speeding up metrics by reducing string generation and Hashmap access with a metrics cache for msg/send and msg/recv

network/src/lib.rs

@@ -1,4 +1,4 @@
-#![feature(trait_alias, try_trait, async_closure)]
+#![feature(trait_alias, try_trait, async_closure, const_if_match)]
 
 //! Crate to handle high level networking of messages with different
 //! requirements and priorities over a number of protocols

network/src/metrics.rs

@@ -1,6 +1,10 @@
-use crate::types::Pid;
-use prometheus::{IntCounter, IntCounterVec, IntGauge, IntGaugeVec, Opts, Registry};
+use crate::types::{Cid, Frame, Pid};
+use prometheus::{
+    core::{AtomicI64, GenericCounter},
+    IntCounter, IntCounterVec, IntGauge, IntGaugeVec, Opts, Registry,
+};
 use std::error::Error;
+use tracing::*;
 
 //TODO: switch over to Counter for frames_count, message_count, bytes_send,
 // frames_message_count 1 NetworkMetrics per Network
@@ -239,3 +243,91 @@ impl std::fmt::Debug for NetworkMetrics {
         write!(f, "NetworkMetrics()")
     }
 }
+
+/*
+pub(crate) struct PidCidFrameCache<T: MetricVecBuilder> {
+    metric: MetricVec<T>,
+    pid: String,
+    cache: Vec<[T::M; 8]>,
+}
+*/
+
+pub(crate) struct PidCidFrameCache {
+    metric: IntCounterVec,
+    pid: String,
+    cache: Vec<[GenericCounter<AtomicI64>; 8]>,
+}
+
+impl PidCidFrameCache {
+    const CACHE_SIZE: usize = 16;
+
+    pub fn new(metric: IntCounterVec, pid: Pid) -> Self {
+        Self {
+            metric,
+            pid: pid.to_string(),
+            cache: vec![],
+        }
+    }
+
+    fn populate(&mut self, cid: Cid) {
+        let start_cid = self.cache.len();
+        for i in start_cid..=cid as usize {
+            let cid = (i as Cid).to_string();
+            let entry = [
+                self.metric
+                    .with_label_values(&[&self.pid, &cid, Frame::int_to_string(0)]),
+                self.metric
+                    .with_label_values(&[&self.pid, &cid, Frame::int_to_string(1)]),
+                self.metric
+                    .with_label_values(&[&self.pid, &cid, Frame::int_to_string(2)]),
+                self.metric
+                    .with_label_values(&[&self.pid, &cid, Frame::int_to_string(3)]),
+                self.metric
+                    .with_label_values(&[&self.pid, &cid, Frame::int_to_string(4)]),
+                self.metric
+                    .with_label_values(&[&self.pid, &cid, Frame::int_to_string(5)]),
+                self.metric
+                    .with_label_values(&[&self.pid, &cid, Frame::int_to_string(6)]),
+                self.metric
+                    .with_label_values(&[&self.pid, &cid, Frame::int_to_string(7)]),
+            ];
+            self.cache.push(entry);
+        }
+    }
+
+    pub fn with_label_values(&mut self, cid: Cid, frame: &Frame) -> &GenericCounter<AtomicI64> {
+        if cid > (Self::CACHE_SIZE as Cid) {
+            warn!(
+                ?cid,
+                "cid, getting quite high, is this a attack on the cache?"
+            );
+        }
+        self.populate(cid);
+        &self.cache[cid as usize][frame.get_int() as usize]
+    }
+}
+
+pub(crate) struct CidFrameCache {
+    cache: [GenericCounter<AtomicI64>; 8],
+}
+
+impl CidFrameCache {
+    pub fn new(metric: IntCounterVec, cid: Cid) -> Self {
+        let cid = cid.to_string();
+        let cache = [
+            metric.with_label_values(&[&cid, Frame::int_to_string(0)]),
+            metric.with_label_values(&[&cid, Frame::int_to_string(1)]),
+            metric.with_label_values(&[&cid, Frame::int_to_string(2)]),
+            metric.with_label_values(&[&cid, Frame::int_to_string(3)]),
+            metric.with_label_values(&[&cid, Frame::int_to_string(4)]),
+            metric.with_label_values(&[&cid, Frame::int_to_string(5)]),
+            metric.with_label_values(&[&cid, Frame::int_to_string(6)]),
+            metric.with_label_values(&[&cid, Frame::int_to_string(7)]),
+        ];
+        Self { cache }
+    }
+
+    pub fn with_label_values(&mut self, frame: &Frame) -> &GenericCounter<AtomicI64> {
+        &self.cache[frame.get_int() as usize]
+    }
+}

network/src/participant.rs

@@ -2,7 +2,7 @@ use crate::{
     api::Stream,
     channel::Channel,
     message::{InCommingMessage, MessageBuffer, OutGoingMessage},
-    metrics::NetworkMetrics,
+    metrics::{NetworkMetrics, PidCidFrameCache},
     prios::PrioManager,
     protocols::Protocols,
     types::{Cid, Frame, Pid, Prio, Promises, Sid},
@@ -27,6 +27,7 @@ use tracing::*;
 #[derive(Debug)]
 struct ChannelInfo {
     cid: Cid,
+    cid_string: String, //optimisation
     b2w_frame_s: mpsc::UnboundedSender<Frame>,
     b2r_read_shutdown: oneshot::Sender<()>,
 }
@@ -52,6 +53,7 @@ struct ControlChannels {
 #[derive(Debug)]
 pub struct BParticipant {
     remote_pid: Pid,
+    remote_pid_string: String, //optimisation
     offset_sid: Sid,
     channels: Arc<RwLock<Vec<ChannelInfo>>>,
     streams: RwLock<HashMap<Sid, StreamInfo>>,
@@ -92,6 +94,7 @@ impl BParticipant {
         (
             Self {
                 remote_pid,
+                remote_pid_string: remote_pid.to_string(),
                 offset_sid,
                 channels: Arc::new(RwLock::new(vec![])),
                 streams: RwLock::new(HashMap::new()),
@@ -164,6 +167,8 @@ impl BParticipant {
         self.running_mgr.fetch_add(1, Ordering::Relaxed);
         let mut closing_up = false;
         trace!("start send_mgr");
+        let mut send_cache =
+            PidCidFrameCache::new(self.metrics.frames_out_total.clone(), self.remote_pid);
         //while !self.closed.load(Ordering::Relaxed) {
         loop {
             let mut frames = VecDeque::new();
@@ -173,7 +178,7 @@ impl BParticipant {
                 trace!("tick {}", len);
             }
             for (_, frame) in frames {
-                self.send_frame(frame).await;
+                self.send_frame(frame, &mut send_cache).await;
             }
             async_std::task::sleep(TICK_TIME).await;
             //shutdown after all msg are send!
@@ -189,17 +194,12 @@ impl BParticipant {
         self.running_mgr.fetch_sub(1, Ordering::Relaxed);
     }
 
-    async fn send_frame(&self, frame: Frame) {
+    async fn send_frame(&self, frame: Frame, frames_out_total_cache: &mut PidCidFrameCache) {
         // find out ideal channel here
         //TODO: just take first
         if let Some(ci) = self.channels.write().await.get_mut(0) {
-            self.metrics
-                .frames_out_total
-                .with_label_values(&[
-                    &self.remote_pid.to_string(),
-                    &ci.cid.to_string(),
-                    frame.get_string(),
-                ])
+            frames_out_total_cache
+                .with_label_values(ci.cid, &frame)
                 .inc();
             ci.b2w_frame_s.send(frame).await.unwrap();
         } else {
@@ -217,13 +217,12 @@ impl BParticipant {
         self.running_mgr.fetch_add(1, Ordering::Relaxed);
         trace!("start handle_frames_mgr");
         let mut messages = HashMap::new();
-        let pid_string = &self.remote_pid.to_string();
         while let Some((cid, frame)) = w2b_frames_r.next().await {
             let cid_string = cid.to_string();
             //trace!("handling frame");
             self.metrics
                 .frames_in_total
-                .with_label_values(&[&pid_string, &cid_string, frame.get_string()])
+                .with_label_values(&[&self.remote_pid_string, &cid_string, frame.get_string()])
                 .inc();
             match frame {
                 Frame::OpenStream {
@@ -247,7 +246,7 @@ impl BParticipant {
                     if let Some(si) = self.streams.write().await.remove(&sid) {
                         self.metrics
                             .streams_closed_total
-                            .with_label_values(&[&pid_string])
+                            .with_label_values(&[&self.remote_pid_string])
                             .inc();
                         si.closed.store(true, Ordering::Relaxed);
                     } else {
@@ -313,19 +312,20 @@ impl BParticipant {
                         Channel::new(cid, self.remote_pid);
                     channels.write().await.push(ChannelInfo {
                         cid,
+                        cid_string: cid.to_string(),
                         b2w_frame_s,
                         b2r_read_shutdown,
                     });
                     b2s_create_channel_done_s.send(()).unwrap();
                     self.metrics
                         .channels_connected_total
-                        .with_label_values(&[&self.remote_pid.to_string()])
+                        .with_label_values(&[&self.remote_pid_string])
                         .inc();
                     trace!(?cid, "running channel in participant");
                     channel.run(protocol, w2b_frames_s).await;
                     self.metrics
                         .channels_disconnected_total
-                        .with_label_values(&[&self.remote_pid.to_string()])
+                        .with_label_values(&[&self.remote_pid_string])
                         .inc();
                     trace!(?cid, "channel got closed");
                 }
@@ -345,6 +345,8 @@ impl BParticipant {
         self.running_mgr.fetch_add(1, Ordering::Relaxed);
         trace!("start open_mgr");
         let mut stream_ids = self.offset_sid;
+        let mut send_cache =
+            PidCidFrameCache::new(self.metrics.frames_out_total.clone(), self.remote_pid);
         let mut shutdown_open_mgr_receiver = shutdown_open_mgr_receiver.fuse();
         //from api or shutdown signal
         while let Some((prio, promises, p2a_return_stream)) = select! {
@@ -357,11 +359,14 @@ impl BParticipant {
             let stream = self
                 .create_stream(sid, prio, promises, a2p_msg_s, &a2b_close_stream_s)
                 .await;
-            self.send_frame(Frame::OpenStream {
-                sid,
-                prio,
-                promises,
-            })
+            self.send_frame(
+                Frame::OpenStream {
+                    sid,
+                    prio,
+                    promises,
+                },
+                &mut send_cache,
+            )
             .await;
             p2a_return_stream.send(stream).unwrap();
             stream_ids += Sid::from(1);
@@ -429,6 +434,8 @@ impl BParticipant {
     ) {
         self.running_mgr.fetch_add(1, Ordering::Relaxed);
         trace!("start stream_close_mgr");
+        let mut send_cache =
+            PidCidFrameCache::new(self.metrics.frames_out_total.clone(), self.remote_pid);
         let mut shutdown_stream_close_mgr_receiver = shutdown_stream_close_mgr_receiver.fuse();
 
         //from api or shutdown signal
@@ -465,11 +472,12 @@ impl BParticipant {
             trace!(?sid, "stream was successfully flushed");
             self.metrics
                 .streams_closed_total
-                .with_label_values(&[&self.remote_pid.to_string()])
+                .with_label_values(&[&self.remote_pid_string])
                 .inc();
             //only now remove the Stream, that means we can still recv on it.
             self.streams.write().await.remove(&sid);
-            self.send_frame(Frame::CloseStream { sid }).await;
+            self.send_frame(Frame::CloseStream { sid }, &mut send_cache)
+                .await;
         }
         trace!("stop stream_close_mgr");
         self.running_mgr.fetch_sub(1, Ordering::Relaxed);
@@ -493,7 +501,7 @@ impl BParticipant {
         });
         self.metrics
             .streams_opened_total
-            .with_label_values(&[&self.remote_pid.to_string()])
+            .with_label_values(&[&self.remote_pid_string])
             .inc();
         Stream::new(
             self.remote_pid,

network/src/protocols.rs

@@ -1,5 +1,5 @@
 use crate::{
-    metrics::NetworkMetrics,
+    metrics::{CidFrameCache, NetworkMetrics},
     types::{Cid, Frame, Mid, Pid, Sid},
 };
 use async_std::{
@@ -64,6 +64,7 @@ impl TcpProtocol {
         end_receiver: oneshot::Receiver<()>,
     ) {
         trace!("starting up tcp write()");
+        let mut metrics_cache = CidFrameCache::new(self.metrics.frames_wire_in_total.clone(), cid);
         let mut stream = self.stream.clone();
         let mut end_receiver = end_receiver.fuse();
         loop {
@@ -173,10 +174,7 @@ impl TcpProtocol {
                     Frame::Raw(data)
                 },
             };
-            self.metrics
-                .frames_wire_in_total
-                .with_label_values(&[&cid.to_string(), frame.get_string()])
-                .inc();
+            metrics_cache.with_label_values(&frame).inc();
             from_wire_sender.send((cid, frame)).await.unwrap();
         }
         trace!("shutting down tcp read()");
@@ -188,12 +186,9 @@ impl TcpProtocol {
     pub async fn write(&self, cid: Cid, mut to_wire_receiver: mpsc::UnboundedReceiver<Frame>) {
         trace!("starting up tcp write()");
         let mut stream = self.stream.clone();
-        let cid_string = cid.to_string();
+        let mut metrics_cache = CidFrameCache::new(self.metrics.frames_wire_out_total.clone(), cid);
         while let Some(frame) = to_wire_receiver.next().await {
-            self.metrics
-                .frames_wire_out_total
-                .with_label_values(&[&cid_string, frame.get_string()])
-                .inc();
+            metrics_cache.with_label_values(&frame).inc();
             match frame {
                 Frame::Handshake {
                     magic_number,
@@ -296,6 +291,7 @@ impl UdpProtocol {
         end_receiver: oneshot::Receiver<()>,
     ) {
         trace!("starting up udp read()");
+        let mut metrics_cache = CidFrameCache::new(self.metrics.frames_wire_in_total.clone(), cid);
         let mut data_in = self.data_in.write().await;
         let mut end_receiver = end_receiver.fuse();
         while let Some(bytes) = select! {
@@ -388,10 +384,7 @@ impl UdpProtocol {
                 },
                 _ => Frame::Raw(bytes),
             };
-            self.metrics
-                .frames_wire_in_total
-                .with_label_values(&[&cid.to_string(), frame.get_string()])
-                .inc();
+            metrics_cache.with_label_values(&frame).inc();
             from_wire_sender.send((cid, frame)).await.unwrap();
         }
         trace!("shutting down udp read()");
@@ -400,12 +393,9 @@ impl UdpProtocol {
     pub async fn write(&self, cid: Cid, mut to_wire_receiver: mpsc::UnboundedReceiver<Frame>) {
         trace!("starting up udp write()");
         let mut buffer = [0u8; 2000];
-        let cid_string = cid.to_string();
+        let mut metrics_cache = CidFrameCache::new(self.metrics.frames_wire_out_total.clone(), cid);
         while let Some(frame) = to_wire_receiver.next().await {
-            self.metrics
-                .frames_wire_out_total
-                .with_label_values(&[&cid_string, frame.get_string()])
-                .inc();
+            metrics_cache.with_label_values(&frame).inc();
             let len = match frame {
                 Frame::Handshake {
                     magic_number,

network/src/scheduler.rs

@@ -133,6 +133,7 @@ impl Scheduler {
             self.listen_mgr(run_channels.a2s_listen_r),
             self.connect_mgr(run_channels.a2s_connect_r),
             self.disconnect_mgr(run_channels.a2s_disconnect_r),
+            self.prio_adj_mgr(),
             self.scheduler_shutdown_mgr(run_channels.a2s_scheduler_shutdown_r),
         );
     }
@@ -261,6 +262,12 @@ impl Scheduler {
         trace!("stop disconnect_mgr");
     }
 
+    async fn prio_adj_mgr(&self) {
+        trace!("start prio_adj_mgr");
+        //TODO adjust prios in participants here!
+        trace!("stop prio_adj_mgr");
+    }
+
     async fn scheduler_shutdown_mgr(&self, a2s_scheduler_shutdown_r: oneshot::Receiver<()>) {
         trace!("start scheduler_shutdown_mgr");
         a2s_scheduler_shutdown_r.await.unwrap();

network/src/types.rs

@@ -89,33 +89,49 @@ pub(crate) enum Frame {
 }
 
 impl Frame {
-    pub fn get_string(&self) -> &str {
+    pub const fn int_to_string(i: u8) -> &'static str {
+        match i {
+            0 => "Handshake",
+            1 => "ParticipantId",
+            2 => "Shutdown",
+            3 => "OpenStream",
+            4 => "CloseStream",
+            5 => "DataHeader",
+            6 => "Data",
+            7 => "Raw",
+            _ => "",
+        }
+    }
+
+    pub fn get_int(&self) -> u8 {
         match self {
             Frame::Handshake {
                 magic_number: _,
                 version: _,
-            } => "Handshake",
-            Frame::ParticipantId { pid: _ } => "ParticipantId",
-            Frame::Shutdown => "Shutdown",
+            } => 0,
+            Frame::ParticipantId { pid: _ } => 1,
+            Frame::Shutdown => 2,
             Frame::OpenStream {
                 sid: _,
                 prio: _,
                 promises: _,
-            } => "OpenStream",
-            Frame::CloseStream { sid: _ } => "CloseStream",
+            } => 3,
+            Frame::CloseStream { sid: _ } => 4,
             Frame::DataHeader {
                 mid: _,
                 sid: _,
                 length: _,
-            } => "DataHeader",
+            } => 5,
             Frame::Data {
                 mid: _,
                 start: _,
                 data: _,
-            } => "Data",
-            Frame::Raw(_) => "Raw",
+            } => 6,
+            Frame::Raw(_) => 7,
         }
     }
+
+    pub fn get_string(&self) -> &str { Self::int_to_string(self.get_int()) }
 }
 
 impl Pid {