 [ default = 0.001 ];
-  optional double initial_range = 2 [ default = 0.0001 ];
-  optional double beta1_decay_rate = 3 [ default = 0.9 ];
-  optional double beta2_decay_rate = 4 [ default = 0.999 ];
-  optional double ada_epsilon = 5 [ default = 1e-08 ];
-  repeated float weight_bounds = 6;
+    optional double learning_rate = 1 [default = 0.001];
+    optional double initial_range = 2 [default = 0.0001];
+    optional double beta1_decay_rate = 3 [default = 0.9];
+    optional double beta2_decay_rate = 4 [default = 0.999];
+    optional double ada_epsilon = 5 [default = 1e-08];
+    repeated float weight_bounds = 6;
 }
 
 message DenseSGDRuleParameter {
-  optional string name = 1;
-  optional AdamSGDParameter adam = 2;
-  optional NaiveSGDParameter naive = 3;
-  optional SummarySGDParameter summary = 4;
-  optional MovingAverageRuleParameter moving_average = 5;
+    optional string name = 1;
+    optional AdamSGDParameter adam = 2;
+    optional NaiveSGDParameter naive = 3;
+    optional SummarySGDParameter summary = 4;
+    optional MovingAverageRuleParameter moving_average = 5;
 }
 
 message AdamSGDParameter {
-  optional double learning_rate = 1 [ default = 5e-06 ];
-  optional double avg_decay_rate = 2 [ default = 0.999993 ];
-  optional double ada_decay_rate = 3 [ default = 0.9999 ];
-  optional double ada_epsilon = 4 [ default = 1e-08 ];
-  optional double mom_decay_rate = 5 [ default = 0.99 ];
+    optional double learning_rate = 1 [default = 5e-06];         // \u5B66\u4E60\u7387
+    optional double avg_decay_rate = 2 [default = 0.999993];     // avg_weight\u7684\u8870\u51CF\u7CFB\u6570
+    optional double ada_decay_rate = 3 [default = 0.9999];
+    optional double ada_epsilon = 4 [default = 1e-08];
+    optional double mom_decay_rate = 5 [default = 0.99];
 }
 
 message NaiveSGDParameter {
-  optional double learning_rate = 1 [ default = 0.0002 ];
-  optional double avg_decay_rate = 2;
+    optional double learning_rate = 1 [default = 0.0002];
+    optional double avg_decay_rate = 2;
 }
 
 message SummarySGDParameter {
-  optional double summary_decay_rate = 1 [ default = 0.999999 ];
+    optional double summary_decay_rate = 1 [default = 0.999999];     // \u6743\u91CD\u7684\u8870\u51CF\u7CFB\u6570
 }
 
 message MovingAverageRuleParameter {
-  optional double momentum = 1;
+    optional double momentum = 1;
 }
 
 message PsResponseMessage {
-  required int32 err_code = 1 [ default = 0 ];
-  required string err_msg = 2;
-  optional bytes data = 3;
-}
-
-message FsClientParameter {
-  enum FsApiType {
-    HDFS = 0;
-    AFS = 1;
-  }
-
-  optional FsApiType fs_type = 1 [ default = HDFS ];
-  optional string uri = 2;
-  optional string user = 3;
-  optional string passwd = 4;
-  optional int32 buffer_size = 5;
-  optional string hadoop_bin = 51;
-  optional string afs_conf = 101;
-}
+    required int32 err_code = 1 [default = 0];
+    required string err_msg = 2 [default = ""];
+    optional bytes data = 3;
+};
 
 service PsService {
-  rpc service(PsRequestMessage) returns (PsResponseMessage);
+    rpc service(PsRequestMessage) returns (PsResponseMessage);
+};
+
+message FsClientParameter {
+    enum FsApiType {
+         HDFS = 0;
+         AFS = 1;
+    }
+    optional FsApiType fs_type      = 1 [default = HDFS];
+    optional string    uri          = 2;                  //such as afs://tianqi.afs.baidu.com:9902
+    optional string    user         = 3;                  //user_name to access fs
+    optional string    passwd       = 4;                  //password
+    optional int32     buffer_size  = 5;                  //buffer for read/write
+    optional string hadoop_bin = 51;
+    optional string afs_conf = 101;
 }