Add a trivial benchmark of calculating routes on today's graph

[rust-lightning] / lightning / src / routing / router.rs

diff --git a/lightning/src/routing/router.rs b/lightning/src/routing/router.rs
index 32084fad581ad55e232d997584251af168a853bc..9f1b60e0d27adf83735dfc02c0f20720e9c67161 100644 (file)
--- a/lightning/src/routing/router.rs
+++ b/lightning/src/routing/router.rs
@@ -1279,3 +1279,48 @@ mod tests {
                assert_eq!(route.paths[0][1].channel_features.le_flags(), &[0; 0]); // We can't learn any flags from invoices, sadly
        }
 }
+
+#[cfg(all(test, feature = "unstable"))]
+mod benches {
+       use super::*;
+       use util::logger::{Logger, Record};
+
+       use std::fs::File;
+       use test::Bencher;
+
+       struct DummyLogger {}
+       impl Logger for DummyLogger {
+               fn log(&self, _record: &Record) {}
+       }
+
+       #[bench]
+       fn generate_routes(bench: &mut Bencher) {
+               let mut d = File::open("net_graph-2021-02-12.bin").expect("Please fetch https://bitcoin.ninja/ldk-net_graph-879e309c128-2020-02-12.bin and place it at lightning/net_graph-2021-02-12.bin");
+               let graph = NetworkGraph::read(&mut d).unwrap();
+
+               // First, get 100 (source, destination) pairs for which route-getting actually succeeds...
+               let mut path_endpoints = Vec::new();
+               let mut seed: usize = 0xdeadbeef;
+               'load_endpoints: for _ in 0..100 {
+                       loop {
+                               seed *= 0xdeadbeef;
+                               let src = graph.get_nodes().keys().skip(seed % graph.get_nodes().len()).next().unwrap();
+                               seed *= 0xdeadbeef;
+                               let dst = graph.get_nodes().keys().skip(seed % graph.get_nodes().len()).next().unwrap();
+                               let amt = seed as u64 % 1_000_000;
+                               if get_route(src, &graph, dst, None, &[], amt, 42, &DummyLogger{}).is_ok() {
+                                       path_endpoints.push((src, dst, amt));
+                                       continue 'load_endpoints;
+                               }
+                       }
+               }
+
+               // ...then benchmark finding paths between the nodes we learned.
+               let mut idx = 0;
+               bench.iter(|| {
+                       let (src, dst, amt) = path_endpoints[idx % path_endpoints.len()];
+                       assert!(get_route(src, &graph, dst, None, &[], amt, 42, &DummyLogger{}).is_ok());
+                       idx += 1;
+               });
+       }
+}