Fix interp PGO WBT

Author: kg

src/mono/wasm/Wasm.Build.Tests/TestAppScenarios/InterpPgoTests.cs

@@ -28,9 +28,9 @@ public InterpPgoTests(ITestOutputHelper output, SharedBuildPerTestClassFixture b
     [InlineData("Release")]
     public async Task FirstRunGeneratesTableAndSecondRunLoadsIt(string config)
     {
-        // We need to invoke Greeting enough times to cause BCL code to tier so we can exercise interpreter PGO
+        // We need to invoke Random enough times to cause BCL code to tier so we can exercise interpreter PGO
         // Invoking it too many times makes the test meaningfully slower.
-        const int iterationCount = 70;
+        const int iterationCount = 50;
 
         _testOutput.WriteLine("/// Creating project");
         CopyTestAsset("WasmBasicTestApp", "InterpPgoTest", "App");
@@ -61,13 +61,13 @@ public async Task FirstRunGeneratesTableAndSecondRunLoadsIt(string config)
             lock (runner.OutputLines)
                 output = string.Join(Environment.NewLine, runner.OutputLines);
 
-            Assert.Contains("Hello, World!", output);
+            Assert.Contains("I filled a buffer with random items", output);
             // Verify that no PGO table was located in cache
             Assert.Contains("Failed to load interp_pgo table", output);
             // Verify that the table was saved after the app ran
             Assert.Contains("Saved interp_pgo table", output);
             // Verify that a specific method was tiered by the Greeting calls and recorded by PGO
-            Assert.Contains("added System.Runtime.CompilerServices.Unsafe:Add<byte> (byte&,int) to table", output);
+            Assert.Contains(" System.Random:Next () to table", output);
         }
 
         {
@@ -81,7 +81,7 @@ public async Task FirstRunGeneratesTableAndSecondRunLoadsIt(string config)
             lock (runner.OutputLines)
                 output = string.Join(Environment.NewLine, runner.OutputLines);
 
-            Assert.Contains("Hello, World!", output);
+            Assert.Contains("I filled a buffer with random items", output);
             // Verify that table data was loaded from cache
             // if this breaks, it could be caused by change in config which affects the config hash and the cache storage hash key
             Assert.Contains(" bytes of interp_pgo data (table size == ", output);
@@ -90,7 +90,7 @@ public async Task FirstRunGeneratesTableAndSecondRunLoadsIt(string config)
             // Verify that method(s) were found in the table and eagerly tiered
             Assert.Contains("because it was in the interp_pgo table", output);
             // Verify that a specific method was tiered by the Greeting calls and recorded by PGO
-            Assert.Contains("added System.Runtime.CompilerServices.Unsafe:Add<byte> (byte&,int) to table", output);
+            Assert.Contains(" System.Random:Next () to table", output);
         }
 
         _testOutput.WriteLine("/// Done");

src/mono/wasm/testassets/WasmBasicTestApp/App/InterpPgoTest.cs

@@ -12,10 +12,15 @@ public partial class InterpPgoTest
     internal static partial string GetHRef();
 
     [JSExport]
-    internal static string Greeting()
+    internal static void TryToTier(int iterationCount)
     {
-        var text = $"Hello, World! Greetings from {GetHRef()}";
+        var buffer = new int[4096];
+        var random = new Random();
+        for (int i = 0; i < iterationCount; i++) {
+            for (int j = 0; j < buffer.Length; j++)
+                buffer[j] = random.Next();
+        }
+        var text = $"Greetings from {GetHRef()}. I filled a buffer with random items {iterationCount} times.";
         Console.WriteLine(text);
-        return text;
     }
 }

src/mono/wasm/testassets/WasmBasicTestApp/App/wwwroot/main.js

@@ -130,10 +130,8 @@ try {
                     }
                 }
             });
-            const iterationCount = params.get("iterationCount") ?? 70;
-            for (let i = 0; i < iterationCount; i++) {
-                exports.InterpPgoTest.Greeting();
-            };
+            const iterationCount = params.get("iterationCount") ?? "70";
+            exports.InterpPgoTest.TryToTier(parseInt(iterationCount));
             await INTERNAL.interp_pgo_save_data();
             exit(0);
             break;