feat: dagrunner, initial version

tests/performance/stress.rs

@@ -0,0 +1,105 @@
+//! Stress tests and benchmarks
+
+use crate::common::task_fn;
+use dagx::DagRunner;
+use std::sync::Arc;
+use std::time::{Duration, Instant};
+
+#[tokio::test]
+async fn test_deep_chain_100_levels() {
+    let dag = Arc::new(DagRunner::new());
+
+    // Create a chain 100 levels deep
+    let start = Instant::now();
+    let first = dag.add_task(task_fn(|_: ()| async { 0 }));
+    let mut handles = vec![(&first).into()];
+
+    for _ in 1..=100 {
+        let next = dag
+            .add_task(task_fn(move |x: i32| async move { x + 1 }))
+            .depends_on(handles.last().unwrap());
+        handles.push(next);
+    }
+    let build_time = start.elapsed();
+
+    println!("Built 100-level chain in {:?}", build_time);
+
+    // Execute
+    let start = Instant::now();
+    dag.run(|fut| {
+        tokio::spawn(fut);
+    })
+    .await
+    .unwrap();
+    let exec_time = start.elapsed();
+
+    println!("Executed 100-level chain in {:?}", exec_time);
+    assert!(
+        exec_time < Duration::from_secs(5),
+        "Execution took too long"
+    );
+
+    // Verify result
+    assert_eq!(dag.get(handles.last().unwrap()).unwrap(), 100);
+}
+
+#[tokio::test]
+async fn test_stress_mixed_patterns() {
+    // Stress test with mixed DAG patterns
+    let dag = Arc::new(DagRunner::new());
+    let mut all_tasks = vec![];
+
+    // Add various patterns
+    for i in 0..10 {
+        // Linear chains
+        let first = dag.add_task(task_fn(move |_: ()| async move { i * 1000 }));
+        let mut chain_handles = vec![(&first).into()];
+        for j in 1..10 {
+            let next = dag
+                .add_task(task_fn(move |x: i32| async move { x + j }))
+                .depends_on(chain_handles.last().unwrap());
+            chain_handles.push(next);
+        }
+        all_tasks.push(*chain_handles.last().unwrap());
+
+        // Diamonds
+        let source = dag.add_task(task_fn(move |_: ()| async move { i * 100 }));
+        let source_handle: dagx::TaskHandle<i32> = (&source).into();
+        let left = dag
+            .add_task(task_fn(|x: i32| async move { x * 2 }))
+            .depends_on(source_handle);
+        let right = dag
+            .add_task(task_fn(|x: i32| async move { x * 3 }))
+            .depends_on(source_handle);
+        let merge = dag
+            .add_task(task_fn(|(l, r): (i32, i32)| async move { l + r }))
+            .depends_on((&left, &right));
+        all_tasks.push(merge);
+
+        // Fan-outs
+        let hub = dag.add_task(task_fn(move |_: ()| async move { i }));
+        let hub_handle: dagx::TaskHandle<i32> = (&hub).into();
+        for j in 0..5 {
+            let fan = dag
+                .add_task(task_fn(move |x: i32| async move { x + j * 10 }))
+                .depends_on(hub_handle);
+            all_tasks.push(fan);
+        }
+    }
+
+    // Execute
+    let start = Instant::now();
+    dag.run(|fut| {
+        tokio::spawn(fut);
+    })
+    .await
+    .unwrap();
+    let exec_time = start.elapsed();
+
+    println!("Executed mixed pattern stress test in {:?}", exec_time);
+
+    // Verify some results
+    for task in all_tasks.iter().take(10) {
+        assert!(dag.get(task).is_ok());
+    }
+}