Remove write lock (#9311)

* Remove write lock

Co-authored-by: Carl <carl@solana.com>

core/benches/cluster_info.rs

@@ -7,9 +7,7 @@ use solana_core::cluster_info::{ClusterInfo, Node};
 use solana_core::contact_info::ContactInfo;
 use solana_sdk::pubkey::Pubkey;
 use solana_sdk::timing::timestamp;
-use std::collections::HashMap;
-use std::net::UdpSocket;
-use std::sync::Arc;
+use std::{collections::HashMap, net::UdpSocket, sync::Arc, time::Instant};
 use test::Bencher;
 
 #[bench]
@@ -36,7 +34,13 @@ fn broadcast_shreds_bench(bencher: &mut Bencher) {
     bencher.iter(move || {
         let shreds = shreds.clone();
         cluster_info
-            .broadcast_shreds(&socket, shreds, &seeds, Some(stakes.clone()))
+            .broadcast_shreds(
+                &socket,
+                shreds,
+                &seeds,
+                Some(stakes.clone()),
+                &mut Instant::now(),
+            )
             .unwrap();
     });
 }

core/src/broadcast_stage.rs

@@ -104,7 +104,7 @@ trait BroadcastRun {
         blockstore_sender: &Sender<Arc<Vec<Shred>>>,
     ) -> Result<()>;
     fn transmit(
-        &self,
+        &mut self,
         receiver: &Arc<Mutex<Receiver<TransmitShreds>>>,
         cluster_info: &Arc<RwLock<ClusterInfo>>,
         sock: &UdpSocket,
@@ -226,7 +226,7 @@ impl BroadcastStage {
         let socket_receiver = Arc::new(Mutex::new(socket_receiver));
         for sock in socks.into_iter() {
             let socket_receiver = socket_receiver.clone();
-            let bs_transmit = broadcast_stage_run.clone();
+            let mut bs_transmit = broadcast_stage_run.clone();
             let cluster_info = cluster_info.clone();
             let t = Builder::new()
                 .name("solana-broadcaster-transmit".to_string())

core/src/broadcast_stage/broadcast_fake_shreds_run.rs

@@ -96,7 +96,7 @@ impl BroadcastRun for BroadcastFakeShredsRun {
         Ok(())
     }
     fn transmit(
-        &self,
+        &mut self,
         receiver: &Arc<Mutex<Receiver<TransmitShreds>>>,
         cluster_info: &Arc<RwLock<ClusterInfo>>,
         sock: &UdpSocket,

core/src/broadcast_stage/fail_entry_verification_broadcast_run.rs

@@ -72,7 +72,7 @@ impl BroadcastRun for FailEntryVerificationBroadcastRun {
         Ok(())
     }
     fn transmit(
-        &self,
+        &mut self,
         receiver: &Arc<Mutex<Receiver<TransmitShreds>>>,
         cluster_info: &Arc<RwLock<ClusterInfo>>,
         sock: &UdpSocket,
@@ -81,10 +81,13 @@ impl BroadcastRun for FailEntryVerificationBroadcastRun {
         let all_seeds: Vec<[u8; 32]> = shreds.iter().map(|s| s.seed()).collect();
         // Broadcast data
         let all_shred_bufs: Vec<Vec<u8>> = shreds.to_vec().into_iter().map(|s| s.payload).collect();
-        cluster_info
-            .write()
-            .unwrap()
-            .broadcast_shreds(sock, all_shred_bufs, &all_seeds, stakes)?;
+        cluster_info.read().unwrap().broadcast_shreds(
+            sock,
+            all_shred_bufs,
+            &all_seeds,
+            stakes,
+            &mut Instant::now(),
+        )?;
         Ok(())
     }
     fn record(

core/src/broadcast_stage/standard_broadcast_run.rs

@@ -37,6 +37,7 @@ pub(super) struct StandardBroadcastRun {
     slot_broadcast_start: Option<Instant>,
     keypair: Arc<Keypair>,
     shred_version: u16,
+    last_datapoint_submit: Instant,
 }
 
 impl StandardBroadcastRun {
@@ -48,6 +49,7 @@ impl StandardBroadcastRun {
             slot_broadcast_start: None,
             keypair,
             shred_version,
+            last_datapoint_submit: Instant::now(),
         }
     }
 
@@ -249,7 +251,7 @@ impl StandardBroadcastRun {
     }
 
     fn broadcast(
-        &self,
+        &mut self,
         sock: &UdpSocket,
         cluster_info: &Arc<RwLock<ClusterInfo>>,
         stakes: Option<Arc<HashMap<Pubkey, u64>>>,
@@ -264,10 +266,13 @@ impl StandardBroadcastRun {
         let shred_bufs: Vec<Vec<u8>> = shreds.to_vec().into_iter().map(|s| s.payload).collect();
         trace!("Broadcasting {:?} shreds", shred_bufs.len());
 
-        cluster_info
-            .write()
-            .unwrap()
-            .broadcast_shreds(sock, shred_bufs, &seeds, stakes)?;
+        cluster_info.read().unwrap().broadcast_shreds(
+            sock,
+            shred_bufs,
+            &seeds,
+            stakes,
+            &mut self.last_datapoint_submit,
+        )?;
 
         let broadcast_elapsed = broadcast_start.elapsed();
 
@@ -332,7 +337,7 @@ impl BroadcastRun for StandardBroadcastRun {
         )
     }
     fn transmit(
-        &self,
+        &mut self,
         receiver: &Arc<Mutex<Receiver<TransmitShreds>>>,
         cluster_info: &Arc<RwLock<ClusterInfo>>,
         sock: &UdpSocket,

core/src/cluster_info.rs

@@ -101,7 +101,6 @@ pub struct ClusterInfo {
     pub(crate) keypair: Arc<Keypair>,
     /// The network entrypoint
     entrypoint: Option<ContactInfo>,
-    last_datapoint_submit: Instant,
 }
 
 #[derive(Default, Clone)]
@@ -209,7 +208,6 @@ impl ClusterInfo {
             gossip: CrdsGossip::default(),
             keypair,
             entrypoint: None,
-            last_datapoint_submit: Instant::now(),
         };
         let id = contact_info.id;
         me.gossip.set_self(&id);
@@ -949,22 +947,23 @@ impl ClusterInfo {
     /// broadcast messages from the leader to layer 1 nodes
     /// # Remarks
     pub fn broadcast_shreds(
-        &mut self,
+        &self,
         s: &UdpSocket,
         shreds: Vec<Vec<u8>>,
         seeds: &[[u8; 32]],
         stakes: Option<Arc<HashMap<Pubkey, u64>>>,
+        last_datapoint_submit: &mut Instant,
     ) -> Result<()> {
         let (peers, peers_and_stakes) = self.sorted_tvu_peers_and_stakes(stakes);
         let broadcast_len = peers_and_stakes.len();
         if broadcast_len == 0 {
-            if duration_as_s(&Instant::now().duration_since(self.last_datapoint_submit)) >= 1.0 {
+            if duration_as_s(&Instant::now().duration_since(*last_datapoint_submit)) >= 1.0 {
                 datapoint_info!(
                     "cluster_info-num_nodes",
                     ("live_count", 1, i64),
                     ("broadcast_count", 1, i64)
                 );
-                self.last_datapoint_submit = Instant::now();
+                *last_datapoint_submit = Instant::now();
             }
             return Ok(());
         }
@@ -995,13 +994,13 @@ impl ClusterInfo {
                 num_live_peers += 1;
             }
         });
-        if duration_as_s(&Instant::now().duration_since(self.last_datapoint_submit)) >= 1.0 {
+        if duration_as_s(&Instant::now().duration_since(*last_datapoint_submit)) >= 1.0 {
             datapoint_info!(
                 "cluster_info-num_nodes",
                 ("live_count", num_live_peers, i64),
                 ("broadcast_count", broadcast_len + 1, i64)
             );
-            self.last_datapoint_submit = Instant::now();
+            *last_datapoint_submit = Instant::now();
         }
         Ok(())
     }