[wasm] Add AppStart task to the bench Sample (#61481)

Measure browser app start times, 2 measurements implemented.

First to measure till the JS window.pageshow event, second to measure
time when we reach managed C# code.

Example ouput:

    | measurement | time |
    |-:|-:|
    |                    AppStart, Page show |   108.1400ms |
    |                AppStart, Reach managed |   240.2174ms |

src/mono/sample/wasm/browser-bench/AppStart.cs

@@ -0,0 +1,88 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System;
+using System.Diagnostics.CodeAnalysis;
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Text.Json;
+using System.Threading.Tasks;
+
+namespace Sample
+{
+    public class AppStartTask : BenchTask
+    {
+        public override string Name => "AppStart";
+        public override bool BrowserOnly => true;
+
+        [DynamicDependency(DynamicallyAccessedMemberTypes.NonPublicConstructors, "System.Runtime.InteropServices.JavaScript.Runtime", "System.Private.Runtime.InteropServices.JavaScript")]
+        static Type jsRuntimeType = System.Type.GetType("System.Runtime.InteropServices.JavaScript.Runtime, System.Private.Runtime.InteropServices.JavaScript", true);
+        static Type jsFunctionType = System.Type.GetType("System.Runtime.InteropServices.JavaScript.Function, System.Private.Runtime.InteropServices.JavaScript", true);
+        [DynamicDependency("InvokeJS(System.String)", "System.Runtime.InteropServices.JavaScript.Runtime", "System.Private.Runtime.InteropServices.JavaScript")]
+        static MethodInfo invokeJSMethod = jsRuntimeType.GetMethod("InvokeJS", new Type[] { typeof(string) });
+        [DynamicDependency(DynamicallyAccessedMemberTypes.PublicConstructors, "System.Runtime.InteropServices.JavaScript.Function", "System.Private.Runtime.InteropServices.JavaScript")]
+        static ConstructorInfo functionConstructor = jsRuntimeType.GetConstructor(new Type[] { typeof(object[]) });
+        [DynamicDependency("Call()", "System.Runtime.InteropServices.JavaScript.Function", "System.Private.Runtime.InteropServices.JavaScript")]
+        static MethodInfo functionCall = jsFunctionType.GetMethod("Call", BindingFlags.Instance | BindingFlags.Public, new Type[] { });
+
+        public AppStartTask()
+        {
+            measurements = new Measurement[] {
+                new PageShow(),
+                new ReachManaged(),
+            };
+        }
+
+        Measurement[] measurements;
+        public override Measurement[] Measurements => measurements;
+
+        static string InvokeJS(string js)
+        {
+            return (string)invokeJSMethod.Invoke(null, new object[] { js });
+        }
+
+        class PageShow : BenchTask.Measurement
+        {
+            public override string Name => "Page show";
+
+            public override int InitialSamples => 3;
+
+            async Task RunAsyncStep()
+            {
+                var function = Activator.CreateInstance(jsFunctionType, new object[] { new object[] { @"return App.StartAppUI();" } });
+                var task = (Task<object>)functionCall.Invoke(function, new object[] { });
+
+                await task;
+            }
+
+            public override bool HasRunStepAsync => true;
+
+            public override async Task RunStepAsync()
+            {
+                var function = Activator.CreateInstance(jsFunctionType, new object[] { new object[] { @"return App.PageShow();" } });
+                await (Task<object>)functionCall.Invoke(function, null);
+            }
+        }
+
+        class ReachManaged : BenchTask.Measurement
+        {
+            public override string Name => "Reach managed";
+            public override int InitialSamples => 3;
+            public override bool HasRunStepAsync => true;
+
+            static object jsUIReachedManagedFunction = Activator.CreateInstance(jsFunctionType, new object[] { new object[] { @"return App.ReachedManaged();" } });
+            static object jsReached = Activator.CreateInstance(jsFunctionType, new object[] { new object[] { @"return App.reached();" } });
+
+            [MethodImpl(MethodImplOptions.NoInlining)]
+            public static void Reached()
+            {
+                functionCall.Invoke(jsReached, null);
+            }
+
+            public override async Task RunStepAsync()
+            {
+                await (Task<object>)functionCall.Invoke(jsUIReachedManagedFunction, null);
+            }
+        }
+    }
+}

src/mono/sample/wasm/browser-bench/BenchTask.cs

@@ -6,7 +6,7 @@
 using System.Text.RegularExpressions;
 using System.Threading.Tasks;
 
-abstract class BenchTask
+public abstract class BenchTask
 {
     public abstract string Name { get; }
     readonly List<Result> results = new();
@@ -18,7 +18,7 @@ public async Task<string> RunBatch(List<Result> results, int measurementIdx, int
     {
         var measurement = Measurements[measurementIdx];
         await measurement.BeforeBatch();
-        var result = measurement.RunBatch(this, milliseconds);
+        var result = await measurement.RunBatch(this, milliseconds);
         results.Add(result);
         await measurement.AfterBatch();
 
@@ -50,27 +50,37 @@ public abstract class Measurement
 
         public virtual Task AfterBatch() { return Task.CompletedTask; }
 
-        public abstract void RunStep();
+        public virtual void RunStep() { }
+        public virtual async Task RunStepAsync() { await Task.CompletedTask; }
+
+        public virtual bool HasRunStepAsync => false;
 
         protected virtual int CalculateSteps(int milliseconds, TimeSpan initTs)
         {
             return (int)(milliseconds * InitialSamples / Math.Max(1.0, initTs.TotalMilliseconds));
         }
 
-        public Result RunBatch(BenchTask task, int milliseconds)
+        public async Task<Result> RunBatch(BenchTask task, int milliseconds)
         {
             DateTime start = DateTime.Now;
             DateTime end;
             int i = 0;
             try
             {
                 // run one to eliminate possible startup overhead and do GC collection
-                RunStep();
+                if (HasRunStepAsync)
+                    await RunStepAsync();
+                else
+                    RunStep();
+
                 GC.Collect();
 
                 start = DateTime.Now;
                 for (i = 0; i < InitialSamples; i++)
-                    RunStep();
+                    if (HasRunStepAsync)
+                        await RunStepAsync();
+                    else
+                        RunStep();
                 end = DateTime.Now;
 
                 var initTs = end - start;
@@ -79,7 +89,10 @@ public Result RunBatch(BenchTask task, int milliseconds)
                 start = DateTime.Now;
                 for (i = 0; i < steps; i++)
                 {
-                    RunStep();
+                    if (HasRunStepAsync)
+                        await RunStepAsync();
+                    else
+                        RunStep();
                 }
                 end = DateTime.Now;
 

src/mono/sample/wasm/browser-bench/Program.cs

@@ -15,8 +15,9 @@ public partial class Test
     {
         List<BenchTask> tasks = new()
         {
+            new AppStartTask(),
             new ExceptionsTask(),
-            new JsonTask (),
+            new JsonTask(),
             new WebSocketTask()
         };
         static Test instance = new Test();

src/mono/sample/wasm/browser-bench/Wasm.Browser.Bench.Sample.csproj

@@ -3,10 +3,14 @@
     <!-- don't need to run this on helix -->
     <WasmCopyAppZipToHelixTestDir>false</WasmCopyAppZipToHelixTestDir>
     <WasmMainJSPath>runtime.js</WasmMainJSPath>
+    <SuppressTrimAnalysisWarnings>true</SuppressTrimAnalysisWarnings>
   </PropertyGroup>
 
   <ItemGroup>
     <WasmExtraFilesToDeploy Include="index.html" />
+    <WasmExtraFilesToDeploy Include="appstart-frame.html" />
+    <WasmExtraFilesToDeploy Include="appstart.js" />
+    <WasmExtraFilesToDeploy Include="style.css" />
     <Compile Remove="Console/Console.cs" />
   </ItemGroup>
 

src/mono/sample/wasm/browser-bench/appstart-frame.html

@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<!--  Licensed to the .NET Foundation under one or more agreements. -->
+<!-- The .NET Foundation licenses this file to you under the MIT license. -->
+<html>
+  <head>
+    <title>App task</title>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  </head>
+  <body>
+    <h3 id="header">Wasm Browser Sample - App task frame</h3>
+    <span id="out"></span>
+    <script type='text/javascript'>
+      var test_exit = function(exit_code)
+      {
+        /* Set result in a tests_done element, to be read by xharness */
+        var tests_done_elem = document.createElement("label");
+        tests_done_elem.id = "tests_done";
+        tests_done_elem.innerHTML = exit_code.toString();
+        document.body.appendChild(tests_done_elem);
+
+        console.log(`WASM EXIT ${exit_code}`);
+      };
+
+      window.addEventListener("pageshow", event => { window.parent.resolveAppStartEvent(event); })
+
+      var App = {
+        init: function () {
+          INTERNAL.call_static_method("[Wasm.Browser.Bench.Sample] Sample.AppStartTask/ReachManaged:Reached");
+        },
+
+        reached: function() {
+          window.parent.resolveAppStartEvent("reached");
+        }
+      };
+
+    </script>
+    <script type="text/javascript" src="runtime.js"></script>
+    <script defer src="dotnet.js"></script>
+  </body>
+</html>

src/mono/sample/wasm/browser-bench/appstart.js

@@ -0,0 +1,31 @@
+var AppStart = {
+  Construct: function() {
+    this._frame = document.createElement('iframe');
+    document.body.appendChild(this._frame);
+  },
+
+  WaitForPageShow: async function() {
+    let promise;
+    let promiseResolve;
+    this._frame.src = 'appstart-frame.html';
+    promise = new Promise(resolve => { promiseResolve = resolve; })
+    window.resolveAppStartEvent = function(event) { promiseResolve(); }
+    await promise;
+  },
+
+  WaitForReached: async function() {
+    let promise;
+    let promiseResolve;
+    this._frame.src = 'appstart-frame.html';
+    promise = new Promise(resolve => { promiseResolve = resolve; })
+    window.resolveAppStartEvent = function(event) {
+      if (event == "reached")
+        promiseResolve();
+    }
+    await promise;
+  },
+
+  RemoveFrame: function () {
+    document.body.removeChild(this._frame);
+  }
+};

src/mono/sample/wasm/browser-bench/index.html

@@ -6,6 +6,7 @@
     <title>TESTS</title>
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <link rel="stylesheet" href="style.css">
   </head>
   <body onload="onLoad()">
     <h3 id="header">Wasm Browser Sample - Simple Benchmark</h3>
@@ -53,10 +54,31 @@ <h3 id="header">Wasm Browser Sample - Simple Benchmark</h3>
           if (tasks != '')
             INTERNAL.call_static_method("[Wasm.Browser.Bench.Sample] Sample.Test:SetTasks", tasks);
           yieldBench ();
+        },
+
+        PageShow: async function ()
+        {
+          AppStart.Construct();
+          try {
+            await AppStart.WaitForPageShow();
+          } finally {
+            AppStart.RemoveFrame();
+          }
+        },
+
+        ReachedManaged: async function ()
+        {
+          AppStart.Construct();
+          try {
+            await AppStart.WaitForReached();
+          } finally {
+            AppStart.RemoveFrame();
+          }
         }
       };
     </script>
     <script type="text/javascript" src="runtime.js"></script>
+    <script type="text/javascript" src="appstart.js"></script>
 
     <script defer src="dotnet.js"></script>
 

src/mono/sample/wasm/browser-bench/runtime.js

@@ -5,24 +5,16 @@
 var Module = {
     config: null,
     configSrc: "./mono-config.json",
-    onConfigLoaded: function () {
-        if (MONO.config.enable_profiler) {
-            MONO.config.aot_profiler_options = {
-                write_at: "Sample.Test::StopProfile",
-                send_to: "System.Runtime.InteropServices.JavaScript.Runtime::DumpAotProfileData"
-            }
-        }
-    },
     onDotNetReady: function () {
         try {
             App.init();
         } catch (error) {
+            console.log("exception: " + error);
             test_exit(1);
             throw (error);
         }
     },
     onAbort: function (err) {
         test_exit(1);
-
     },
 };

src/mono/sample/wasm/browser-bench/style.css

@@ -0,0 +1,3 @@
+iframe {
+    display:none;
+}