ethcore client config

parity/cli.rs

@@ -170,7 +170,13 @@ Footprint Options:
   --cache MEGABYTES        Set total amount of discretionary memory to use for
                            the entire system, overrides other cache and queue
                            options.
-  --db-cache-size MB       Database cache size.
+
+Database Options:
+  --db-cache-size MB       Database cache size. Default if not specified.
+  --db-compaction TYPE     Database compaction type. TYPE may be one of default, hdd
+                           default - suitable for ssd backing storage/fast hdd
+                           hdd - sutable for slow storage
+                           [default: default].
 
 Import/Export Options:
   --from BLOCK             Export from block BLOCK, which may be an index or
@@ -323,6 +329,7 @@ pub struct Args {
 	pub flag_ipcpath: Option<String>,
 	pub flag_ipcapi: Option<String>,
 	pub flag_db_cache_size: Option<usize>,
+	pub flag_db_compaction: String,
 }
 
 pub fn print_version() {

parity/configuration.rs

@@ -278,6 +278,13 @@ impl Configuration {
 		// forced state db cache size if provided
 		client_config.db_cache_size = self.args.flag_db_cache_size.and_then(|cs| Some(cs / 4));
 
+		// compaction profile
+		client_config.db_compaction_profile = match self.args.flag_db_compaction.as_str() {
+			"default" => DatabaseCompactionProfile::Default,
+			"hdd" => DatabaseCompactionProfile::HDD,
+			_ => { die!("Invalid compaction profile given (--db-compaction argument), expected hdd/default."); }
+		};
+
 		if self.args.flag_jitvm {
 			client_config.vm_type = VMType::jit().unwrap_or_else(|| die!("Parity built without jit vm."))
 		}