cache manager and clearing tracing cache (#1769)

* removed configure_cache method

* generic cache_manager struct

* fixed #1743, tracing caches are cleared

* removed deadlocks in garbage_collect, implemented HeapSizeOf for traces

* trace cache config

* fixed carbage typo

parity/cache.rs

@@ -20,6 +20,7 @@ const MIN_BC_CACHE_MB: u32 = 4;
 const MIN_DB_CACHE_MB: u32 = 2;
 const MIN_BLOCK_QUEUE_SIZE_LIMIT_MB: u32 = 16;
 const DEFAULT_BLOCK_QUEUE_SIZE_LIMIT_MB: u32 = 50;
+const DEFAULT_TRACE_CACHE_SIZE: u32 = 20;
 
 /// Configuration for application cache sizes.
 /// All	values are represented in MB.
@@ -34,6 +35,8 @@ pub struct CacheConfig {
 	blockchain: u32,
 	/// Size of transaction queue cache.
 	queue: u32,
+	/// Size of traces cache.
+	traces: u32,
 }
 
 impl Default for CacheConfig {
@@ -49,6 +52,7 @@ impl CacheConfig {
 			db: total * 7 / 8,
 			blockchain: total / 8,
 			queue: DEFAULT_BLOCK_QUEUE_SIZE_LIMIT_MB,
+			traces: DEFAULT_TRACE_CACHE_SIZE,
 		}
 	}
 
@@ -58,6 +62,7 @@ impl CacheConfig {
 			db: db,
 			blockchain: blockchain,
 			queue: queue,
+			traces: DEFAULT_TRACE_CACHE_SIZE,
 		}
 	}
 
@@ -80,6 +85,11 @@ impl CacheConfig {
 	pub fn blockchain(&self) -> u32 {
 		max(self.blockchain, MIN_BC_CACHE_MB)
 	}
+
+	/// Size of the traces cache.
+	pub fn traces(&self) -> u32 {
+		self.traces
+	}
 }
 
 #[cfg(test)]

parity/helpers.rs

@@ -212,6 +212,10 @@ pub fn to_client_config(
 	client_config.db_cache_size = Some(cache_config.db_state_cache_size() as usize);
 	// db queue cache size, in bytes
 	client_config.queue.max_mem_use = cache_config.queue() as usize * mb;
+	// in bytes
+	client_config.tracing.max_cache_size = cache_config.traces() as usize * mb;
+	// in bytes
+	client_config.tracing.pref_cache_size = cache_config.traces() as usize * 3 / 4 * mb;
 
 	client_config.mode = mode;
 	client_config.tracing.enabled = tracing;