From 575726358c72772b7be00d0f8eaff76506118f7a Mon Sep 17 00:00:00 2001
From: Alex Auvolat <alex@adnab.me>
Date: Mon, 3 May 2021 17:27:43 +0200
Subject: [PATCH] Tune Sled configuration

- Make sled cache size and flush interval configurable
- Set less agressive default values:
  - cache size 128MB instead of 1GB
  - Flush interval 2 seconds instead of .5 seconds
---
 src/garage/server.rs |  7 ++++++-
 src/util/config.rs   | 14 ++++++++++++++
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/src/garage/server.rs b/src/garage/server.rs
index 97a9bec2..3004d3d2 100644
--- a/src/garage/server.rs
+++ b/src/garage/server.rs
@@ -40,7 +40,12 @@ pub async fn run_server(config_file: PathBuf) -> Result<(), Error> {
 	info!("Opening database...");
 	let mut db_path = config.metadata_dir.clone();
 	db_path.push("db");
-	let db = sled::open(&db_path).expect("Unable to open sled DB");
+	let db = sled::Config::default()
+		.path(&db_path)
+		.cache_capacity(config.sled_cache_capacity)
+		.flush_every_ms(Some(config.sled_flush_every_ms))
+		.open()
+		.expect("Unable to open sled DB");
 
 	info!("Initialize RPC server...");
 	let mut rpc_server = RpcServer::new(config.rpc_bind_addr.clone(), config.rpc_tls.clone());
diff --git a/src/util/config.rs b/src/util/config.rs
index bb70467b..093b3850 100644
--- a/src/util/config.rs
+++ b/src/util/config.rs
@@ -26,6 +26,14 @@ pub struct Config {
 	/// Consul service name to use
 	pub consul_service_name: Option<String>,
 
+	/// Sled cache size, in bytes
+	#[serde(default = "default_sled_cache_capacity")]
+	pub sled_cache_capacity: u64,
+
+	/// Sled flush interval in milliseconds
+	#[serde(default = "default_sled_flush_every_ms")]
+	pub sled_flush_every_ms: u64,
+
 	/// Max number of concurrent RPC request
 	#[serde(default = "default_max_concurrent_rpc_requests")]
 	pub max_concurrent_rpc_requests: usize,
@@ -86,6 +94,12 @@ pub struct WebConfig {
 	pub index: String,
 }
 
+fn default_sled_cache_capacity() -> u64 {
+	128 * 1024 * 1024
+}
+fn default_sled_flush_every_ms() -> u64 {
+	2000
+}
 fn default_max_concurrent_rpc_requests() -> usize {
 	12
 }