add benchmark for full stack request lifecycle

Cargo.toml

@@ -99,6 +99,7 @@ env_logger = "0.6"
 serde_derive = "1.0"
 brotli2 = "0.3.2"
 flate2 = "1.0.13"
+criterion = "0.3"
 
 [profile.release]
 lto = true
@@ -116,3 +117,7 @@ actix-session = { path = "actix-session" }
 actix-files = { path = "actix-files" }
 actix-multipart = { path = "actix-multipart" }
 awc = { path = "awc" }
+
+[[bench]]
+name = "server"
+harness = false

benches/server.rs

@@ -0,0 +1,66 @@
+use actix_web::{web, test, App, HttpResponse};
+use criterion::{criterion_group, criterion_main, Criterion};
+use futures::future::join_all;
+use awc::Client;
+
+const STR: &str = "Hello World Hello World Hello World Hello World Hello World \
+                   Hello World Hello World Hello World Hello World Hello World \
+                   Hello World Hello World Hello World Hello World Hello World \
+                   Hello World Hello World Hello World Hello World Hello World \
+                   Hello World Hello World Hello World Hello World Hello World \
+                   Hello World Hello World Hello World Hello World Hello World \
+                   Hello World Hello World Hello World Hello World Hello World \
+                   Hello World Hello World Hello World Hello World Hello World \
+                   Hello World Hello World Hello World Hello World Hello World \
+                   Hello World Hello World Hello World Hello World Hello World \
+                   Hello World Hello World Hello World Hello World Hello World \
+                   Hello World Hello World Hello World Hello World Hello World \
+                   Hello World Hello World Hello World Hello World Hello World \
+                   Hello World Hello World Hello World Hello World Hello World \
+                   Hello World Hello World Hello World Hello World Hello World \
+                   Hello World Hello World Hello World Hello World Hello World \
+                   Hello World Hello World Hello World Hello World Hello World \
+                   Hello World Hello World Hello World Hello World Hello World \
+                   Hello World Hello World Hello World Hello World Hello World \
+                   Hello World Hello World Hello World Hello World Hello World \
+                   Hello World Hello World Hello World Hello World Hello World";
+
+
+// benchmark sending all requests at the same time
+fn bench_async_burst(c: &mut Criterion) {
+    let srv = test::start(|| {
+        App::new()
+            .service(web::resource("/").route(web::to(|| HttpResponse::Ok().body(STR))))
+    });
+
+    // We are using System here, since Runtime requires preinitialized tokio
+    // Maybe add to actix_rt docs
+    let url = srv.url("/");
+    let mut rt = actix_rt::System::new("test");
+
+    c.bench_function("get_body_async_burst", move |b| 
+        b.iter_custom(|iters| {
+
+            let client = Client::new().get(url.clone()).freeze().unwrap();
+
+            let start = std::time::Instant::now();
+            // benchmark body
+            let resps = rt.block_on(async move {
+                let burst = (0..iters).map( |_| client.send() );
+                join_all( burst ).await
+            });
+            let elapsed = start.elapsed();
+
+            // if there are failed requests that might be an issue
+            let failed = resps.iter().filter(|r| r.is_err()).count();
+            if failed >0 {
+                eprintln!("failed {} requests (might be bench timeout)", failed);
+            };
+
+            elapsed
+        })
+    );
+}
+
+criterion_group!(server_benches, bench_async_burst);
+criterion_main!(server_benches);