decrease size of pool allocators used by singletons/multitons

Full replay test showed there is no point in fine tuning pool allocator block size to the upside, because we can reduce
number of block allocations/releases from thousands to tens, which gives no measurable performance benefit, but for the
price of higher overhead and much higher initial allocation.

Author: ABW

libraries/chain/include/hive/chain/block_summary_object.hpp

@@ -29,7 +29,7 @@ namespace hive { namespace chain {
       ordered_unique< tag< by_id >,
         const_mem_fun< block_summary_object, block_summary_object::id_type, &block_summary_object::get_id > >
     >,
-    multi_index_allocator< block_summary_object >
+    multi_index_allocator< block_summary_object > // multiton (exactly 64k objects plus one internal)
   > block_summary_index;
 
 } } // hive::chain

libraries/chain/include/hive/chain/global_property_object.hpp

@@ -179,7 +179,7 @@ namespace hive { namespace chain {
       ordered_unique< tag< by_id >,
         const_mem_fun< dynamic_global_property_object, dynamic_global_property_object::id_type, &dynamic_global_property_object::get_id > >
     >,
-    allocator< dynamic_global_property_object >
+    multi_index_allocator< dynamic_global_property_object, 2 > // singleton (plus one internal)
   > dynamic_global_property_index;
 
 } } // hive::chain

libraries/chain/include/hive/chain/hardfork_property_object.hpp

@@ -52,7 +52,7 @@ namespace hive { namespace chain {
       ordered_unique< tag< by_id >,
         const_mem_fun< hardfork_property_object, hardfork_property_object::id_type, &hardfork_property_object::get_id > >
     >,
-    multi_index_allocator< hardfork_property_object >
+    multi_index_allocator< hardfork_property_object, 2 > // singleton (plus one internal)
   > hardfork_property_index;
 
 } } // hive::chain

libraries/chain/include/hive/chain/hive_objects.hpp

@@ -506,7 +506,7 @@ namespace hive { namespace chain {
         composite_key_compare< std::greater< fc::uint128 >, std::less< account_id_type > >
       >
     >,
-    multi_index_allocator< liquidity_reward_balance_object >
+    multi_index_allocator< liquidity_reward_balance_object, 1024 > // not used after HF12
   > liquidity_reward_balance_index;
 
   typedef multi_index_container<
@@ -515,7 +515,7 @@ namespace hive { namespace chain {
       ordered_unique< tag< by_id >,
         const_mem_fun< feed_history_object, feed_history_object::id_type, &feed_history_object::get_id > >
     >,
-    multi_index_allocator< feed_history_object >
+    multi_index_allocator< feed_history_object, 2 > // singleton (plus one internal)
   > feed_history_index;
 
   struct by_withdraw_route;
@@ -628,7 +628,7 @@ namespace hive { namespace chain {
       ordered_unique< tag< by_name >,
         member< reward_fund_object, reward_fund_name_type, &reward_fund_object::name > >
     >,
-    multi_index_allocator< reward_fund_object >
+    multi_index_allocator< reward_fund_object, 2 > // singleton (plus one internal)
   > reward_fund_index;
 
   struct by_from_to_id;

libraries/chain/include/hive/chain/rc/rc_objects.hpp

@@ -261,7 +261,7 @@ typedef multi_index_container<
     ordered_unique< tag< by_id >,
       const_mem_fun< rc_resource_param_object, rc_resource_param_object::id_type, &rc_resource_param_object::get_id > >
   >,
-  multi_index_allocator< rc_resource_param_object >
+  multi_index_allocator< rc_resource_param_object, 2 > // singleton (plus one internal)
 > rc_resource_param_index;
 
 typedef multi_index_container<
@@ -270,7 +270,7 @@ typedef multi_index_container<
     ordered_unique< tag< by_id >,
       const_mem_fun< rc_pool_object, rc_pool_object::id_type, &rc_pool_object::get_id > >
   >,
-  multi_index_allocator< rc_pool_object >
+  multi_index_allocator< rc_pool_object, 2 > // singleton (plus one internal)
 > rc_pool_index;
 
 typedef multi_index_container<
@@ -279,7 +279,7 @@ typedef multi_index_container<
     ordered_unique< tag< by_id >,
       const_mem_fun< rc_stats_object, rc_stats_object::id_type, &rc_stats_object::get_id > >
   >,
-  multi_index_allocator< rc_stats_object >
+  multi_index_allocator< rc_stats_object, 4 > // dubleton (plus one internal)
 > rc_stats_index;
 
 struct by_from_to;
@@ -320,7 +320,7 @@ typedef multi_index_container<
     ordered_unique< tag< by_timestamp >,
       const_mem_fun< rc_usage_bucket_object, time_point_sec, &rc_usage_bucket_object::get_timestamp > >
   >,
-  multi_index_allocator< rc_usage_bucket_object >
+  multi_index_allocator< rc_usage_bucket_object, 32 > // multiton (always 24 plus one internal)
 > rc_usage_bucket_index;
 
 } } // hive::chain

libraries/chain/include/hive/chain/witness_objects.hpp

@@ -308,7 +308,7 @@ namespace hive { namespace chain {
       ordered_unique< tag< by_id >,
         const_mem_fun< witness_schedule_object, witness_schedule_object::id_type, &witness_schedule_object::get_id > >
     >,
-    multi_index_allocator< witness_schedule_object >
+    multi_index_allocator< witness_schedule_object, 4 > // dubleton (plus one internal)
   > witness_schedule_index;
 
 } }