3 files changed, 176 insertions, 0 deletions
diff --git a/bench_util/src/js_runtime.rs b/bench_util/src/js_runtime.rs
new file mode 100644
index 000000000..701849b5a
--- /dev/null
+++ b/bench_util/src/js_runtime.rs
@@ -0,0 +1,89 @@
+use bencher::Bencher;
+use deno_core::v8;
+use deno_core::JsRuntime;
+
+use crate::profiling::is_profiling;
+
+pub fn create_js_runtime(setup: impl FnOnce(&mut JsRuntime)) -> JsRuntime {
+  let mut rt = JsRuntime::new(Default::default());
+
+  // Setup bootstrap namespace
+  rt.execute("bootstrap", "globalThis.__bootstrap = {};")
+    .unwrap();
+
+  // Caller provided setup
+  setup(&mut rt);
+
+  // Init ops
+  rt.execute(
+    "init",
+    r#"
+      Deno.core.ops();
+      Deno.core.registerErrorClass('Error', Error);
+    "#,
+  )
+  .unwrap();
+
+  rt
+}
+
+fn loop_code(iters: u64, src: &str) -> String {
+  format!(r#"for(let i=0; i < {}; i++) {{ {} }}"#, iters, src,)
+}
+
+pub fn bench_js_sync(
+  b: &mut Bencher,
+  src: &str,
+  setup: impl FnOnce(&mut JsRuntime),
+) {
+  let mut runtime = create_js_runtime(setup);
+  let context = runtime.global_context();
+  let scope = &mut v8::HandleScope::with_context(runtime.v8_isolate(), context);
+
+  // Increase JS iterations if profiling for nicer flamegraphs
+  let inner_iters = 1000 * if is_profiling() { 10000 } else { 1 };
+  // Looped code
+  let looped_src = loop_code(inner_iters, src);
+
+  let code = v8::String::new(scope, looped_src.as_ref()).unwrap();
+  let script = v8::Script::compile(scope, code, None).unwrap();
+
+  // Run once if profiling, otherwise regular bench loop
+  if is_profiling() {
+    script.run(scope).unwrap();
+  } else {
+    b.iter(|| {
+      script.run(scope).unwrap();
+    });
+  }
+}
+
+pub fn bench_js_async(
+  b: &mut Bencher,
+  src: &str,
+  setup: impl FnOnce(&mut JsRuntime),
+) {
+  let mut runtime = create_js_runtime(setup);
+  let tokio_runtime = tokio::runtime::Builder::new_current_thread()
+    .enable_all()
+    .build()
+    .unwrap();
+
+  // Looped code
+  let looped = loop_code(1000, src);
+  let src = looped.as_ref();
+
+  if is_profiling() {
+    for _ in 0..10000 {
+      runtime.execute("inner_loop", src).unwrap();
+      let future = runtime.run_event_loop();
+      tokio_runtime.block_on(future).unwrap();
+    }
+  } else {
+    b.iter(|| {
+      runtime.execute("inner_loop", src).unwrap();
+      let future = runtime.run_event_loop();
+      tokio_runtime.block_on(future).unwrap();
+    });
+  }
+}
diff --git a/bench_util/src/lib.rs b/bench_util/src/lib.rs
new file mode 100644
index 000000000..41aaf4004
--- /dev/null
+++ b/bench_util/src/lib.rs
@@ -0,0 +1,6 @@
+mod js_runtime;
+mod profiling;
+
+pub use bencher;
+pub use js_runtime::*;
+pub use profiling::*; // Exports bench_or_profile! macro
diff --git a/bench_util/src/profiling.rs b/bench_util/src/profiling.rs
new file mode 100644
index 000000000..498c70b9c
--- /dev/null
+++ b/bench_util/src/profiling.rs
@@ -0,0 +1,81 @@
+use bencher::{DynBenchFn, StaticBenchFn, TestDescAndFn, TestOpts};
+
+pub fn is_profiling() -> bool {
+  std::env::var("PROFILING").is_ok()
+}
+
+#[macro_export]
+// Tweaked and copied from https://github.com/bluss/bencher/blob/master/macros.rs
+macro_rules! bench_or_profile {
+  ($($group_name:path),+) => {
+    fn main() {
+      use $crate::bencher::TestOpts;
+      use $crate::bencher::run_tests_console;
+      let mut test_opts = TestOpts::default();
+      // check to see if we should filter:
+      if let Some(arg) = ::std::env::args().skip(1).find(|arg| *arg != "--bench") {
+          test_opts.filter = Some(arg);
+      }
+      let mut benches = Vec::new();
+      $(
+          benches.extend($group_name());
+      )+
+
+      if $crate::is_profiling() {
+        // Run profling
+        $crate::run_profiles(&test_opts, benches);
+      } else {
+        // Run benches
+        run_tests_console(&test_opts, benches).unwrap();
+      }
+    }
+  };
+  ($($group_name:path,)+) => {
+      bench_or_profile!($($group_name),+);
+  };
+}
+
+pub fn run_profiles(opts: &TestOpts, tests: Vec<TestDescAndFn>) {
+  let tests = filter_tests(opts, tests);
+  // let decs = tests.iter().map(|t| t.desc.clone()).collect();
+
+  println!();
+  for b in tests {
+    println!("Profiling {}", b.desc.name);
+    run_profile(b);
+  }
+  println!();
+}
+
+fn run_profile(test: TestDescAndFn) {
+  match test.testfn {
+    DynBenchFn(bencher) => {
+      bencher::bench::run_once(|harness| bencher.run(harness));
+    }
+    StaticBenchFn(benchfn) => {
+      bencher::bench::run_once(|harness| benchfn(harness));
+    }
+  };
+}
+
+// Copied from https://github.com/bluss/bencher/blob/master/lib.rs
+fn filter_tests(
+  opts: &TestOpts,
+  tests: Vec<TestDescAndFn>,
+) -> Vec<TestDescAndFn> {
+  let mut filtered = tests;
+
+  // Remove tests that don't match the test filter
+  filtered = match opts.filter {
+    None => filtered,
+    Some(ref filter) => filtered
+      .into_iter()
+      .filter(|test| test.desc.name.contains(&filter[..]))
+      .collect(),
+  };
+
+  // Sort the tests alphabetically
+  filtered.sort_by(|t1, t2| t1.desc.name.cmp(&t2.desc.name));
+
+  filtered
+}