Idle tracking in gate way #1

RuiyuZhu · 2023-07-13T20:17:41Z

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akoshelev · 2023-07-14T05:34:49Z

This is getting in the right direction. I would also like to see if we can make this functionality enabled only in debug builds (behind debug_assertions cfg flag)

akoshelev · 2023-07-14T05:18:00Z

src/helpers/buffers/ordering_sender.rs

@@ -40,6 +40,8 @@ struct State {
 write_ready: Option<Waker>,
 /// Another entity to wake when the buffer is read from.
 stream_ready: Option<Waker>,
+ /// record whether the sender is idle recently
+ idle: bool,


it is possible to generalize this by leveraging Rust's trait system

trait Observable { fn is_changed(&self) -> bool; } impl <K: Hash + Eq, V> Observable for DashMap<K, Watcher<V>> { fn is_changed(&self) -> bool { self.iter().any(|v| v.is_touched()) } } /// Tracks whenever someone accesses `T` by a shared reference. If it happens, sets `accessed` to /// `true` until someone calls `is_touched`. struct Watcher<T> { inner: T, touched: Arc<AtomicBool>, } impl <T> Watcher<T> { fn watch(inner: T) -> Self { Self { inner, touched: Arc::new(AtomicBool::new(true)), } } fn is_touched(&self) -> bool { self.touched.swap(false, Ordering::Relaxed) } } impl <T> Deref for Watcher<T> { type Target = T; fn deref(&self) -> &Self::Target { self.touched.fetch_or(true, Ordering::Relaxed); &self.inner } } impl <T: Default> Default for Watcher<T> { fn default() -> Self { Self::watch(T::default()) } } impl <T: Clone> Clone for Watcher<T> { fn clone(&self) -> Self { Self { inner: T::clone(&self.inner), touched: self.touched.clone(), } } }

then you just implement it for senders and receivers

impl Observable for Watcher<GatewaySenders> { fn is_changed(&self) -> bool { self.is_touched() || self.inner.inner.is_changed() } }

Note that Deref allows us to track when someone calls get_channel or send/receive on that channel, but not the future poll like you implemented. However I think that may be enough because send and receive operations are cheap and happen many times per report/step.

akoshelev · 2023-07-14T05:18:42Z

src/helpers/buffers/ordering_sender.rs

+ self.idle
+ }
+
+ fn reset_idle(&mut self) {


there is only one client for this API, so is_idle can just reset the flag

Good point!

akoshelev · 2023-07-14T05:22:26Z

src/helpers/gateway/mod.rs

@@ -40,8 +40,9 @@ pub type ReceivingEnd<M> = ReceivingEndBase<TransportImpl, M>;
 pub struct Gateway<T: Transport = TransportImpl> {
 config: GatewayConfig,
 transport: RoleResolvingTransport<T>,
- senders: GatewaySenders,
- receivers: GatewayReceivers<T>,
+ senders: Arc<Mutex<GatewaySenders>>,


both GatewaySenders and GatewayReceivers are Send + Sync, so they don't need to be protected by a mutex. You could just slap #derive(Clone) on them

Got it. That's much more elegant.

akoshelev · 2023-07-14T05:22:41Z

src/helpers/gateway/mod.rs

+ let senders_clone = Arc::clone(&senders);
+ let receivers = Arc::new(Mutex::new( GatewayReceivers::default()));
+ let receivers_clone = Arc::clone(&receivers);
+ thread::spawn(move|| {


any reason for spawning a thread instead of a tokio task?

akoshelev · 2023-07-14T05:23:37Z

src/helpers/gateway/mod.rs

+ thread::spawn(move|| {
+ // Perform some periodic work in the background
+ loop {
+ thread::sleep(Duration::from_secs(1));


given that it is for debug purposes, timeout could be higher to avoid false positives (5-10 secs)

akoshelev · 2023-07-14T05:24:56Z

src/helpers/gateway/mod.rs

+ senders.reset_idle();
+ receivers.reset_idle();
+ }
+ match rx.try_recv()


we should just keep the handle returned by spawn method inside the gateway. In this case we don't need a sender to terminate it, we just call abort inside Drop

sounds good

akoshelev · 2023-07-14T05:33:47Z

src/helpers/gateway/send.rs

@@ -69,13 +71,24 @@ impl GatewaySender {
 // TODO: make OrderingSender::send fallible
 // TODO: test channel close
 let i = usize::from(record_id);
+ self.pending_records.lock().unwrap().insert(i);


I think it is actually harder than that. Protocols may hang even before they call send and this approach does not seem to let us detect that.

If we look at send buffer, it is essentially a contiguous region in memory that is capable of storing N homogenious messages [_, _, _, _, _, _]. There is a pending window of records we want to send at each step.

For example, if buffer size is 10 messages x 4 bytes each, OrderingSender will have a buffer of size 40 and first will accept records 0..9. Once it receives them all, it flushes it down to transport and moves the window to recrods 10..19, etc.

Our job here is to figure out the current window (start, end) and figure out the gaps inside that buffer. Gaps are records that are never attempted to be sent (not inside State/waiting) and then print them

Ideal output would be something like this:

step: A, waiting to send: 14, 17 step B, waiting to send: 3, 7, 8 step C: waiting to receive: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9

Summary: Test Plan: Reviewers: Subscribers: Tasks: Tags:

akoshelev · 2023-07-18T00:32:39Z

src/helpers/gateway/mod.rs

@@ -116,6 +122,33 @@ impl<T: Transport> Gateway<T> {
 .get_or_create(channel_id, || self.transport.receive(channel_id)),
 )
 }
+
+ fn create_idle_tracker(senders: Arc<GatewaySenders>, receivers: Arc<GatewayReceivers<T>>) -> Option<tokio::task::JoinHandle<()>> {
+ if !cfg!(debug_assertions) {


#[cfg(debug_assertions)] is better as you don't need to handle it in runtime

sounds good

akoshelev · 2023-07-18T00:33:06Z

src/helpers/buffers/ordering_sender.rs

+ state.check_idle_and_reset()
+ }
+
+ pub fn get_status(&self) ->(usize /*next*/,usize/* current written */, usize /* total buffer size */) {


a new type would explain it better imo

akoshelev · 2023-07-18T00:43:02Z

src/helpers/buffers/unordered_receiver.rs

@@ -143,6 +144,9 @@ where
 /// end-to-end back pressure for tasks that do not involve sending at all.
 overflow_wakers: Vec<Waker>,
 _marker: PhantomData<C>,
+
+ idle: bool,
+ messages_waiting_for_receive: Arc<DashSet<usize>>,


can you derive it from wakers? whenever someone calls receive and polls it, we either resolve it immediately, or register a waker.

note that some wakers will land in overflow_wakers initially but it shouldn't be a problem as they all eventually move to wakers. we can do something about overflow_wakers later

RuiyuZhu · 2023-07-18T16:41:40Z

src/helpers/gateway/mod.rs

@@ -40,8 +41,9 @@ pub type ReceivingEnd<M> = ReceivingEndBase<TransportImpl, M>;
 pub struct Gateway<T: Transport = TransportImpl> {
 config: GatewayConfig,
 transport: RoleResolvingTransport<T>,
- senders: GatewaySenders,
- receivers: GatewayReceivers<T>,
+ senders: Arc<GatewaySenders>,


Yes I think this is needed. We need to ensure that the copies owned by the idle tracking task can reflect the updates in the original ones. Without Arc, Clone doesn't seem to accomplish that.

akoshelev · 2023-07-18T03:33:05Z

src/helpers/buffers/unordered_receiver.rs

@@ -201,9 +206,12 @@ where

 /// Poll for the next record. This should only be invoked when
 /// the future for the next message is polled.
- fn poll_next<M: Message>(&mut self, cx: &mut Context<'_>) -> Poll<Result<M, Error>> {
+ fn poll_next<M: Message>(&mut self, i:usize, cx: &mut Context<'_>) -> Poll<Result<M, Error>> {


this feels wrong because it should know the index (wake_next())

yeah I agree. Removed.

RuiyuZhu · 2023-07-18T16:41:40Z

src/helpers/gateway/mod.rs

@@ -40,8 +41,9 @@ pub type ReceivingEnd<M> = ReceivingEndBase<TransportImpl, M>;
 pub struct Gateway<T: Transport = TransportImpl> {
 config: GatewayConfig,
 transport: RoleResolvingTransport<T>,
- senders: GatewaySenders,
- receivers: GatewayReceivers<T>,
+ senders: Arc<GatewaySenders>,


Yes I think this is needed. We need to ensure that the copies owned by the idle tracking task can reflect the updates in the original ones. Without Arc, Clone doesn't seem to accomplish that.

Summary: Test Plan: Reviewers: Subscribers: Tasks: Tags:

akoshelev · 2023-07-19T05:55:13Z

src/helpers/gateway/mod.rs

+ // TODO: print something
+ let sender_message =senders.get_all_missing_records();
+ if !sender_message.is_empty() {
+ println!("{:?}: Idle: waiting to send messages: {:?}", thread::current().id(), sender_message);


thread id does not give us much, so we can omit it. tokio tasks are run on a thread pool
also, tracing::warn! is better than println!

akoshelev · 2023-07-19T06:16:23Z

src/helpers/gateway/send.rs

@@ -36,18 +36,26 @@ pub(super) struct GatewaySender {
 channel_id: ChannelId,
 ordering_tx: OrderingSender,
 total_records: TotalRecords,
+
+ message_size: usize,
+ pending_records: Mutex<HashSet<usize>>,


you seem to track indices inside the ordering sender, do you still need this?

akoshelev · 2023-07-19T06:19:52Z

src/helpers/gateway/mod.rs

+ let _ = tokio::time::sleep(Duration::from_secs(5)).await;
+ if senders.check_idle_and_reset() && receivers.check_idle_and_reset() {
+ // TODO: print something
+ let sender_message =senders.get_all_missing_records();


lets delegate the responsibility of making the string here. i.e. the API should probably look like this

let missing_records = senders.get_pending(); // fn get_pending(&self) -> impl Iterator<item = usize> let str = missing_records.map(...)

akoshelev · 2023-07-19T06:21:51Z

src/helpers/gateway/mod.rs

+
+impl<T: Transport> Drop for Gateway<T> {
+ fn drop(&mut self) {
+ #[cfg(debug_assertions)]


moving it to line 151 will make it cleaner imo

akoshelev · 2023-07-19T06:22:06Z

src/helpers/gateway/mod.rs

@@ -116,6 +126,38 @@ impl<T: Transport> Gateway<T> {
 .get_or_create(channel_id, || self.transport.receive(channel_id)),
 )
 }
+
+ fn create_idle_tracker(senders: Arc<GatewaySenders>, receivers: Arc<GatewayReceivers<T>>) -> Option<tokio::task::JoinHandle<()>> {


we should return JoinHandle and wrap it in Option in constructor

akoshelev · 2023-07-19T06:26:17Z

src/helpers/gateway/mod.rs

@@ -59,6 +61,13 @@ impl<T: Transport> Gateway<T> {
 roles: RoleAssignment,
 transport: T,
 ) -> Self {
+ let senders = Arc::new(GatewaySenders::default());
+ let receivers = Arc::new(GatewayReceivers::default());
+ let mut handle :Option<tokio::task::JoinHandle<()>> = None;


let handle = if cfg!(debug_assertions) { Some(Self::create(...)) } else { None }

can we consider working with GatewaySenders rather than Arc<GatewaySenders> if debug assertions are disabled?

Sounds good

Sure. Moved Arc to debug only

akoshelev · 2023-07-19T06:38:12Z

src/helpers/buffers/mod.rs

@@ -38,3 +38,49 @@ mod waiting {
 }
 }
 }
+
+pub trait GatherWaitingMessage {
+ fn compress_numbers(&self, numbers: &[usize]) -> String {


would something like this work here?

Yeah it works.

Summary: Test Plan: Reviewers: Subscribers: Tasks: Tags:

akoshelev · 2023-07-20T17:59:48Z

Cargo.toml

@@ -87,6 +87,7 @@ tracing-subscriber = { version = "0.3.17", features = ["env-filter"] }
 typenum = "1.16"
 # hpke is pinned to it
 x25519-dalek = "2.0.0-pre.0"
+itertools = "0.11.0"


what functionality is required from this crate? we typically avoid pulling such heavy crates into our deps

it's for the "group_by" function (to fold the indexes).

I'd prefer if we don't pull it if possible

akoshelev · 2023-07-20T18:11:55Z

src/helpers/buffers/ordering_sender.rs

@@ -97,7 +100,7 @@ impl State {
 if self.written > 0 && (self.written + self.spare.get() >= self.buf.len() || self.closed) {
 let v = self.buf[..self.written].to_vec();
 self.written = 0;
-
+ self.idle = false;


just noticed that it is not 100% accurate. if buffers are very large, take won't happen for quite some time while there will be many write calls indicating that buffer is not idle.

Having said that, have you explored the avenue of letting code outside observe the buffer state and decide whether it is idle or no? It feels a much more scalable approach that does not require "observable" state to be plugged in buffer's code. It can be done with Deref polymorphism (wrapper) or by exploring buffer's internal state and comparing it with the latest snapshot. For send buffer it could be as simple as counting messages written to it and keeping this number as the state.

akoshelev · 2023-07-20T18:38:50Z

src/helpers/buffers/ordering_sender.rs

@@ -197,6 +214,23 @@ impl Waiting {
 fn wake(&self, i: usize) {
 self.shard(i).wake(i);
 }
+
+ fn get_waiting_messages(&self) -> Vec<usize> {
+ let mut waiting_messages = self.shards[0].lock().unwrap().get_waiting_messages();


I am not sure I understand how it works now. This returns messages waiting to be sent, so from the protocol's standpoint everything is done correctly - they sent the message. What we are interested at is messages that infra hasn't received from protocols yet (gaps)

We want to figure out what are missing - I get that by subtracting the "not missing messages" from the set of all messages.

akoshelev · 2023-07-20T18:40:35Z

src/helpers/gateway/mod.rs

+ if senders.check_idle_and_reset() && receivers.check_idle_and_reset() {
+ let sender_missing_records =senders.get_all_missing_records();
+ let sender_message : HashMap<&ChannelId, String> = sender_missing_records.iter().map(|entry|{
+ let (SenderStatus {next, current_written , buf_size, message_size},missing_records) = entry.1;


I don't see where you use sender status struct fields, is it intentional or I am missing something?

They are used in the next few lines. E.g. let chunk_head = next - current_written / message_size; uses next, etc

akoshelev · 2023-07-20T18:41:46Z

src/helpers/gateway/mod.rs

+ }
+ }
+
+ (entry.0, response)


why can't you print it right away instead of collecting?

Because I want to print some hint first (e.g. ""Idle: waiting to send messages:\n") before printing the actual messages to increase readability. Printing right away will make it not so straight-forward to decide whether to print the hint.

akoshelev · 2023-07-20T18:52:12Z

src/helpers/gateway/mod.rs

+ }
+ }
+ if chunk_response.len() > 0 {
+ response = response + &chunk_response_head + &Self::compress_numbers(&chunk_response) + " if not closed early.\n";


it is a bit hard to read - would it make sense to do this

ask sender buffer to give us all records ids that are missing

convert Vec<usize> to Vec<MissingRange<usize>> using the contiguous range algo

spit out Vec<MissingRange<usize>> to logging system using the debug formatter `{:?}'

and the missing range is just a wrapper around standard Range struct to allow custom formatting

struct MissingRange(Range<usize>); impl Debug for MissingRange { .. // format start..end as [start..end] // if start == end format as [start] }

the more stuff we pull out of this function, the easier it will be to understand what is going on here

akoshelev · 2023-07-20T18:52:48Z

src/helpers/gateway/mod.rs

+type ReceiverType<T> = Arc<GatewayReceivers<T>>;
+
+#[cfg(not(debug_assertions))]
+type SenderType = Arc<GatewaySenders>;


this is exactly the same as with debug assertions

Summary: Test Plan: Reviewers: Subscribers: Tasks: Tags:

akoshelev

I think we are very close to publish this. Lets make sure we document this code, format it run ./pre-commit hook to see errors.

Encapsulation topic (see below) would be great to address

akoshelev · 2023-07-21T05:48:35Z

src/helpers/buffers/unordered_receiver.rs

+impl<S, C> IdleTrackOperatingState<S, C> where
+ S: Stream<Item = C> + Send,
+ C: AsRef<[u8]>, {
+ fn new(stream: Pin<Box<S>>, next: usize,spare: Spare,wakers: Vec<Option<Waker>>,overflow_wakers: Vec<Waker>,


just implement From<S> for IdleTrackOperatingState so you don't need to pass stuff through the constructor

akoshelev · 2023-07-21T05:52:38Z

src/helpers/gateway/receive.rs

@@ -14,8 +14,9 @@ pub struct ReceivingEnd<T: Transport, M: Message> {
 }

 /// Receiving channels, indexed by (role, step).
+#[derive(Clone)]


we wrap it into Arc, so no more need to clone I think

akoshelev · 2023-07-21T05:53:41Z

src/helpers/gateway/receive.rs

 pub(super) struct GatewayReceivers<T: Transport> {
- inner: DashMap<ChannelId, UR<T>>,
+ pub inner: DashMap<ChannelId, UR<T>>,


you probably don't need it as well

akoshelev · 2023-07-21T05:54:37Z

src/helpers/buffers/ordering_sender.rs

+ self.state.lock().unwrap().check_idle_and_reset()
+ }
+
+ pub fn get_missing_messages(&self) -> Vec<LoggingRanges> {


given that you have a wrapper now, we could move all this logging helper methods to the wrapper itself. that will provide nice encapsulation as we would not need to change send/receive buffer code at all

Summary: Test Plan: Reviewers: Subscribers: Tasks: Tags:

akoshelev

there are some things I think we need to address, but it should be good enough as first draft. We can get more feedback from other folks if we publish this to main repo

akoshelev · 2023-07-24T20:09:48Z

src/helpers/gateway/mod.rs

+ ) -> tokio::task::JoinHandle<()> {
+ tokio::task::spawn(async move {
+ // Perform some periodic work in the background
+ #[cfg(debug_assertions)]


Suggested change

#[cfg(debug_assertions)]

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Ruiyu Zhu added 6 commits July 13, 2023 10:48

Add an idle tracker for ordering_sender and corresponding State

30cf975

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add idle tracking in GateWaySenders

37b2349

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add periodical idle checking in gateway for the sender side

a9f5837

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add idle tracker for unorder_receiver

f07859f

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add idle track for gateway receiver

30b377b

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Use receiver idle tracker in the periodical task as well

c8f7fcb

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RuiyuZhu force-pushed the idle_tracking_in_gate_way branch from a30e7c7 to 6765812 Compare July 13, 2023 22:16

Add printing info about messages waiting to be sent

ed22220

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RuiyuZhu force-pushed the idle_tracking_in_gate_way branch from 6765812 to ed22220 Compare July 13, 2023 22:19

akoshelev reviewed Jul 14, 2023

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Ruiyu Zhu added 6 commits July 14, 2023 10:37

Merge is_idle() and reset_idle() to check_and_reset_idle()

4c9ebbc

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Skip mutex for gateway sender and receiver

1a2671e

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use tokio spawn instead of thread

8822342

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Put the tracker in debug only mode

e6bd0a0

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Add logging for receiver's record

3e4cfc7

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Track missing messages on senders

13387b2

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akoshelev reviewed Jul 18, 2023

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RuiyuZhu commented Jul 18, 2023

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Ruiyu Zhu added 5 commits July 18, 2023 09:57

Use #[cfg(debug_assertions)] to replace "if cfg!(debug_assertions)"

6f94045

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Use a type to represent Sender's status

eb77400

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Skip empty recording when printing gateway info

cfcc370

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extract waiting messages from wakers

4b20df8

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Clamp the list of pending messages

046c81d

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akoshelev reviewed Jul 19, 2023

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Ruiyu Zhu added 4 commits July 19, 2023 12:23

Use tracing::warn! instead of println, skip threadId

bf318e9

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tracking waiting message in ordering_senders

23b782a

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Skip Arc if it is not debug mod

acec76c

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Convert missing message index to string in gateway

27d399d

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Use group_by to fold indexes

226727d

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akoshelev reviewed Jul 20, 2023

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Ruiyu Zhu added 6 commits July 20, 2023 14:27

Correct the type for non-debug version

27a1b8e

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delete commented code

4f0c3a3

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move idle set from take to write for send

0f1aecb

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move idle tracking to a wrap class

fc887e0

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move idle tracker to a debug-only wrap as well

111c740

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Add LoggingRanges type to abstract away the details

de2801d

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akoshelev reviewed Jul 21, 2023

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Ruiyu Zhu added 6 commits July 21, 2023 10:28

Remove unnecessary clone

b16041a

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Fix format issues

b9ee7a2

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Remove pub notation for inner

30a574a

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Address pre-commit issues

f674450

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Wrap class for ordering_sender

7b050ea

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Add a wrap class for unorder_receiver

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akoshelev reviewed Jul 24, 2023

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Ruiyu Zhu added 3 commits July 24, 2023 21:52

.

33db1bc

.

976f88e

fix debug/release warnings

3ab7610

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Idle tracking in gate way #1

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Idle tracking in gate way #1

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RuiyuZhu commented Jul 13, 2023 • edited Loading

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RuiyuZhu commented Jul 13, 2023 •

edited

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