Adjust pool defaults for many core systems with undetected topologies.

Signed-off-by: Jason Volk <jason@zemos.net>

src/core/config/mod.rs

@@ -1987,8 +1987,7 @@ pub struct Config {
 	/// Sets the number of worker threads in the frontend-pool of the database.
 	/// This number should reflect the I/O capabilities of the system,
 	/// such as the queue-depth or the number of simultaneous requests in
-	/// flight. Defaults to 32 or four times the number of CPU cores, whichever
-	/// is greater.
+	/// flight. Defaults to 32 times the number of CPU cores.
 	///
 	/// Note: This value is only used if db_pool_affinity is disabled or not
 	/// detected on the system, otherwise it is determined automatically.

src/database/pool/configure.rs

@@ -69,7 +69,8 @@ pub(super) fn configure(server: &Arc<Server>) -> (Vec<usize>, Vec<usize>, Vec<us
 	// The default worker count is masked-on if we didn't find better information.
 	let default_worker_count = topology_detected
 		.is_false()
-		.then_some(config.db_pool_workers);
+		.then_some(config.db_pool_workers)
+		.map(|workers| workers.saturating_mul(num_cores));
 
 	// Sum the total number of possible tags. When no hardware detected this will
 	// default to the default_worker_count. Note well that the thread-worker model