chore: Implement latency-simulating benchmarks

car-mirror-benches/Cargo.toml

@@ -12,6 +12,7 @@ async-trait = "0.1"
 bytes = "1.4.0"
 car-mirror = { path = "../car-mirror", version = "0.1", features = ["test_utils"] }
 libipld = "0.16.0"
+serde_ipld_dagcbor = "0.4.0"
 wnfs-common = "0.1.23"
 
 [dev-dependencies]
@@ -24,3 +25,7 @@ harness = false
 [[bench]]
 name = "artificially_slow_blockstore"
 harness = false
+
+[[bench]]
+name = "simulated_latency"
+harness = false

car-mirror-benches/benches/simulated_latency.rs

@@ -0,0 +1,176 @@
+use car_mirror::{
+    common::Config,
+    pull, push,
+    test_utils::{arb_ipld_dag, links_to_padded_ipld, setup_blockstore},
+};
+use criterion::{criterion_group, criterion_main, BatchSize, Criterion};
+use std::{ops::Range, time::Duration};
+use wnfs_common::MemoryBlockStore;
+
+// We artificially slow down sending & receiving data.
+// This is the *one way* latency.
+const LATENCY: Duration = Duration::from_millis(150);
+// We also simulate limited bandwidth.
+// We assume that upload & download are asymmetrical.
+// Taking statistics from here: https://www.statista.com/statistics/896779/average-mobile-fixed-broadband-download-upload-speeds/
+// and using mobile numbers, so 10.33 Mbps for upload and 42.07 Mbps for download.
+// This gives us ~1291250 bytes per second upload and ~5258750 bytes per second download.
+// Inverting this gives us ~774 nanoseconds per byte upload and ~190 nanoseconds per byte download.
+const UPLOAD_DELAY_PER_BYTE: Duration = Duration::from_nanos(774);
+const DOWNLOAD_DELAY_PER_BYTE: Duration = Duration::from_nanos(227);
+
+async fn simulate_upload_latency(request_size: usize) {
+    let delay = LATENCY + UPLOAD_DELAY_PER_BYTE * request_size as u32;
+    async_std::task::sleep(delay).await;
+}
+
+async fn simulate_download_latency(response_size: usize) {
+    let delay = LATENCY + DOWNLOAD_DELAY_PER_BYTE * response_size as u32;
+    async_std::task::sleep(delay).await;
+}
+
+pub fn pull_with_simulated_latency_10kb_blocks(c: &mut Criterion) {
+    // Very highly connected
+    // 10KiB random data added
+    // ~61 blocks on average
+    pull_with_simulated_latency(c, 60..64, 0.9, 10 * 1024);
+}
+
+pub fn pull_with_simulated_latency_1kb_blocks(c: &mut Criterion) {
+    // Very highly connected
+    // 1KiB random data added
+    // ~625 blocks on average
+    pull_with_simulated_latency(c, 600..640, 0.9, 1024);
+}
+
+pub fn pull_with_simulated_latency(
+    c: &mut Criterion,
+    dag_size: impl Into<Range<u16>>,
+    edge_probability: f64,
+    block_padding: usize,
+) {
+    let mut rvg = car_mirror::test_utils::Rvg::deterministic();
+
+    let dag_size = dag_size.into();
+
+    let bench_name = format!(
+        "pull with simulated latency, {block_padding} byte blocks, ~{}..{} blocks",
+        dag_size.start, dag_size.end
+    );
+
+    c.bench_function(&bench_name, |b| {
+        b.iter_batched(
+            || {
+                let (blocks, root) = rvg.sample(&arb_ipld_dag(
+                    dag_size.clone(),
+                    edge_probability,
+                    links_to_padded_ipld(block_padding),
+                ));
+                let store = async_std::task::block_on(setup_blockstore(blocks)).unwrap();
+                (store, root)
+            },
+            |(ref server_store, root)| {
+                let client_store = &MemoryBlockStore::new();
+                let config = &Config::default();
+
+                // Simulate a multi-round protocol run in-memory
+                async_std::task::block_on(async move {
+                    let mut request = pull::request(root, None, config, client_store).await?;
+                    loop {
+                        let request_bytes = serde_ipld_dagcbor::to_vec(&request)?.len();
+                        simulate_upload_latency(request_bytes).await;
+
+                        let response = pull::response(root, request, config, server_store).await?;
+                        simulate_download_latency(response.bytes.len()).await;
+
+                        request = pull::request(root, Some(response), config, client_store).await?;
+
+                        if request.indicates_finished() {
+                            break;
+                        }
+                    }
+
+                    Ok::<(), anyhow::Error>(())
+                })
+                .unwrap();
+            },
+            BatchSize::LargeInput,
+        )
+    });
+}
+
+pub fn push_with_simulated_latency_10kb_blocks(c: &mut Criterion) {
+    // Very highly connected
+    // 10KiB random data added
+    // ~61 blocks on average
+    push_with_simulated_latency(c, 60..64, 0.9, 10 * 1024);
+}
+
+pub fn push_with_simulated_latency_1kb_blocks(c: &mut Criterion) {
+    // Very highly connected
+    // 1KiB random data added
+    // ~625 blocks on average
+    push_with_simulated_latency(c, 600..640, 0.9, 1024);
+}
+
+pub fn push_with_simulated_latency(
+    c: &mut Criterion,
+    dag_size: impl Into<Range<u16>>,
+    edge_probability: f64,
+    block_padding: usize,
+) {
+    let mut rvg = car_mirror::test_utils::Rvg::deterministic();
+
+    let dag_size = dag_size.into();
+
+    let bench_name = format!(
+        "push with simulated latency, {block_padding} byte blocks, ~{}..{} blocks",
+        dag_size.start, dag_size.end
+    );
+
+    c.bench_function(&bench_name, |b| {
+        b.iter_batched(
+            || {
+                let (blocks, root) = rvg.sample(&arb_ipld_dag(
+                    dag_size.clone(),
+                    edge_probability,
+                    links_to_padded_ipld(block_padding),
+                ));
+                let store = async_std::task::block_on(setup_blockstore(blocks)).unwrap();
+                (store, root)
+            },
+            |(ref client_store, root)| {
+                let server_store = &MemoryBlockStore::new();
+                let config = &Config::default();
+
+                // Simulate a multi-round protocol run in-memory
+                async_std::task::block_on(async move {
+                    let mut request = push::request(root, None, config, client_store).await?;
+                    loop {
+                        simulate_upload_latency(request.bytes.len()).await;
+
+                        let response = push::response(root, request, config, server_store).await?;
+                        let response_bytes = serde_ipld_dagcbor::to_vec(&response)?.len();
+                        simulate_download_latency(response_bytes).await;
+
+                        if response.indicates_finished() {
+                            break;
+                        }
+                        request = push::request(root, Some(response), config, client_store).await?;
+                    }
+
+                    Ok::<(), anyhow::Error>(())
+                })
+                .unwrap();
+            },
+            BatchSize::LargeInput,
+        )
+    });
+}
+
+criterion_group! {
+    name = benches;
+    config = Criterion::default().sample_size(10); // Reduced sample size due to ~2s per test
+    targets = pull_with_simulated_latency_10kb_blocks, pull_with_simulated_latency_1kb_blocks, push_with_simulated_latency_10kb_blocks, push_with_simulated_latency_1kb_blocks
+}
+criterion_main!(benches);