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Use EMA to compute QUIC streamer load for staked connections (#34586) 

* Use EMA to compute QUIC streamer load for staked connections

* change min load to 25% of max load

* reduce max PPS from 500K to 250K

* update ema_function to account for missing intervals

* replace f64 math with u128

* track streams across all connections for a peer

* u128  -> u64

* replace ' as ' type conversion to from and try_from

* add counter for u64 overflow

* reset recent stream load on ema interval

* do not use same counter for unstaked connections from a peer IP
This commit is contained in:
Pankaj Garg 2024-01-11 10:05:38 -08:00 committed by GitHub
parent e31a45ad0c
commit 904700cc56
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2 changed files with 479 additions and 60 deletions
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521
streamer/src/nonblocking/quic.rs
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@ -28,6 +28,7 @@ use {
timing,
},
std::{
cmp,
iter::repeat_with,
net::{IpAddr, SocketAddr, UdpSocket},
sync::{
@ -39,10 +40,10 @@ use {
tokio::{task::JoinHandle, time::timeout},
};
/// Limit to 500K PPS
const MAX_STREAMS_PER_100MS: u64 = 500_000 / 10;
/// Limit to 250K PPS
const MAX_STREAMS_PER_MS: u64 = 250;
const MAX_UNSTAKED_STREAMS_PERCENT: u64 = 20;
const STREAM_THROTTLING_INTERVAL: Duration = Duration::from_millis(100);
const STREAM_THROTTLING_INTERVAL_MS: u64 = 100;
const WAIT_FOR_STREAM_TIMEOUT: Duration = Duration::from_millis(100);
pub const DEFAULT_WAIT_FOR_CHUNK_TIMEOUT: Duration = Duration::from_secs(10);
@ -60,6 +61,9 @@ const CONNECTION_CLOSE_REASON_EXCEED_MAX_STREAM_COUNT: &[u8] = b"exceed_max_stre
const CONNECTION_CLOSE_CODE_TOO_MANY: u32 = 4;
const CONNECTION_CLOSE_REASON_TOO_MANY: &[u8] = b"too_many";
const STREAM_STOP_CODE_THROTTLING: u32 = 15;
const STREAM_LOAD_EMA_INTERVAL_MS: u64 = 5;
const STREAM_LOAD_EMA_INTERVAL_COUNT: u64 = 10;
const MIN_STREAMS_PER_THROTTLING_INTERVAL_FOR_STAKED_CONNECTION: u64 = 8;
// A sequence of bytes that is part of a packet
// along with where in the packet it is
@ -85,6 +89,138 @@ struct PacketAccumulator {
pub chunks: Vec<PacketChunk>,
}
struct StakedStreamLoadEMA {
current_load_ema: AtomicU64,
load_in_recent_interval: AtomicU64,
last_update: RwLock<Instant>,
stats: Arc<StreamStats>,
}
impl StakedStreamLoadEMA {
fn new(stats: Arc<StreamStats>) -> Self {
Self {
current_load_ema: AtomicU64::default(),
load_in_recent_interval: AtomicU64::default(),
last_update: RwLock::new(Instant::now()),
stats,
}
}
fn ema_function(current_ema: u128, recent_load: u128) -> u128 {
// Using the EMA multiplier helps in avoiding the floating point math during EMA related calculations
const STREAM_LOAD_EMA_MULTIPLIER: u128 = 1024;
let multiplied_smoothing_factor: u128 =
2 * STREAM_LOAD_EMA_MULTIPLIER / (u128::from(STREAM_LOAD_EMA_INTERVAL_COUNT) + 1);
// The formula is
// updated_ema = recent_load * smoothing_factor + current_ema * (1 - smoothing_factor)
// To avoid floating point math, we are using STREAM_LOAD_EMA_MULTIPLIER
// updated_ema = (recent_load * multiplied_smoothing_factor
// + current_ema * (multiplier - multiplied_smoothing_factor)) / multiplier
(recent_load * multiplied_smoothing_factor
+ current_ema * (STREAM_LOAD_EMA_MULTIPLIER - multiplied_smoothing_factor))
/ STREAM_LOAD_EMA_MULTIPLIER
}
fn update_ema(&self, time_since_last_update_ms: u128) {
// if time_since_last_update_ms > STREAM_LOAD_EMA_INTERVAL_MS, there might be intervals where ema was not updated.
// count how many updates (1 + missed intervals) are needed.
let num_extra_updates =
time_since_last_update_ms.saturating_sub(1) / u128::from(STREAM_LOAD_EMA_INTERVAL_MS);
let load_in_recent_interval =
u128::from(self.load_in_recent_interval.swap(0, Ordering::Relaxed));
let mut updated_load_ema = Self::ema_function(
u128::from(self.current_load_ema.load(Ordering::Relaxed)),
load_in_recent_interval,
);
for _ in 0..num_extra_updates {
updated_load_ema = Self::ema_function(updated_load_ema, load_in_recent_interval);
}
let Ok(updated_load_ema) = u64::try_from(updated_load_ema) else {
error!(
"Failed to convert EMA {} to a u64. Not updating the load EMA",
updated_load_ema
);
self.stats
.stream_load_ema_overflow
.fetch_add(1, Ordering::Relaxed);
return;
};
self.current_load_ema
.store(updated_load_ema, Ordering::Relaxed);
self.stats
.stream_load_ema
.store(updated_load_ema as usize, Ordering::Relaxed);
}
fn update_ema_if_needed(&self) {
const EMA_DURATION: Duration = Duration::from_millis(STREAM_LOAD_EMA_INTERVAL_MS);
// Read lock enables multiple connection handlers to run in parallel if interval is not expired
if Instant::now().duration_since(*self.last_update.read().unwrap()) >= EMA_DURATION {
let mut last_update_w = self.last_update.write().unwrap();
// Recheck as some other thread might have updated the ema since this thread tried to acquire the write lock.
let since_last_update = Instant::now().duration_since(*last_update_w);
if since_last_update >= EMA_DURATION {
*last_update_w = Instant::now();
self.update_ema(since_last_update.as_millis());
}
}
}
fn increment_load(&self) {
self.load_in_recent_interval.fetch_add(1, Ordering::Relaxed);
self.update_ema_if_needed();
}
fn available_load_capacity_in_duration(
&self,
stake: u64,
total_stake: u64,
duration_ms: u64,
) -> u64 {
let ema_window_ms = STREAM_LOAD_EMA_INTERVAL_MS * STREAM_LOAD_EMA_INTERVAL_COUNT;
let max_load_in_ema_window = u128::from(
(MAX_STREAMS_PER_MS
- Percentage::from(MAX_UNSTAKED_STREAMS_PERCENT).apply_to(MAX_STREAMS_PER_MS))
* ema_window_ms,
);
// If the current load is low, cap it to 25% of max_load.
let current_load = cmp::max(
u128::from(self.current_load_ema.load(Ordering::Relaxed)),
max_load_in_ema_window / 4,
);
// Formula is (max_load ^ 2 / current_load) * (stake / total_stake)
let capacity_in_ema_window =
(max_load_in_ema_window * max_load_in_ema_window * u128::from(stake))
/ (current_load * u128::from(total_stake));
let calculated_capacity =
capacity_in_ema_window * u128::from(duration_ms) / u128::from(ema_window_ms);
let calculated_capacity = u64::try_from(calculated_capacity).unwrap_or_else(|_| {
error!(
"Failed to convert stream capacity {} to u64. Using minimum load capacity",
calculated_capacity
);
self.stats
.stream_load_capacity_overflow
.fetch_add(1, Ordering::Relaxed);
MIN_STREAMS_PER_THROTTLING_INTERVAL_FOR_STAKED_CONNECTION
});
cmp::max(
calculated_capacity,
MIN_STREAMS_PER_THROTTLING_INTERVAL_FOR_STAKED_CONNECTION,
)
}
}
#[allow(clippy::too_many_arguments)]
pub fn spawn_server(
name: &'static str,
@ -147,6 +283,7 @@ async fn run_server(
let unstaked_connection_table: Arc<Mutex<ConnectionTable>> = Arc::new(Mutex::new(
ConnectionTable::new(ConnectionPeerType::Unstaked),
));
let stream_load_ema = Arc::new(StakedStreamLoadEMA::new(stats.clone()));
let staked_connection_table: Arc<Mutex<ConnectionTable>> =
Arc::new(Mutex::new(ConnectionTable::new(ConnectionPeerType::Staked)));
let (sender, receiver) = async_unbounded();
@ -178,6 +315,7 @@ async fn run_server(
max_unstaked_connections,
stats.clone(),
wait_for_chunk_timeout,
stream_load_ema.clone(),
));
} else {
debug!("accept(): Timed out waiting for connection");
@ -311,6 +449,7 @@ fn handle_and_cache_new_connection(
connection_table: Arc<Mutex<ConnectionTable>>,
params: &NewConnectionHandlerParams,
wait_for_chunk_timeout: Duration,
stream_load_ema: Arc<StakedStreamLoadEMA>,
) -> Result<(), ConnectionHandlerError> {
if let Ok(max_uni_streams) = VarInt::from_u64(compute_max_allowed_uni_streams(
connection_table_l.peer_type,
@ -342,14 +481,16 @@ fn handle_and_cache_new_connection(
remote_addr,
);
if let Some((last_update, stream_exit)) = connection_table_l.try_add_connection(
ConnectionTableKey::new(remote_addr.ip(), params.remote_pubkey),
remote_addr.port(),
Some(connection.clone()),
params.stake,
timing::timestamp(),
params.max_connections_per_peer,
) {
if let Some((last_update, stream_exit, stream_counter)) = connection_table_l
.try_add_connection(
ConnectionTableKey::new(remote_addr.ip(), params.remote_pubkey),
remote_addr.port(),
Some(connection.clone()),
params.stake,
timing::timestamp(),
params.max_connections_per_peer,
)
{
let peer_type = connection_table_l.peer_type;
drop(connection_table_l);
tokio::spawn(handle_connection(
@ -361,6 +502,8 @@ fn handle_and_cache_new_connection(
params.clone(),
peer_type,
wait_for_chunk_timeout,
stream_load_ema,
stream_counter,
));
Ok(())
} else {
@ -389,6 +532,7 @@ fn prune_unstaked_connections_and_add_new_connection(
max_connections: usize,
params: &NewConnectionHandlerParams,
wait_for_chunk_timeout: Duration,
stream_load_ema: Arc<StakedStreamLoadEMA>,
) -> Result<(), ConnectionHandlerError> {
let stats = params.stats.clone();
if max_connections > 0 {
@ -401,6 +545,7 @@ fn prune_unstaked_connections_and_add_new_connection(
connection_table_clone,
params,
wait_for_chunk_timeout,
stream_load_ema,
)
} else {
connection.close(
@ -467,6 +612,7 @@ async fn setup_connection(
max_unstaked_connections: usize,
stats: Arc<StreamStats>,
wait_for_chunk_timeout: Duration,
stream_load_ema: Arc<StakedStreamLoadEMA>,
) {
const PRUNE_RANDOM_SAMPLE_SIZE: usize = 2;
let from = connecting.remote_address();
@ -510,6 +656,7 @@ async fn setup_connection(
staked_connection_table.clone(),
&params,
wait_for_chunk_timeout,
stream_load_ema.clone(),
) {
stats
.connection_added_from_staked_peer
@ -525,6 +672,7 @@ async fn setup_connection(
max_unstaked_connections,
&params,
wait_for_chunk_timeout,
stream_load_ema.clone(),
) {
stats
.connection_added_from_staked_peer
@ -544,6 +692,7 @@ async fn setup_connection(
max_unstaked_connections,
&params,
wait_for_chunk_timeout,
stream_load_ema.clone(),
) {
stats
.connection_added_from_unstaked_peer
@ -685,31 +834,30 @@ async fn packet_batch_sender(
}
}
fn max_streams_for_connection_in_100ms(
fn max_streams_for_connection_in_duration(
connection_type: ConnectionPeerType,
stake: u64,
total_stake: u64,
ema_load: Arc<StakedStreamLoadEMA>,
duration_ms: u64,
) -> u64 {
if matches!(connection_type, ConnectionPeerType::Unstaked) || stake == 0 {
let max_num_connections = u64::try_from(MAX_UNSTAKED_CONNECTIONS).unwrap_or_else(|_| {
error!(
"Failed to convert maximum number of unstaked connections {} to u64.",
MAX_UNSTAKED_CONNECTIONS
);
500
});
Percentage::from(MAX_UNSTAKED_STREAMS_PERCENT)
.apply_to(MAX_STREAMS_PER_100MS)
.saturating_div(MAX_UNSTAKED_CONNECTIONS as u64)
.apply_to(MAX_STREAMS_PER_MS * duration_ms)
.saturating_div(max_num_connections)
} else {
let max_total_staked_streams: u64 = MAX_STREAMS_PER_100MS
- Percentage::from(MAX_UNSTAKED_STREAMS_PERCENT).apply_to(MAX_STREAMS_PER_100MS);
((max_total_staked_streams as f64 / total_stake as f64) * stake as f64) as u64
}
}
fn reset_throttling_params_if_needed(last_instant: &mut tokio::time::Instant) -> bool {
if tokio::time::Instant::now().duration_since(*last_instant) > STREAM_THROTTLING_INTERVAL {
*last_instant = tokio::time::Instant::now();
true
} else {
false
ema_load.available_load_capacity_in_duration(stake, total_stake, duration_ms)
}
}
#[allow(clippy::too_many_arguments)]
async fn handle_connection(
connection: Connection,
remote_addr: SocketAddr,
@ -719,6 +867,8 @@ async fn handle_connection(
params: NewConnectionHandlerParams,
peer_type: ConnectionPeerType,
wait_for_chunk_timeout: Duration,
stream_load_ema: Arc<StakedStreamLoadEMA>,
stream_counter: Arc<ConnectionStreamCounter>,
) {
let stats = params.stats;
debug!(
@ -729,30 +879,48 @@ async fn handle_connection(
);
let stable_id = connection.stable_id();
stats.total_connections.fetch_add(1, Ordering::Relaxed);
let max_streams_per_100ms =
max_streams_for_connection_in_100ms(peer_type, params.stake, params.total_stake);
let mut last_throttling_instant = tokio::time::Instant::now();
let mut streams_in_current_interval = 0;
let mut max_streams_per_throttling_interval = max_streams_for_connection_in_duration(
peer_type,
params.stake,
params.total_stake,
stream_load_ema.clone(),
STREAM_THROTTLING_INTERVAL_MS,
);
let staked_stream = matches!(peer_type, ConnectionPeerType::Staked) && params.stake > 0;
while !stream_exit.load(Ordering::Relaxed) {
if let Ok(stream) =
tokio::time::timeout(WAIT_FOR_STREAM_TIMEOUT, connection.accept_uni()).await
{
match stream {
Ok(mut stream) => {
if reset_throttling_params_if_needed(&mut last_throttling_instant) {
streams_in_current_interval = 0;
} else if streams_in_current_interval >= max_streams_per_100ms {
if staked_stream {
max_streams_per_throttling_interval = stream_load_ema
.available_load_capacity_in_duration(
params.stake,
params.total_stake,
STREAM_THROTTLING_INTERVAL_MS,
);
}
stream_counter.reset_throttling_params_if_needed();
if stream_counter.stream_count.load(Ordering::Relaxed)
>= max_streams_per_throttling_interval
{
stats.throttled_streams.fetch_add(1, Ordering::Relaxed);
let _ = stream.stop(VarInt::from_u32(STREAM_STOP_CODE_THROTTLING));
continue;
}
streams_in_current_interval = streams_in_current_interval.saturating_add(1);
if staked_stream {
stream_load_ema.increment_load();
}
stream_counter.stream_count.fetch_add(1, Ordering::Relaxed);
stats.total_streams.fetch_add(1, Ordering::Relaxed);
stats.total_new_streams.fetch_add(1, Ordering::Relaxed);
let stream_exit = stream_exit.clone();
let stats = stats.clone();
let packet_sender = params.packet_sender.clone();
let last_update = last_update.clone();
let stream_load_ema = stream_load_ema.clone();
tokio::spawn(async move {
let mut maybe_batch = None;
// The min is to guard against a value too small which can wake up unnecessarily
@ -793,6 +961,9 @@ async fn handle_connection(
}
}
stats.total_streams.fetch_sub(1, Ordering::Relaxed);
if staked_stream {
stream_load_ema.update_ema_if_needed();
}
});
}
Err(e) => {
@ -931,6 +1102,37 @@ async fn handle_chunk(
false
}
#[derive(Debug)]
struct ConnectionStreamCounter {
stream_count: AtomicU64,
last_throttling_instant: RwLock<tokio::time::Instant>,
}
impl ConnectionStreamCounter {
fn new() -> Self {
Self {
stream_count: AtomicU64::default(),
last_throttling_instant: RwLock::new(tokio::time::Instant::now()),
}
}
fn reset_throttling_params_if_needed(&self) {
const THROTTLING_INTERVAL: Duration = Duration::from_millis(STREAM_THROTTLING_INTERVAL_MS);
if tokio::time::Instant::now().duration_since(*self.last_throttling_instant.read().unwrap())
> THROTTLING_INTERVAL
{
let mut last_throttling_instant = self.last_throttling_instant.write().unwrap();
// Recheck as some other thread might have done throttling since this thread tried to acquire the write lock.
if tokio::time::Instant::now().duration_since(*last_throttling_instant)
> THROTTLING_INTERVAL
{
*last_throttling_instant = tokio::time::Instant::now();
self.stream_count.store(0, Ordering::Relaxed);
}
}
}
}
#[derive(Debug)]
struct ConnectionEntry {
exit: Arc<AtomicBool>,
@ -938,6 +1140,7 @@ struct ConnectionEntry {
last_update: Arc<AtomicU64>,
port: u16,
connection: Option<Connection>,
stream_counter: Arc<ConnectionStreamCounter>,
}
impl ConnectionEntry {
@ -947,6 +1150,7 @@ impl ConnectionEntry {
last_update: Arc<AtomicU64>,
port: u16,
connection: Option<Connection>,
stream_counter: Arc<ConnectionStreamCounter>,
) -> Self {
Self {
exit,
@ -954,6 +1158,7 @@ impl ConnectionEntry {
last_update,
port,
connection,
stream_counter,
}
}
@ -1064,7 +1269,11 @@ impl ConnectionTable {
stake: u64,
last_update: u64,
max_connections_per_peer: usize,
) -> Option<(Arc<AtomicU64>, Arc<AtomicBool>)> {
) -> Option<(
Arc<AtomicU64>,
Arc<AtomicBool>,
Arc<ConnectionStreamCounter>,
)> {
let connection_entry = self.table.entry(key).or_default();
let has_connection_capacity = connection_entry
.len()
@ -1074,15 +1283,26 @@ impl ConnectionTable {
if has_connection_capacity {
let exit = Arc::new(AtomicBool::new(false));
let last_update = Arc::new(AtomicU64::new(last_update));
let stream_counter = if stake > 0 {
connection_entry
.first()
.map(|entry| entry.stream_counter.clone())
.unwrap_or(Arc::new(ConnectionStreamCounter::new()))
} else {
// Unstaked connections are tracked using peer IP address. It's possible that different clients
// use the same IP due to NAT. So counting all the streams from a given IP could be too restrictive.
Arc::new(ConnectionStreamCounter::new())
};
connection_entry.push(ConnectionEntry::new(
exit.clone(),
stake,
last_update.clone(),
port,
connection,
stream_counter.clone(),
));
self.total_size += 1;
Some((last_update, exit))
Some((last_update, exit, stream_counter))
} else {
if let Some(connection) = connection {
connection.close(
@ -2030,38 +2250,219 @@ pub mod test {
}
#[test]
fn test_max_streams_for_connection_in_100ms() {
// 50K packets per ms * 20% / 500 max unstaked connections
fn test_max_streams_for_unstaked_connection_in_100ms() {
let load_ema = Arc::new(StakedStreamLoadEMA::new(Arc::new(StreamStats::default())));
// 25K packets per ms * 20% / 500 max unstaked connections
assert_eq!(
max_streams_for_connection_in_100ms(ConnectionPeerType::Unstaked, 0, 10000),
20
max_streams_for_connection_in_duration(
ConnectionPeerType::Unstaked,
0,
10000,
load_ema.clone(),
100
),
10
);
// 50K packets per ms * 20% / 500 max unstaked connections
// 25K packets per ms * 20% / 500 max unstaked connections
assert_eq!(
max_streams_for_connection_in_100ms(ConnectionPeerType::Unstaked, 10, 10000),
20
max_streams_for_connection_in_duration(
ConnectionPeerType::Unstaked,
10,
10000,
load_ema.clone(),
100
),
10
);
// If stake is 0, same limits as unstaked connections will apply.
// 50K packets per ms * 20% / 500 max unstaked connections
// 25K packets per ms * 20% / 500 max unstaked connections
assert_eq!(
max_streams_for_connection_in_100ms(ConnectionPeerType::Staked, 0, 10000),
20
);
// max staked streams = 50K packets per ms * 80% = 40K
// function = 40K * stake / total_stake
assert_eq!(
max_streams_for_connection_in_100ms(ConnectionPeerType::Staked, 15, 10000),
60
);
// max staked streams = 50K packets per ms * 80% = 40K
// function = 40K * stake / total_stake
assert_eq!(
max_streams_for_connection_in_100ms(ConnectionPeerType::Staked, 1000, 10000),
4000
max_streams_for_connection_in_duration(
ConnectionPeerType::Staked,
0,
10000,
load_ema.clone(),
100
),
10
);
}
#[test]
fn test_max_streams_for_staked_connection_in_100ms() {
let load_ema = Arc::new(StakedStreamLoadEMA::new(Arc::new(StreamStats::default())));
// EMA load is used for staked connections to calculate max number of allowed streams.
// EMA window = 5ms interval * 10 intervals = 50ms
// max streams per window = 250K streams/sec * 80% = 200K/sec = 10K per 50ms
// max_streams in 50ms = ((10K * 10K) / ema_load) * stake / total_stake
//
// Stream throttling window is 100ms. So it'll double the amount of max streams.
// max_streams in 100ms (throttling window) = 2 * ((10K * 10K) / ema_load) * stake / total_stake
load_ema.current_load_ema.store(10000, Ordering::Relaxed);
// ema_load = 10K, stake = 15, total_stake = 10K
// max_streams in 100ms (throttling window) = 2 * ((10K * 10K) / 10K) * 15 / 10K = 30
assert_eq!(
max_streams_for_connection_in_duration(
ConnectionPeerType::Staked,
15,
10000,
load_ema.clone(),
100
),
30
);
// ema_load = 10K, stake = 1K, total_stake = 10K
// max_streams in 100ms (throttling window) = 2 * ((10K * 10K) / 10K) * 1K / 10K = 2K
assert_eq!(
max_streams_for_connection_in_duration(
ConnectionPeerType::Staked,
1000,
10000,
load_ema.clone(),
100
),
2000
);
load_ema.current_load_ema.store(2500, Ordering::Relaxed);
// ema_load = 2.5K, stake = 15, total_stake = 10K
// max_streams in 100ms (throttling window) = 2 * ((10K * 10K) / 2.5K) * 15 / 10K = 120
assert_eq!(
max_streams_for_connection_in_duration(
ConnectionPeerType::Staked,
15,
10000,
load_ema.clone(),
100
),
120
);
// ema_load = 2.5K, stake = 1K, total_stake = 10K
// max_streams in 100ms (throttling window) = 2 * ((10K * 10K) / 2.5K) * 1K / 10K = 8000
assert_eq!(
max_streams_for_connection_in_duration(
ConnectionPeerType::Staked,
1000,
10000,
load_ema.clone(),
100
),
8000
);
// At 2000, the load is less than 25% of max_load (10K).
// Test that we cap it to 25%, yielding the same result as if load was 2500.
load_ema.current_load_ema.store(2000, Ordering::Relaxed);
// function = ((10K * 10K) / 25% of 10K) * stake / total_stake
assert_eq!(
max_streams_for_connection_in_duration(
ConnectionPeerType::Staked,
15,
10000,
load_ema.clone(),
100
),
120
);
// function = ((10K * 10K) / 25% of 10K) * stake / total_stake
assert_eq!(
max_streams_for_connection_in_duration(
ConnectionPeerType::Staked,
1000,
10000,
load_ema.clone(),
100
),
8000
);
// At 1/40000 stake weight, and minimum load, it should still allow
// MIN_STREAMS_PER_THROTTLING_INTERVAL_FOR_STAKED_CONNECTION of streams.
assert_eq!(
max_streams_for_connection_in_duration(
ConnectionPeerType::Staked,
1,
40000,
load_ema.clone(),
100
),
MIN_STREAMS_PER_THROTTLING_INTERVAL_FOR_STAKED_CONNECTION
);
}
#[test]
fn test_update_ema() {
let stream_load_ema = Arc::new(StakedStreamLoadEMA::new(Arc::new(StreamStats::default())));
stream_load_ema
.load_in_recent_interval
.store(2500, Ordering::Relaxed);
stream_load_ema
.current_load_ema
.store(2000, Ordering::Relaxed);
stream_load_ema.update_ema(5);
let updated_ema = stream_load_ema.current_load_ema.load(Ordering::Relaxed);
assert_eq!(updated_ema, 2090);
stream_load_ema
.load_in_recent_interval
.store(2500, Ordering::Relaxed);
stream_load_ema.update_ema(5);
let updated_ema = stream_load_ema.current_load_ema.load(Ordering::Relaxed);
assert_eq!(updated_ema, 2164);
}
#[test]
fn test_update_ema_missing_interval() {
let stream_load_ema = Arc::new(StakedStreamLoadEMA::new(Arc::new(StreamStats::default())));
stream_load_ema
.load_in_recent_interval
.store(2500, Ordering::Relaxed);
stream_load_ema
.current_load_ema
.store(2000, Ordering::Relaxed);
stream_load_ema.update_ema(8);
let updated_ema = stream_load_ema.current_load_ema.load(Ordering::Relaxed);
assert_eq!(updated_ema, 2164);
}
#[test]
fn test_update_ema_if_needed() {
let stream_load_ema = Arc::new(StakedStreamLoadEMA::new(Arc::new(StreamStats::default())));
stream_load_ema
.load_in_recent_interval
.store(2500, Ordering::Relaxed);
stream_load_ema
.current_load_ema
.store(2000, Ordering::Relaxed);
stream_load_ema.update_ema_if_needed();
let updated_ema = stream_load_ema.current_load_ema.load(Ordering::Relaxed);
assert_eq!(updated_ema, 2000);
let ema_interval = Duration::from_millis(STREAM_LOAD_EMA_INTERVAL_MS);
*stream_load_ema.last_update.write().unwrap() =
Instant::now().checked_sub(ema_interval).unwrap();
stream_load_ema.update_ema_if_needed();
assert!(
Instant::now().duration_since(*stream_load_ema.last_update.read().unwrap())
< ema_interval
);
let updated_ema = stream_load_ema.current_load_ema.load(Ordering::Relaxed);
assert_eq!(updated_ema, 2090);
}
}

18
streamer/src/quic.rs
View File

@ -176,6 +176,9 @@ pub struct StreamStats {
pub(crate) connection_removed: AtomicUsize,
pub(crate) connection_remove_failed: AtomicUsize,
pub(crate) throttled_streams: AtomicUsize,
pub(crate) stream_load_ema: AtomicUsize,
pub(crate) stream_load_ema_overflow: AtomicUsize,
pub(crate) stream_load_capacity_overflow: AtomicUsize,
}
impl StreamStats {
@ -411,6 +414,21 @@ impl StreamStats {
self.throttled_streams.swap(0, Ordering::Relaxed),
i64
),
(
"stream_load_ema",
self.stream_load_ema.load(Ordering::Relaxed),
i64
),
(
"stream_load_ema_overflow",
self.stream_load_ema_overflow.load(Ordering::Relaxed),
i64
),
(
"stream_load_capacity_overflow",
self.stream_load_capacity_overflow.load(Ordering::Relaxed),
i64
),
);
}
}