configurable cache size

ethcore/src/blockchain/blockchain.rs

@@ -253,12 +253,22 @@ impl BlockChain {
 		// open extras db
 		let mut extras_path = path.to_path_buf();
 		extras_path.push("extras");
-		let extras_db = Database::open_default(extras_path.to_str().unwrap()).unwrap();
+		let extras_db = match config.db_cache_size {
+			None => Database::open_default(extras_path.to_str().unwrap()).unwrap(),
+			Some(cache_size) => Database::open(
+				&DatabaseConfig::with_cache(cache_size/2),
+				extras_path.to_str().unwrap()).unwrap(),
+		};
 
 		// open blocks db
 		let mut blocks_path = path.to_path_buf();
 		blocks_path.push("blocks");
-		let blocks_db = Database::open_default(blocks_path.to_str().unwrap()).unwrap();
+		let blocks_db = match config.db_cache_size {
+			None => Database::open_default(blocks_path.to_str().unwrap()).unwrap(),
+			Some(cache_size) => Database::open(
+				&DatabaseConfig::with_cache(cache_size/2),
+				blocks_path.to_str().unwrap()).unwrap(),
+		};
 
 		let mut cache_man = CacheManager{cache_usage: VecDeque::new(), in_use: HashSet::new()};
 		(0..COLLECTION_QUEUE_SIZE).foreach(|_| cache_man.cache_usage.push_back(HashSet::new()));

ethcore/src/blockchain/config.rs

@@ -23,6 +23,8 @@ pub struct Config {
 	pub pref_cache_size: usize,
 	/// Maximum cache size in bytes.
 	pub max_cache_size: usize,
+	/// Backing db cache_size
+	pub db_cache_size: Option<usize>,
 }
 
 impl Default for Config {
@@ -30,6 +32,7 @@ impl Default for Config {
 		Config {
 			pref_cache_size: 1 << 14,
 			max_cache_size: 1 << 20,
+			db_cache_size: None,
 		}
 	}
 }

ethcore/src/client/client.rs

@@ -141,7 +141,10 @@ impl<V> Client<V> where V: Verifier {
 		let chain = Arc::new(BlockChain::new(config.blockchain, &gb, &path));
 		let tracedb = Arc::new(try!(TraceDB::new(config.tracing, &path, chain.clone())));
 
-		let mut state_db = journaldb::new(&append_path(&path, "state"), config.pruning);
+		let mut state_db = journaldb::new(
+			&append_path(&path, "state"),
+			config.pruning,
+			config.db_cache_size);
 
 		if state_db.is_empty() && spec.ensure_db_good(state_db.as_hashdb_mut()) {
 			state_db.commit(0, &spec.genesis_header().hash(), None).expect("Error commiting genesis state to state DB");

ethcore/src/client/config.rs

@@ -35,4 +35,6 @@ pub struct ClientConfig {
 	pub pruning: journaldb::Algorithm,
 	/// The name of the client instance.
 	pub name: String,
+	/// State db cache-size if not default
+	pub db_cache_size: Option<usize>,
 }

ethcore/src/trace/config.rs

@@ -48,6 +48,8 @@ pub struct Config {
 	pub enabled: Switch,
 	/// Traces blooms configuration.
 	pub blooms: BloomConfig,
+	/// Database cache-size if not default
+	pub db_cache_size: Option<usize>,
 }
 
 impl Default for Config {
@@ -57,7 +59,8 @@ impl Default for Config {
 			blooms: BloomConfig {
 				levels: 3,
 				elements_per_index: 16,
-			}
+			},
+			db_cache_size: None,
 		}
 	}
 }

ethcore/src/trace/db.rs

@@ -22,7 +22,7 @@ use std::sync::{RwLock, Arc};
 use std::path::Path;
 use bloomchain::{Number, Config as BloomConfig};
 use bloomchain::group::{BloomGroupDatabase, BloomGroupChain, GroupPosition, BloomGroup};
-use util::{H256, H264, Database, DBTransaction};
+use util::{H256, H264, Database, DatabaseConfig, DBTransaction};
 use header::BlockNumber;
 use trace::{BlockTraces, LocalizedTrace, Config, Switch, Filter, Database as TraceDatabase, ImportRequest,
 DatabaseExtras, Error};
@@ -118,7 +118,12 @@ impl<T> TraceDB<T> where T: DatabaseExtras {
 	pub fn new(config: Config, path: &Path, extras: Arc<T>) -> Result<Self, Error> {
 		let mut tracedb_path = path.to_path_buf();
 		tracedb_path.push("tracedb");
-		let tracesdb = Database::open_default(tracedb_path.to_str().unwrap()).unwrap();
+		let tracesdb = match config.db_cache_size {
+			None => Database::open_default(tracedb_path.to_str().unwrap()).unwrap(),
+			Some(db_cache) => Database::open(
+				&DatabaseConfig::with_cache(db_cache),
+				tracedb_path.to_str().unwrap()).unwrap(),
+		};
 
 		// check if in previously tracing was enabled
 		let old_tracing = match tracesdb.get(b"enabled").unwrap() {