Add -c option to easily interrogate the number of nodes

multinode-demo/client.sh

@@ -16,6 +16,7 @@ if [[ -z $leader ]]; then
   fi
 fi
 count=${2:-1}
+shift 2
 
 rsync_leader_url=$(rsync_url "$leader")
 
@@ -30,4 +31,4 @@ $solana_client_demo \
   -n "$count" \
   -l "$SOLANA_CONFIG_CLIENT_DIR"/leader.json \
   -k "$SOLANA_CONFIG_CLIENT_DIR"/client.json \
-
+  "$@"

src/bin/client-demo.rs

@@ -195,6 +195,11 @@ fn main() {
                 .takes_value(true)
                 .help("send transactions for this many seconds"),
         )
+        .arg(
+            Arg::with_name("converge_only")
+                .short("c")
+                .help("exit immediately after converging"),
+        )
         .get_matches();
 
     let leader: NodeInfo;
@@ -225,9 +230,13 @@ fn main() {
     let signal = Arc::new(AtomicBool::new(false));
     let mut c_threads = vec![];
     let validators = converge(&leader, &signal, num_nodes, &mut c_threads);
-    println!("Network has {} node(s)", validators.len());
+    println!("Nodes: {}", validators.len());
     assert!(validators.len() >= num_nodes);
 
+    if matches.is_present("converge_only") {
+        return;
+    }
+
     let mut client = mk_client(&leader);
 
     let starting_balance = client.poll_get_balance(&id.pubkey()).unwrap();