push changes experiment

2 files changed, 17 insertions, 2 deletions

diff --git a/src/simtest/bench.rs b/src/simtest/bench.rs
index 19603d2..91b0aa7 100644
--- a/src/simtest/bench.rs
+++ b/src/simtest/bench.rs
@@ -40,6 +40,13 @@ const ONLY: &str = "BENCH_SCENARIO";
 /// cores, but they share them, so delays (and what depends on timing) may come out
 /// higher than alone; message counts barely.
 const PARALLEL: &str = "BENCH_PARALLEL";
+/// If `1`, changes along writers' trees go as they are, not in Automerge sync messages
+/// (`AppState::push_changes`): `BENCH_PUSH=1`, to measure against.
+const PUSH: &str = "BENCH_PUSH";
+
+fn pushing() -> bool {
+    std::env::var(PUSH).is_ok_and(|value| value == "1")
+}
 const SETTLE: Duration = Duration::from_secs(180);
 
 /// How the swarm is made.
@@ -432,10 +439,12 @@ async fn run(seed: u64, scenario: &'static Scenario) -> String {
     let ids: Vec<String> = (0..scenario.nodes).map(|i| format!("n{i:03}")).collect();
     (scenario.net)(&sim, &ids);
     let reply_timeout = scenario.reply_timeout.unwrap_or(SYNC_REPLY_TIMEOUT);
+    let push = pushing();
     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;
+        config.push_changes = push;
     };
     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.
@@ -486,10 +495,15 @@ async fn run(seed: u64, scenario: &'static Scenario) -> String {
 
     let _ = writeln!(
         out,
-        "\n{} ({} writes at {} a second each)",
+        "\n{} ({} writes at {} a second each{})",
         scenario.name,
         WRITES,
-        1000 / WRITE_EVERY.as_millis()
+        1000 / WRITE_EVERY.as_millis(),
+        if pushing() {
+            "; changes pushed along trees"
+        } else {
+            ""
+        }
     );
     let mut joined = initial;
     for (w, (workload, writer)) in [
diff --git a/src/simtest/mod.rs b/src/simtest/mod.rs
index e9d8c15..26e85c7 100644
--- a/src/simtest/mod.rs
+++ b/src/simtest/mod.rs
@@ -187,6 +187,7 @@ impl Sim {
             earlier_actors: Vec::new(),
             timing: Timing::new(KEEPALIVE, SYNC_REPLY_TIMEOUT, DELIVERY_LIMIT),
             neighbours_k: 8,
+            push_changes: false,
             alias: Some(id.to_owned()),
             dashboard_url: None,
             electorate_window: Duration::from_secs(30 * 24 * 3600),