feat(s2n-quic-qns): add --streams arg for perf client

quic/s2n-quic-qns/src/client/perf.rs

@@ -2,10 +2,10 @@
 // SPDX-License-Identifier: Apache-2.0
 
 use crate::{perf, tls, Result};
-use futures::future::try_join_all;
 use s2n_quic::{client, provider::io, Client, Connection};
 use std::path::PathBuf;
 use structopt::StructOpt;
+use tokio::task::JoinSet;
 
 #[derive(Debug, StructOpt)]
 pub struct Perf {
@@ -44,6 +44,9 @@ pub struct Perf {
     #[structopt(long, default_value)]
     receive: u64,
 
+    #[structopt(long, default_value = "1")]
+    streams: u64,
+
     #[structopt(flatten)]
     limits: perf::Limits,
 
@@ -56,7 +59,7 @@ impl Perf {
     pub async fn run(&self) -> Result<()> {
         let mut client = self.client()?;
 
-        let mut requests = vec![];
+        let mut requests = JoinSet::new();
 
         // TODO support a richer connection strategy
         for _ in 0..self.connections.unwrap_or(1) {
@@ -69,37 +72,45 @@ impl Perf {
             }
             let connection = client.connect(connect).await?;
 
-            requests.push(handle_connection(connection, self.send, self.receive));
+            requests.spawn(handle_connection(
+                connection,
+                self.streams,
+                self.send,
+                self.receive,
+            ));
         }
 
-        try_join_all(requests).await?;
+        // wait until all of the connections finish before closing
+        while requests.join_next().await.is_some() {}
+
         client.wait_idle().await?;
 
         return Ok(());
 
         async fn handle_connection(
             mut connection: Connection,
+            streams: u64,
             send: u64,
             receive: u64,
         ) -> Result<()> {
             if send == 0 && receive == 0 {
                 return Ok(());
             }
 
-            let stream = connection.open_bidirectional_stream().await?;
-            let (receive_stream, mut send_stream) = stream.split();
+            for _ in 0..streams {
+                let stream = connection.open_bidirectional_stream().await?;
+                let (receive_stream, mut send_stream) = stream.split();
 
-            let s = tokio::spawn(async move {
-                perf::write_stream_size(&mut send_stream, receive).await?;
-                perf::handle_send_stream(send_stream, send).await?;
-                <Result<()>>::Ok(())
-            });
+                let s = async move {
+                    perf::write_stream_size(&mut send_stream, receive).await?;
+                    perf::handle_send_stream(send_stream, send).await?;
+                    <Result<()>>::Ok(())
+                };
 
-            let r = tokio::spawn(perf::handle_receive_stream(receive_stream));
+                let r = perf::handle_receive_stream(receive_stream);
 
-            let (s, r) = tokio::try_join!(s, r)?;
-            s?;
-            r?;
+                let _ = tokio::try_join!(s, r)?;
+            }
 
             Ok(())
         }

quic/s2n-quic-qns/src/perf.rs

@@ -15,7 +15,7 @@ use std::sync::{
 
 /// Drains a receive stream
 pub async fn handle_receive_stream(mut stream: ReceiveStream) -> Result<()> {
-    let mut chunks = vec![Bytes::new(); 64];
+    let mut chunks: [_; 64] = core::array::from_fn(|_| Bytes::new());
 
     loop {
         let (len, is_open) = stream.receive_vectored(&mut chunks).await?;
@@ -35,7 +35,7 @@ pub async fn handle_receive_stream(mut stream: ReceiveStream) -> Result<()> {
 
 /// Sends a specified amount of data on a send stream
 pub async fn handle_send_stream(mut stream: SendStream, len: u64) -> Result<()> {
-    let mut chunks = vec![Bytes::new(); 64];
+    let mut chunks: [_; 64] = core::array::from_fn(|_| Bytes::new());
 
     //= https://tools.ietf.org/id/draft-banks-quic-performance-00#4.1
     //# Since the goal here is to measure the efficiency of the QUIC