From 5994b49412c058079639585501a78e6458fdbb6f Mon Sep 17 00:00:00 2001
From: tv <tv@krebsco.de>
Date: Fri, 6 Nov 2026 19:54:09 +0100
Subject: HyParView (slim)

---
 src/simtest/bench.rs | 58 ++++++++++++++++++++++++++++++++++++++++++++--------
 1 file changed, 50 insertions(+), 8 deletions(-)

(limited to 'src/simtest/bench.rs')

diff --git a/src/simtest/bench.rs b/src/simtest/bench.rs
index 2530015..dac7a48 100644
--- a/src/simtest/bench.rs
+++ b/src/simtest/bench.rs
@@ -491,7 +491,7 @@ impl Totals {
 }
 
 /// The kinds, in the order of the report.
-const KINDS: [&str; 11] = [
+const KINDS: [&str; 12] = [
     "SYNC",
     "STATUS",
     "STATUS_REPLY",
@@ -503,9 +503,10 @@ const KINDS: [&str; 11] = [
     "LINKS",
     "PROBE",
     "PRUNE/GRAFT",
+    "NEIGHBOUR",
 ];
 
-fn counters(by: &ByKind) -> [Counter; 11] {
+fn counters(by: &ByKind) -> [Counter; 12] {
     [
         by.sync,
         by.status,
@@ -518,10 +519,11 @@ fn counters(by: &ByKind) -> [Counter; 11] {
         by.links,
         by.probe,
         by.plumtree,
+        by.hyparview,
     ]
 }
 
-fn counters_mut(by: &mut ByKind) -> [&mut Counter; 11] {
+fn counters_mut(by: &mut ByKind) -> [&mut Counter; 12] {
     [
         &mut by.sync,
         &mut by.status,
@@ -534,6 +536,7 @@ fn counters_mut(by: &mut ByKind) -> [&mut Counter; 11] {
         &mut by.links,
         &mut by.probe,
         &mut by.plumtree,
+        &mut by.hyparview,
     ]
 }
 
@@ -547,8 +550,11 @@ async fn run(seed: u64, scenario: &'static Scenario) -> (String, Vec<(&'static s
     let reply_timeout = scenario.reply_timeout.unwrap_or(SYNC_REPLY_TIMEOUT);
     let timing = move |config: &mut crate::node::NodeConfig| {
         config.timing = Timing::new(KEEPALIVE, reply_timeout, DELIVERY_LIMIT);
-        // As in production (`--neighbours`).
-        config.neighbours_k = 12;
+        // As in production (`--neighbours`): 12, or HyParView's 5 (`config::derive_defaults`).
+        config.neighbours_k = match config.topology {
+            crate::swarm::topology::Kind::Hyparview => 5,
+            crate::swarm::topology::Kind::RingAndPairs => 12,
+        };
     };
     let mut nodes = vec![sim.start_on_with(&ids[0], (scenario.on)(0), &[], Start::Genesis, timing)];
     // Those there from the start; the others join during the workloads.
@@ -620,7 +626,7 @@ async fn run(seed: u64, scenario: &'static Scenario) -> (String, Vec<(&'static s
         scenario.name,
         writes(),
         1000 / WRITE_EVERY.as_millis(),
-        all[0].dissemination.name()
+        all[0].dissemination().name()
     );
     let mut joined = initial;
     for (w, (workload, writer)) in [
@@ -685,6 +691,7 @@ async fn run(seed: u64, scenario: &'static Scenario) -> (String, Vec<(&'static s
         trees(&mut out, &nodes, &sim.net).await;
         sent_kept(&mut out, &nodes).await;
         eager_links(&mut out, &nodes, &sim.net);
+        active_views(&mut out, &nodes);
         if let Some(writer) = writer {
             slowest(&mut out, &nodes, &nodes[writer], &sim.net).await;
         }
@@ -801,6 +808,37 @@ pub(super) async fn sent_kept(out: &mut String, nodes: &[AppState]) {
     );
 }
 
+/// HyParView's active views after the workload (`swarm::hyparview`): how many neighbours
+/// each agreed to, the fewest and the most, and the links only one end has in its view
+/// (a DISCONNECT lost, or one end gave up on the other). Nothing for a topology that
+/// keeps no such views.
+pub(super) fn active_views(out: &mut String, nodes: &[AppState]) {
+    let mut views = HashMap::new();
+    for node in nodes {
+        let Some(active) = node.topology().active() else {
+            return;
+        };
+        views.insert(node.local_id().to_owned(), active);
+    }
+    let sizes: Vec<usize> = views.values().map(|active| active.len()).collect();
+    let one_ended = views
+        .iter()
+        .flat_map(|(node, active)| active.iter().map(move |other| (node, other)))
+        .filter(|(node, other)| {
+            !views
+                .get(*other)
+                .is_some_and(|theirs| theirs.contains(*node))
+        })
+        .count();
+    let _ = writeln!(
+        out,
+        "    HyParView's active views at the end: {:.1} neighbours on average, {} to {}; {one_ended} links in one end's view only",
+        sizes.iter().sum::<usize>() as f64 / sizes.len().max(1) as f64,
+        sizes.iter().min().copied().unwrap_or(0),
+        sizes.iter().max().copied().unwrap_or(0),
+    );
+}
+
 /// A link with a longer round trip is slow (`eager_links`): over Tor, a slow circuit
 /// (`tor_like`).
 const SLOW_LINK_MS: u64 = 1000;
@@ -822,12 +860,16 @@ fn mean(values: &[u64]) -> u64 {
 /// along eager links alone, by the links' latencies (the fastest such path, as the
 /// first copy of a push takes it), against writers' trees' (`trees`): how deep the
 /// tree is. Nothing for a way that keeps no such links.
-fn eager_links(out: &mut String, nodes: &[AppState], net: &crate::transport::sim::SimNet) {
+pub(super) fn eager_links(
+    out: &mut String,
+    nodes: &[AppState],
+    net: &crate::transport::sim::SimNet,
+) {
     let mut pushes: HashMap<String, Vec<String>> = HashMap::new();
     // The round trips of eager and of lazy links, as each node measured them.
     let (mut eager_rtts, mut lazy_rtts) = (Vec::new(), Vec::new());
     for node in nodes {
-        let Some(lazy) = node.dissemination.lazy() else {
+        let Some(lazy) = node.dissemination().lazy() else {
             return;
         };
         let (eager, others): (Vec<String>, Vec<String>) =
-- 
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