Shuffle workers to get routers on random cores. Increase routerScaleSize default to 40.

server/config/config.example.js

@@ -247,10 +247,11 @@ module.exports =
 	// When truthy, the room will be open to all users when as long as there
 	// are allready users in the room
 	activateOnHostJoin : true,
-	// When set, maxUsersPerRoom defines how many users can join a single room. If not set, there is not limit.
+	// When set, maxUsersPerRoom defines how many users can join
+	// a single room. If not set, there is no limit.
 	// maxUsersPerRoom    : 20,
 	// Room size before spreading to new router
-	routerScaleSize    : 20,
+	routerScaleSize    : 40,
 	// Mediasoup settings
 	mediasoup          :
 	{

server/lib/Room.js

@@ -31,7 +31,7 @@ const permissionsFromRoles =
 	...config.permissionsFromRoles
 };
 
-const ROUTER_SCALE_SIZE = config.routerScaleSize || 20;
+const ROUTER_SCALE_SIZE = config.routerScaleSize || 40;
 
 class Room extends EventEmitter
 {
@@ -48,6 +48,9 @@ class Room extends EventEmitter
 	{
 		logger.info('create() [roomId:"%s"]', roomId);
 
+		// Shuffle workers to get random cores
+		let shuffledWorkers = mediasoupWorkers.sort(() => Math.random() - 0.5);
+
 		// Router media codecs.
 		const mediaCodecs = config.mediasoup.router.mediaCodecs;
 
@@ -55,7 +58,7 @@ class Room extends EventEmitter
 
 		let firstRouter = null;
 
-		for (const worker of mediasoupWorkers)
+		for (const worker of shuffledWorkers)
 		{
 			const router = await worker.createRouter({ mediaCodecs });
 
@@ -74,6 +77,7 @@ class Room extends EventEmitter
 			});
 
 		firstRouter = null;
+		shuffledWorkers = null;
 
 		return new Room({ roomId, mediasoupRouters, audioLevelObserver });
 	}