[WIP] improving thread pool usage and bot client.

Cargo.lock

@@ -6786,6 +6786,7 @@ dependencies = [
  "hashbrown 0.12.3",
  "image",
  "num 0.4.0",
+ "num_cpus",
  "quinn",
  "rayon",
  "ron 0.8.0",
@@ -6973,7 +6974,11 @@ dependencies = [
  "specs",
  "tar",
  "thread-priority",
+<<<<<<< HEAD
  "timer-queue",
+=======
+ "tokio",
+>>>>>>> 60060a9913 ([WIP] improving thread pool usage and bot client.)
  "toml",
  "tracing",
  "vek 0.15.8",

client/Cargo.toml

@@ -24,6 +24,7 @@ network = { package = "veloren-network", path = "../network", features = ["compr
 bincode = "1.3.2"
 byteorder = "1.3.2"
 crossbeam-channel = "0.5"
+num_cpus = "1.0"
 tokio = { version = "1.14", default-features = false, features = ["rt-multi-thread"] }
 quinn = "0.8"
 image = { version = "0.24", default-features = false, features = ["png"] }

client/examples/chat-cli/main.rs

@@ -56,11 +56,15 @@ fn main() {
     };
 
     // Create a client.
-    let mut client = runtime
+    let pools = common_state::State::pools(
+        common::resources::GameMode::Client,
+        tokio::runtime::Builder::new_multi_thread(),
+    );
+    let mut client = pools.runtime
         .block_on(Client::new(
             addr,
-            runtime2,
             &mut None,
+            pools.clone(),
             &username,
             &password,
             |provider| provider == "https://auth.veloren.net",

client/src/bin/bot/main.rs

@@ -46,29 +46,28 @@ pub fn main() {
 
 pub struct BotClient {
     settings: Settings,
-    runtime: Arc<Runtime>,
+    pools: common_state::Pools,
     server_info: ServerInfo,
     bot_clients: HashMap<String, Client>,
     clock: Clock,
 }
 
 pub fn make_client(
-    runtime: &Arc<Runtime>,
+    pools: &common_state::Pools,
     server: &str,
     server_info: &mut Option<ServerInfo>,
     username: &str,
     password: &str,
 ) -> Option<Client> {
-    let runtime_clone = Arc::clone(runtime);
     let addr = ConnectionArgs::Tcp {
         prefer_ipv6: false,
         hostname: server.to_owned(),
     };
-    runtime
+    pools.runtime
         .block_on(Client::new(
             addr,
-            runtime_clone,
             server_info,
+            pools.clone(),
             username,
             password,
             |_| true,
@@ -78,15 +77,18 @@ pub fn make_client(
 
 impl BotClient {
     pub fn new(settings: Settings) -> BotClient {
-        let runtime = Arc::new(Runtime::new().unwrap());
+        let pools = common_state::State::pools(
+            common::resources::GameMode::Client,
+            tokio::runtime::Builder::new_multi_thread(),
+        );
         let mut server_info = None;
         // Don't care if we connect, just trying to grab the server info.
-        let _ = make_client(&runtime, &settings.server, &mut server_info, "", "");
+        let _ = make_client(&pools, &settings.server, &mut server_info, "", "");
         let server_info = server_info.expect("Failed to connect to server.");
         let clock = Clock::new(Duration::from_secs_f64(1.0 / 60.0));
         BotClient {
             settings,
-            runtime,
+            pools,
             server_info,
             bot_clients: HashMap::new(),
             clock,
@@ -142,7 +144,7 @@ impl BotClient {
                 {
                     continue;
                 }
-                match self.runtime.block_on(authc.register(username, password)) {
+                match self.pools.runtime.block_on(authc.register(username, password)) {
                     Ok(()) => {
                         self.settings.bot_logins.push(BotCreds {
                             username: username.to_string(),
@@ -171,15 +173,13 @@ impl BotClient {
             .cloned()
             .collect();
         for cred in creds.iter() {
-            let runtime = Arc::clone(&self.runtime);
-
             let server = &self.settings.server;
             // TODO: log the clients in in parallel instead of in series
             let client = self
                 .bot_clients
                 .entry(cred.username.clone())
                 .or_insert_with(|| {
-                    make_client(&runtime, server, &mut None, &cred.username, &cred.password)
+                    make_client(&self.pools, server, &mut None, &cred.username, &cred.password)
                         .expect("Failed to connect to server")
                 });
 

client/src/bin/swarm/main.rs

@@ -13,7 +13,7 @@ use std::{
     time::{Duration, SystemTime},
 };
 use structopt::StructOpt;
-use tokio::runtime::Runtime;
+use tokio::runtime::{self, Runtime};
 use vek::*;
 use veloren_client::{addr::ConnectionArgs, Client};
 
@@ -53,7 +53,12 @@ fn main() {
     let to_adminify = usernames.clone();
 
     let finished_init = Arc::new(AtomicU32::new(0));
-    let runtime = Arc::new(Runtime::new().unwrap());
+    let mut builder = runtime::Builder::new_multi_thread();
+    builder
+        .max_blocking_threads(opt.size as usize + 1)
+        .thread_name("swarm");
+    let mut pools = common_state::State::pools(common::resources::GameMode::Client, builder);
+    pools.slowjob_threads = 0;
 
     // TODO: calculate and log the required chunks per second to maintain the
     // selected scenario with full vd loaded
@@ -62,7 +67,7 @@ fn main() {
         admin_username,
         0,
         to_adminify,
-        &runtime,
+        &pools,
         opt,
         &finished_init,
     );
@@ -72,7 +77,7 @@ fn main() {
             name,
             index as u32,
             Vec::new(),
-            &runtime,
+            &pools,
             opt,
             &finished_init,
         );
@@ -85,14 +90,15 @@ fn run_client_new_thread(
     username: String,
     index: u32,
     to_adminify: Vec<String>,
-    runtime: &Arc<Runtime>,
+    pools: &common_state::Pools,
     opt: Opt,
     finished_init: &Arc<AtomicU32>,
 ) {
-    let runtime = Arc::clone(runtime);
+    let runtime = Arc::clone(&pools.runtime);
+    let pools = pools.clone();
     let finished_init = Arc::clone(finished_init);
     thread::spawn(move || {
-        if let Err(err) = run_client(username, index, to_adminify, runtime, opt, finished_init) {
+        if let Err(err) = run_client(username, index, to_adminify, pools, opt, finished_init) {
             tracing::error!("swarm member {} exited with an error: {:?}", index, err);
         }
     });
@@ -102,44 +108,42 @@ fn run_client(
     username: String,
     index: u32,
     to_adminify: Vec<String>,
-    runtime: Arc<Runtime>,
+    pools: common_state::Pools,
     opt: Opt,
     finished_init: Arc<AtomicU32>,
 ) -> Result<(), veloren_client::Error> {
-    let mut client = loop {
-        // Connect to localhost
-        let addr = ConnectionArgs::Tcp {
-            prefer_ipv6: false,
-            hostname: "localhost".into(),
-        };
-        let runtime_clone = Arc::clone(&runtime);
-        // NOTE: use a no-auth server
-        match runtime.block_on(Client::new(
-            addr,
-            runtime_clone,
-            &mut None,
-            &username,
-            "",
-            |_| false,
-        )) {
-            Err(e) => tracing::warn!(?e, "Client {} disconnected", index),
-            Ok(client) => break client,
-        }
-    };
-
     let mut clock = common::clock::Clock::new(Duration::from_secs_f32(1.0 / 30.0));
 
     let mut tick = |client: &mut Client| -> Result<(), veloren_client::Error> {
         clock.tick();
         client.tick_network(clock.dt())?;
+        client.cleanup();
         Ok(())
     };
 
+    let mut run = || -> Result<_, veloren_client::Error> {
+        // Connect to localhost
+        let addr = ConnectionArgs::Tcp {
+            prefer_ipv6: false,
+            hostname: "localhost".into(),
+        };
+        // NOTE: use a no-auth server
+        let mut client = pools.runtime.block_on(Client::new(
+                addr,
+                &mut None,
+                pools.clone(),
+                &username,
+                "",
+                |_| false,
+            ))?;
+        tracing::info!("Client {} connected", index);
+
         // Wait for character list to load
         client.load_character_list();
         while client.character_list().loading {
             tick(&mut client)?;
         }
+        tracing::info!("Client {} loaded character list", index);
 
         // Create character if none exist
         if client.character_list().characters.is_empty() {
@@ -156,6 +160,9 @@ fn run_client(
                 tick(&mut client)?;
             }
         }
+        tracing::info!("Client {} found or created character", index);
+
+        client.set_view_distance(opt.vd);
 
         // Select the first character
         client.request_character(
@@ -167,10 +174,6 @@ fn run_client(
                 .character
                 .id
                 .expect("Why is this an option?"),
-        common::ViewDistances {
-            terrain: opt.vd,
-            entity: opt.vd,
-        },
         );
 
         // If this is the admin client then adminify the other swarm members
@@ -203,10 +206,26 @@ fn run_client(
         while !client.is_moderator() {
             tick(&mut client)?;
         }
+        client.clear_terrain();
+        client.request_player_physics(false);
+
+        Ok(client)
+    };
+
+    let mut client = loop {
+        match run() {
+            Err(e) => tracing::warn!(?e, "Client {} disconnected", index),
+            Ok(client) => {
+                thread::sleep(Duration::from_secs(1));
+                break client
+            },
+        }
+    };
+    drop(pools);
 
     finished_init.fetch_add(1, Ordering::Relaxed);
     // Wait for initialization of all other swarm clients to finish
-    while !finished_init.load(Ordering::Relaxed) == opt.size {
+    while finished_init.load(Ordering::Relaxed) != opt.size {
         tick(&mut client)?;
     }
 

client/src/lib.rs

@@ -295,12 +295,11 @@ pub struct CharacterList {
 }
 
 /// Higher than what's needed at VD = 65.
-const TOTAL_PENDING_CHUNKS_LIMIT: usize = /*1024*/13800;
+const TOTAL_PENDING_CHUNKS_LIMIT: usize = /*1024*//*13800*/12;
 
 impl Client {
     pub async fn new(
         addr: ConnectionArgs,
-        runtime: Arc<Runtime>,
         // TODO: refactor to avoid needing to use this out parameter
         mismatched_server_info: &mut Option<ServerInfo>,
         pools: common_state::Pools,
@@ -308,7 +307,8 @@ impl Client {
         password: &str,
         auth_trusted: impl FnMut(&str) -> bool,
     ) -> Result<Self, Error> {
-        let network = Network::new(Pid::new(), &runtime);
+        let network = Network::new(Pid::new(), &pools.runtime);
+        let runtime = Arc::clone(&pools.runtime);
 
         let mut participant = match addr {
             ConnectionArgs::Tcp {
@@ -437,10 +437,6 @@ impl Client {
             *state.ecs_mut().write_resource() = PlayerEntity(Some(entity));
             state.ecs_mut().insert(material_stats);
             state.ecs_mut().insert(ability_map);
-            state
-                .ecs_mut()
-                .write_resource::<SlowJobPool>()
-                .configure(&"CHUNK_DROP", |_n| 1);
 
             let map_size = map_size_lg.chunks();
             let max_height = world_map.max_height;
@@ -2012,10 +2008,10 @@ impl Client {
                         } else {
                             drop(terrain);
                             if !skip_mode && !self.pending_chunks.contains_key(key) {
-                                const CURRENT_TICK_PENDING_CHUNKS_LIMIT: usize = 8 * 4;
+                                const CURRENT_TICK_PENDING_CHUNKS_LIMIT: usize = /*8 * 4*/2;
                                 if self.pending_chunks.len() < TOTAL_PENDING_CHUNKS_LIMIT
-                                    && /* current_tick_send_chunk_requests
+                                    && current_tick_send_chunk_requests
-                                        < CURRENT_TICK_PENDING_CHUNKS_LIMIT */true
+                                        < CURRENT_TICK_PENDING_CHUNKS_LIMIT
                                 {
                                     self.send_msg_err(ClientGeneral::TerrainChunkRequest {
                                         key: *key,

common/state/Cargo.toml

@@ -20,6 +20,7 @@ core_affinity = "0.5"
 rayon = "1.5"
 num_cpus = "1.0"
 thread-priority = { version = "0.9.2" }
+tokio = { version = "1.14", default-features = false, features = ["rt"] }
 tracing = { version = "0.1", default-features = false }
 vek = { version = "0.15.8", features = ["serde"] }
 

common/state/src/state.rs

@@ -37,7 +37,7 @@ use specs::{
     Component, DispatcherBuilder, Entity as EcsEntity, WorldExt,
 };
 use thread_priority::{ThreadBuilder, ThreadPriority};
-use std::{sync::Arc, time::Instant};
+use std::{sync::{atomic::{AtomicUsize, Ordering}, Arc}, time::Instant};
 use timer_queue::TimerQueue;
 use vek::*;
 
@@ -123,35 +123,50 @@ pub struct State {
     thread_pool: Arc<ThreadPool>,
 }
 
-pub type Pools = (usize, GameMode/*u64*/, Arc<ThreadPool>/*, slowjob::SlowJobPool*/);
+#[derive(Clone,Debug)]
+pub struct Pools {
+    pub slowjob_threads: usize,
+    game_mode: GameMode,
+    pub rayon_pool: Arc<ThreadPool>,
+    pub runtime: Arc<tokio::runtime::Runtime>,
+    /* slowjob: slowjob::SlowJobPool,*/
+}
 
 impl State {
-    pub fn pools(game_mode: GameMode) -> Pools {
+    pub fn pools(game_mode: GameMode, mut tokio_builder: tokio::runtime::Builder) -> Pools {
         let num_cpu = num_cpus::get()/* - 1*/;
 
-        let (thread_name_infix, rayon_offset) = match game_mode {
+        let (thread_name_infix, rayon_offset, tokio_count) = match game_mode {
             // The server does work on both the main thread and the rayon pool, but not at the same
             // time, so there's no reason to hold back a core from rayon.  It does effectively no
-            // other non-slowjob, non-rayon work that blocks the main thread.
+            // other non-slowjob, non-rayon work that blocks the main thread, but we do want to
-            GameMode::Server => ("s", 0),
+            // leave num_cpu / 4 cores available for tokio, since otherwise TCP buffers can build
+            // up to unreasonable degrees.
+            GameMode::Server => ("s", 0, num_cpu / 4),
             // The client does work on both the main thread and the rayon pool, but not at the same
             // time.  It does run some other non-slowjob and non-rayon threads, but none of them
-            // block work on the main thread.
+            // block work on the main thread.  It does not do enough networking for it to be worth
-            GameMode::Client => ("c", 0),
+            // dedicating anything to the tokio pool.
+            GameMode::Client => ("c", 0, 0),
             // Singleplayer does work on both the main thread and the rayon pool; unlike the server
             // and client cases, the rayon work may interfere with work on one of the main threads,
             // since the server and client don't coordinate their rayon work.  Therefore, we
             // reserve a core for the main thread(s) from both slowjob and rayon tasks.  Since many
             // CPUs can't afford to lose an entire core during the common periods when the server
             // and client are not interfering with each other, we still spawn an extra rayon thread
-            // in this case, but leave it floating so the OS can schedule it.
+            // in this case, but leave it floating so the OS can schedule it.  Of course,
-            GameMode::Singleplayer => ("sp", /*2*/1),
+            // singleplayer need not devote any resources to the tokio pool, as it's not expected
+            // to be in use.
+            GameMode::Singleplayer => ("sp", /*2*/1, 0),
         };
         let rayon_threads = /*match game_mode {
             GameMode::Server | GameMode::Client => num_cpu / 2,
             GameMode::Singleplayer => num_cpu / 4,
-        }*/num_cpu.max(common::consts::MIN_RECOMMENDED_RAYON_THREADS);
+        }*/num_cpu/*.saturating_sub(tokio_count)*/.max(common::consts::MIN_RECOMMENDED_RAYON_THREADS);
         let core_ids = /*(rayon_threads >= 16).then(|| */core_affinity::get_core_ids().unwrap_or(vec![])/*).unwrap_or(vec![])*/;
+        // Don't pin rayon threads to the cores expected to be used by tokio threads.
+        /* core_ids.truncate(core_ids.len() - tokio_count); */
+        let mut core_ids_ = core_ids.clone();
         let core_count = core_ids.len();
         let rayon_pool = Arc::new(
             ThreadPoolBuilder::new()
@@ -168,14 +183,14 @@ impl State {
                     }
                     // pinned rayon threads run with high priority
                     let index = thread.index();
-                    if index.checked_sub(rayon_offset).map_or(false, |i| i < core_count) {
+                    if index.checked_sub(rayon_offset + tokio_count).map_or(false, |i| i < core_count) {
                         b = b.priority(ThreadPriority::Max);
                     }
                     b.spawn_careless(|| thread.run())?;
                     Ok(())
                 })
                 .start_handler(move |i| {
-                    if let Some(&core_id) = i.checked_sub(rayon_offset).and_then(|i| core_ids.get(i)) {
+                    if let Some(&core_id) = i.checked_sub(rayon_offset + tokio_count).and_then(|i| core_ids_.get(i)) {
                         core_affinity::set_for_current(core_id);
                     }
                 })
@@ -200,9 +215,49 @@ impl State {
             /*Arc::clone(*/slow_pool/*)*/,
         ); */
 
+        // Setup tokio runtime
+        use tokio::runtime::Builder;
+
+        // TODO: evaluate std::thread::available_concurrency as a num_cpus replacement
+        let cores = num_cpus::get();
+        // We don't need that many threads in the async pool, at least 2 but generally
+        // 25% of all available will do
+        let mut core_ids_ = core_ids.clone();
+        let runtime = Arc::new(
+            tokio_builder
+                .enable_all()
+                .worker_threads(tokio_count.max(common::consts::MIN_RECOMMENDED_TOKIO_THREADS))
+                .thread_name_fn(move || {
+                    static ATOMIC_ID: AtomicUsize = AtomicUsize::new(0);
+                    let id = ATOMIC_ID.fetch_add(1, Ordering::SeqCst);
+                    format!("tokio-{}-{}", thread_name_infix, id)
+                })
+                .on_thread_start(move || {
+                    if tokio_count > 0 {
+                        static ATOMIC_ID: AtomicUsize = AtomicUsize::new(0);
+                        let index = ATOMIC_ID.fetch_add(1, Ordering::SeqCst) % tokio_count;
+                        if let Some(&core_id) = index.checked_add(num_cpu - tokio_count - 1).and_then(|i| core_ids_.get(i)) {
+                            core_affinity::set_for_current(core_id);
+                        }
+                    }
+                })
+                .build()
+                .unwrap(),
+        );
+
         // We always reserve at least one non-slowjob core, if possible, to make sure systems get a
-        // chance to run unobstructed.
+        // chance to run unobstructed.  We also leave any dedicated tokio threads their own
-        (num_cpu - 1/*slow_limit*//* as u64*/, game_mode, rayon_pool/*, slowjob*/)
+        // reserved cores, since networking is quite latency critical on a server.
+        //
+        // Note that for all n > 1, n - n / 4 - 1 > 0 (using integer arithmetic), which is fine
+        // since we require at least 2 hardware threads.
+        Pools {
+            slowjob_threads: num_cpu - tokio_count - 1/*slow_limit*//* as u64*/,
+            game_mode,
+            rayon_pool,
+            runtime,
+            /*slowjob,*/
+        }
     }
 
     /// Create a new `State` in client mode.
@@ -227,8 +282,8 @@ impl State {
             GameMode::Singleplayer => "sp",
         }; */
 
-        let num_cpu = /*num_cpus::get()*/pools.0/* / 2 + pools.0 / 4*/;
+        let num_cpu = /*num_cpus::get()*/pools.slowjob_threads/* / 2 + pools.0 / 4*/;
-        let game_mode = pools.1;
+        let game_mode = pools.game_mode;
         /* let rayon_threads = match game_mode {
             GameMode::Server | GameMode::Client => num_cpu/* / 2*/,
             GameMode::Singleplayer => num_cpu/* / 4*// 2,
@@ -280,7 +335,7 @@ impl State {
 
         Self {
             ecs: Self::setup_ecs_world(ecs_role, /*num_cpu as u64*//*, &thread_pool, *//*pools.1*/slowjob/*pools.3*/, map_size_lg, default_chunk),
-            thread_pool: pools.2,
+            thread_pool: pools.rayon_pool,
         }
     }
 

server-cli/src/main.rs

@@ -22,9 +22,8 @@ use crate::{
     tui_runner::Tui,
     tuilog::TuiLog,
 };
-use common::{clock::Clock, consts::MIN_RECOMMENDED_TOKIO_THREADS};
+use common::clock::Clock;
 use common_base::span;
-use core::sync::atomic::{AtomicUsize, Ordering};
 use server::{persistence::DatabaseSettings, settings::Protocol, Event, Input, Server};
 use std::{
     io,
@@ -75,20 +74,9 @@ fn main() -> io::Result<()> {
         path
     };
 
-    // We don't need that many threads in the async pool, at least 2 but generally
+    let pools = common_state::State::pools(
-    // 25% of all available will do
+        common::resources::GameMode::Server,
-    // TODO: evaluate std::thread::available_concurrency as a num_cpus replacement
+        tokio::runtime::Builder::new_multi_thread(),
-    let runtime = Arc::new(
-        tokio::runtime::Builder::new_multi_thread()
-            .enable_all()
-            .worker_threads((num_cpus::get() / 4).max(MIN_RECOMMENDED_TOKIO_THREADS))
-            .thread_name_fn(|| {
-                static ATOMIC_ID: AtomicUsize = AtomicUsize::new(0);
-                let id = ATOMIC_ID.fetch_add(1, Ordering::SeqCst);
-                format!("tokio-server-{}", id)
-            })
-            .build()
-            .unwrap(),
     );
 
     #[cfg(feature = "hot-agent")]
@@ -122,7 +110,7 @@ fn main() -> io::Result<()> {
             ArgvCommand::Shared(SharedCommand::Admin { command }) => {
                 let login_provider = server::login_provider::LoginProvider::new(
                     server_settings.auth_server_address,
-                    runtime,
+                    pools.runtime,
                 );
 
                 match command {
@@ -181,8 +169,7 @@ fn main() -> io::Result<()> {
         editable_settings,
         database_settings,
         &server_data_dir,
-        runtime,
+        pools,
-        common_state::State::pools(common::resources::GameMode::Server),
     )
     .expect("Failed to create server instance!");
 

server/src/lib.rs

@@ -217,7 +217,6 @@ impl Server {
         editable_settings: EditableSettings,
         database_settings: DatabaseSettings,
         data_dir: &std::path::Path,
-        runtime: Arc<Runtime>,
         pools: common_state::Pools,
     ) -> Result<Self, Error> {
         info!("Server data dir is: {}", data_dir.display());
@@ -262,13 +261,13 @@ impl Server {
                 },
                 calendar: Some(settings.calendar_mode.calendar_now()),
             },
-            &pools.2,
+            &pools.rayon_pool,
         );
         #[cfg(not(feature = "worldgen"))]
         let (world, index) = World::generate(settings.world_seed);
 
         #[cfg(feature = "worldgen")]
-        let map = world.get_map_data(index.as_index_ref(), &pools.2);
+        let map = world.get_map_data(index.as_index_ref(), &pools.rayon_pool);
         #[cfg(not(feature = "worldgen"))]
         let map = WorldMapMsg {
             dimensions_lg: Vec2::zero(),
@@ -281,6 +280,7 @@ impl Server {
             default_chunk: Arc::new(world.generate_oob_chunk()),
         };
 
+        let runtime = Arc::clone(&pools.runtime);
         let mut state = State::server(
             pools,
             world.sim().map_size_lg(),

voxygen/src/lib.rs

@@ -61,7 +61,6 @@ use i18n::LocalizationHandle;
 use std::path::PathBuf;
 
 use std::sync::Arc;
-use tokio::runtime::Runtime;
 
 /// A type used to store state that is shared between all play states.
 pub struct GlobalState {
@@ -70,7 +69,6 @@ pub struct GlobalState {
     pub settings: Settings,
     pub profile: Profile,
     pub window: Window,
-    pub tokio_runtime: Arc<Runtime>,
     #[cfg(feature = "egui-ui")]
     pub egui_state: EguiState,
     pub lazy_init: scene::terrain::SpriteRenderContextLazy,

voxygen/src/main.rs

@@ -95,29 +95,6 @@ fn main() {
     use clap::Parser;
     let args = cli::Args::parse();
 
-    // Setup tokio runtime
-    use common::consts::MIN_RECOMMENDED_TOKIO_THREADS;
-    use std::sync::{
-        atomic::{AtomicUsize, Ordering},
-        Arc,
-    };
-    use tokio::runtime::Builder;
-
-    // TODO: evaluate std::thread::available_concurrency as a num_cpus replacement
-    let cores = num_cpus::get();
-    let tokio_runtime = Arc::new(
-        Builder::new_multi_thread()
-            .enable_all()
-            .worker_threads((cores / 4).max(MIN_RECOMMENDED_TOKIO_THREADS))
-            .thread_name_fn(|| {
-                static ATOMIC_ID: AtomicUsize = AtomicUsize::new(0);
-                let id = ATOMIC_ID.fetch_add(1, Ordering::SeqCst);
-                format!("tokio-voxygen-{}", id)
-            })
-            .build()
-            .unwrap(),
-    );
-
     #[cfg(feature = "hot-reloading")]
     assets::start_hot_reloading();
 
@@ -167,7 +144,7 @@ fn main() {
 
     // Create window
     use veloren_voxygen::{error::Error, render::RenderError};
-    let (mut window, event_loop) = match Window::new(&settings, &tokio_runtime) {
+    let (mut window, event_loop) = match Window::new(&settings) {
         Ok(ok) => ok,
         // Custom panic message when a graphics backend could not be found
         Err(Error::RenderError(RenderError::CouldNotFindAdapter)) => {
@@ -211,7 +188,6 @@ fn main() {
         audio,
         profile,
         window,
-        tokio_runtime,
         #[cfg(feature = "egui-ui")]
         egui_state,
         lazy_init,

voxygen/src/menu/main/client_init.rs

@@ -11,7 +11,6 @@ use std::{
     },
     time::Duration,
 };
-use tokio::runtime;
 use tracing::{trace, warn};
 
 #[derive(Debug)]
@@ -47,7 +46,6 @@ impl ClientInit {
         connection_args: ConnectionArgs,
         username: String,
         password: String,
-        runtime: Arc<runtime::Runtime>,
         pools: common_state::Pools,
     ) -> Self {
         let (tx, rx) = unbounded();
@@ -55,9 +53,7 @@ impl ClientInit {
         let cancel = Arc::new(AtomicBool::new(false));
         let cancel2 = Arc::clone(&cancel);
 
-        let runtime2 = Arc::clone(&runtime);
+        pools.runtime.spawn(async move {
-
-        runtime.spawn(async move {
             let trust_fn = |auth_server: &str| {
                 let _ = tx.send(Msg::IsAuthTrusted(auth_server.to_string()));
                 trust_rx
@@ -76,7 +72,6 @@ impl ClientInit {
                 let mut mismatched_server_info = None;
                 match Client::new(
                     connection_args.clone(),
-                    Arc::clone(&runtime2),
                     &mut mismatched_server_info,
                     pools.clone(),
                     &username,
@@ -87,8 +82,7 @@ impl ClientInit {
                 {
                     Ok(client) => {
                         let _ = tx.send(Msg::Done(Ok(client)));
-                        drop(pools);
+                        tokio::task::block_in_place(move || drop(pools));
-                        tokio::task::block_in_place(move || drop(runtime2));
                         return;
                     },
                     Err(ClientError::NetworkErr(NetworkError::ConnectFailed(
@@ -112,9 +106,8 @@ impl ClientInit {
             // address and all the attempts timed out.
             let _ = tx.send(Msg::Done(Err(last_err.unwrap_or(Error::ServerNotFound))));
 
-            drop(pools);
             // Safe drop runtime
-            tokio::task::block_in_place(move || drop(runtime2));
+            tokio::task::block_in_place(move || drop(pools));
         });
 
         ClientInit {

voxygen/src/menu/main/mod.rs

@@ -22,7 +22,7 @@ use common_base::span;
 use i18n::LocalizationHandle;
 use scene::Scene;
 use std::sync::Arc;
-use tokio::runtime;
+use tokio::Builder;
 use tracing::error;
 use ui::{Event as MainMenuEvent, MainMenuUi};
 
@@ -107,7 +107,7 @@ impl PlayState for MainMenuState {
                             "".to_owned(),
                             ConnectionArgs::Mpsc(14004),
                             &mut self.init,
-                            &global_state.tokio_runtime,
+                            &pools.runtime,
                             &global_state.i18n,
                             Some(pools),
                         );
@@ -318,7 +318,6 @@ impl PlayState for MainMenuState {
                         password,
                         connection_args,
                         &mut self.init,
-                        &global_state.tokio_runtime,
                         &global_state.i18n,
                         None,
                     );
@@ -348,7 +347,8 @@ impl PlayState for MainMenuState {
                 },
                 #[cfg(feature = "singleplayer")]
                 MainMenuEvent::StartSingleplayer => {
-                    let singleplayer = Singleplayer::new(&global_state.tokio_runtime);
+
+                    let singleplayer = Singleplayer::new();
 
                     global_state.singleplayer = Some(singleplayer);
                 },
@@ -527,7 +527,6 @@ fn attempt_login(
     password: String,
     connection_args: ConnectionArgs,
     init: &mut InitState,
-    runtime: &Arc<runtime::Runtime>,
     localized_strings: &LocalizationHandle,
     pools: Option<common_state::Pools>,
 ) {
@@ -561,7 +560,12 @@ fn attempt_login(
             username,
             password,
             Arc::clone(runtime),
-            pools.unwrap_or_else(|| common_state::State::pools(common::resources::GameMode::Client)),
+            pools.unwrap_or_else(|| {
+                common_state::State::pools(
+                    common::resources::GameMode::Client,
+                    tokio::runtime::Builder::new_multi_thread(),
+                )
+            }),
         ));
     }
 }

voxygen/src/render/renderer.rs

@@ -199,7 +199,6 @@ impl Renderer {
     pub fn new(
         window: &winit::window::Window,
         mode: RenderMode,
-        runtime: &tokio::runtime::Runtime,
     ) -> Result<Self, RenderError> {
         let (pipeline_modes, mut other_modes) = mode.split();
         // Enable seamless cubemaps globally, where available--they are essentially a
@@ -313,6 +312,9 @@ impl Renderer {
             path
         });
 
+        let runtime = runtime::Builder::new_current_thread().build()
+            .expect("Failed to create single-threaded tokio runtime (for renderer initialization).");
+
         let (device, queue) = runtime.block_on(adapter.request_device(
             &wgpu::DeviceDescriptor {
                 // TODO

voxygen/src/singleplayer.rs

@@ -12,7 +12,6 @@ use std::{
     thread::{self, JoinHandle},
     time::Duration,
 };
-use tokio::runtime::Runtime;
 use tracing::{error, info, trace, warn};
 
 const TPS: u64 = 30;
@@ -30,7 +29,7 @@ pub struct Singleplayer {
 }
 
 impl Singleplayer {
-    pub fn new(runtime: &Arc<Runtime>) -> Self {
+    pub fn new() -> Self {
         let (stop_server_s, stop_server_r) = unbounded();
 
         // Determine folder to save server data in
@@ -100,18 +99,19 @@ impl Singleplayer {
         let (result_sender, result_receiver) = bounded(1);
 
         let builder = thread::Builder::new().name("singleplayer-server-thread".into());
-        let runtime = Arc::clone(runtime);
         let thread = builder
             .spawn(move || {
                 trace!("starting singleplayer server thread");
 
-                let pools = common_state::State::pools(common::resources::GameMode::Singleplayer);
+                let pools = common_state::State::pools(
+                    common::resources::GameMode::Singleplayer,
+                    tokio::runtime::Builder::new_multi_thread(),
+                );
                 let (server, init_result) = match Server::new(
                     settings2,
                     editable_settings,
                     database_settings,
                     &server_data_dir,
-                    runtime,
                     pools.clone(),
                 ) {
                     Ok(server) => (Some(server), Ok(pools)),

voxygen/src/window.rs

@@ -411,10 +411,7 @@ pub struct Window {
 }
 
 impl Window {
-    pub fn new(
+    pub fn new(settings: &Settings) -> Result<(Window, EventLoop), Error> {
-        settings: &Settings,
-        runtime: &tokio::runtime::Runtime,
-    ) -> Result<(Window, EventLoop), Error> {
         let event_loop = EventLoop::new();
 
         let size = settings.graphics.window_size;
@@ -434,7 +431,7 @@ impl Window {
 
         let window = win_builder.build(&event_loop).unwrap();
 
-        let renderer = Renderer::new(&window, settings.graphics.render_mode.clone(), runtime)?;
+        let renderer = Renderer::new(&window, settings.graphics.render_mode.clone())?;
 
         let keypress_map = HashMap::new();