Try to find memory usage in LibraryImportTests

eng/testing/xunit/xunit.console.targets

@@ -14,7 +14,7 @@
   <ItemGroup>
     <!-- Configures xunit to not print out passing tests with output when diagnostic messages are enabled. -->
     <SetScriptCommands Condition="'$(TargetOS)' == 'windows'" Include="set XUNIT_HIDE_PASSING_OUTPUT_DIAGNOSTICS=1" />
-    <SetScriptCommands Condition="'$(TargetOS)' != 'windows'" Include="export XUNIT_HIDE_PASSING_OUTPUT_DIAGNOSTICS=1" />
+    <!-- <SetScriptCommands Condition="'$(TargetOS)' != 'windows'" Include="export XUNIT_HIDE_PASSING_OUTPUT_DIAGNOSTICS=1" /> -->
   </ItemGroup>
 
   <PropertyGroup Condition="'$(BundleXunitRunner)' == 'true'">

src/libraries/System.Runtime.InteropServices/tests/LibraryImportGenerator.Tests/ArrayTests.cs

@@ -8,6 +8,7 @@
 using System.Runtime.InteropServices.Marshalling;
 using SharedTypes;
 using Xunit;
+using Xunit.Abstractions;
 
 namespace LibraryImportGenerator.IntegrationTests
 {
@@ -184,6 +185,11 @@ public static partial BoolStruct[] NegateBools(
 
     public class ArrayTests
     {
+        public ArrayTests(ITestOutputHelper output)
+        {
+            PrintTopHelper.PrintOutputOfTopCommand(output);
+        }
+
         private int[] GetIntArray() => new[] { 1, 5, 79, 165, 32, 3 };
 
         [Fact]

src/libraries/System.Runtime.InteropServices/tests/LibraryImportGenerator.Tests/BlittableStructTests.cs

@@ -6,6 +6,7 @@
 using SharedTypes;
 
 using Xunit;
+using Xunit.Abstractions;
 
 namespace LibraryImportGenerator.IntegrationTests
 {
@@ -45,7 +46,7 @@ public static partial class IntStructExtensions
     {
         [LibraryImport(NativeExportsNE.NativeExportsNE_Binary, EntryPoint = "blittablestructs_return_instance")]
         public static partial IntFields DoubleIntFields(this IntFields result);
-        
+
         [LibraryImport(NativeExportsNE.NativeExportsNE_Binary, EntryPoint = "blittablestructs_double_intfields_refreturn")]
         public static partial void DoubleIntFieldsOutReturn(
             this IntFields input,
@@ -54,6 +55,11 @@ public static partial void DoubleIntFieldsOutReturn(
 
     public class BlittableStructTests
     {
+        public BlittableStructTests(ITestOutputHelper output)
+        {
+            PrintTopHelper.PrintOutputOfTopCommand(output);
+        }
+
         [Fact]
         public void ValidateIntFields()
         {

src/libraries/System.Runtime.InteropServices/tests/LibraryImportGenerator.Tests/BooleanTests.cs

@@ -6,6 +6,7 @@
 using System.Runtime.InteropServices;
 
 using Xunit;
+using Xunit.Abstractions;
 
 namespace LibraryImportGenerator.IntegrationTests
 {
@@ -71,6 +72,11 @@ partial class NativeExportsNE
 
     public class BooleanTests
     {
+        public BooleanTests(ITestOutputHelper output)
+        {
+            PrintTopHelper.PrintOutputOfTopCommand(output);
+        }
+
         // See definition of Windows' VARIANT_BOOL
         const ushort VARIANT_TRUE = unchecked((ushort)-1);
         const ushort VARIANT_FALSE = 0;

src/libraries/System.Runtime.InteropServices/tests/LibraryImportGenerator.Tests/CollectionMarshallingFails.cs

@@ -7,6 +7,7 @@
 using System.Runtime.InteropServices.Marshalling;
 using SharedTypes;
 using Xunit;
+using Xunit.Abstractions;
 
 namespace LibraryImportGenerator.IntegrationTests
 {
@@ -109,6 +110,11 @@ public static partial void NegateBoolsRef2D_ClearMarshalling(
 
     public class CollectionMarshallingFails
     {
+        public CollectionMarshallingFails(ITestOutputHelper output)
+        {
+            PrintTopHelper.PrintOutputOfTopCommand(output);
+        }
+
         [Fact]
         public void UTFStringConversionFailures()
         {

src/libraries/System.Runtime.InteropServices/tests/LibraryImportGenerator.Tests/CollectionTests.cs

@@ -11,6 +11,7 @@
 using System.Text;
 
 using Xunit;
+using Xunit.Abstractions;
 
 namespace LibraryImportGenerator.IntegrationTests
 {
@@ -192,6 +193,11 @@ public void Free() { }
 
     public class CollectionTests
     {
+        public CollectionTests(ITestOutputHelper output)
+        {
+            PrintTopHelper.PrintOutputOfTopCommand(output);
+        }
+
         [Fact]
         public void BlittableElementColllection_ByValue()
         {

src/libraries/System.Runtime.InteropServices/tests/LibraryImportGenerator.Tests/CustomMarshallingTests.cs

@@ -9,6 +9,7 @@
 using SharedTypes;
 
 using Xunit;
+using Xunit.Abstractions;
 
 namespace LibraryImportGenerator.IntegrationTests
 {
@@ -119,6 +120,11 @@ public void Free() {}
 
     public class CustomMarshallingTests
     {
+        public CustomMarshallingTests(ITestOutputHelper output)
+        {
+            PrintTopHelper.PrintOutputOfTopCommand(output);
+        }
+
         [Fact]
         public void NonBlittableStructWithFree()
         {

src/libraries/System.Runtime.InteropServices/tests/LibraryImportGenerator.Tests/DelegateTests.cs

@@ -4,6 +4,7 @@
 using System.Runtime.InteropServices;
 
 using Xunit;
+using Xunit.Abstractions;
 
 namespace LibraryImportGenerator.IntegrationTests
 {
@@ -22,6 +23,11 @@ partial class NativeExportsNE
 
     public class DelegateTests
     {
+        public DelegateTests(ITestOutputHelper output)
+        {
+            PrintTopHelper.PrintOutputOfTopCommand(output);
+        }
+
         [Fact]
         public void DelegateIsKeptAliveDuringCall()
         {

src/libraries/System.Runtime.InteropServices/tests/LibraryImportGenerator.Tests/FunctionPointerTests.cs

@@ -6,6 +6,7 @@
 using System.Runtime.InteropServices;
 
 using Xunit;
+using Xunit.Abstractions;
 
 namespace LibraryImportGenerator.IntegrationTests
 {
@@ -35,6 +36,11 @@ public partial class FunctionPointer
 
     public class FunctionPointerTests
     {
+        public FunctionPointerTests(ITestOutputHelper output)
+        {
+            PrintTopHelper.PrintOutputOfTopCommand(output);
+        }
+
         private static bool wasCalled;
 
         [Fact]

src/libraries/System.Runtime.InteropServices/tests/LibraryImportGenerator.Tests/PrintTop.cs

@@ -0,0 +1,32 @@
+
+using System;
+using Xunit.Abstractions;
+
+internal class PrintTopHelper
+{
+    public static void PrintOutputOfTopCommand(ITestOutputHelper output)
+    {
+        if (Environment.OSVersion.Platform == PlatformID.Unix)
+        {
+            // grab the output of the `top` command to get the memory usage
+            // and CPU usage of the process
+            var process = new System.Diagnostics.Process
+            {
+                StartInfo = new System.Diagnostics.ProcessStartInfo
+                {
+                    FileName = "top",
+                    Arguments = "-b -n 1",
+                    RedirectStandardOutput = true,
+                    UseShellExecute = false,
+                    CreateNoWindow = true
+                }
+            };
+
+            process.Start();
+            string outputText = process.StandardOutput.ReadToEnd();
+            process.WaitForExit();
+
+            output.WriteLine(outputText);
+        }
+    }
+}

src/libraries/System.Runtime.InteropServices/tests/LibraryImportGenerator.Tests/SafeHandleTests.cs

@@ -5,6 +5,7 @@
 
 using Microsoft.Win32.SafeHandles;
 using Xunit;
+using Xunit.Abstractions;
 
 namespace LibraryImportGenerator.IntegrationTests
 {
@@ -49,6 +50,11 @@ protected override bool ReleaseHandle()
 
     public class SafeHandleTests
     {
+        public SafeHandleTests(ITestOutputHelper output)
+        {
+            PrintTopHelper.PrintOutputOfTopCommand(output);
+        }
+
         [Fact]
         public void ReturnValue_CreatesSafeHandle()
         {

src/libraries/System.Runtime.InteropServices/tests/LibraryImportGenerator.Tests/SpanTests.cs

@@ -11,6 +11,7 @@
 using System.Text;
 
 using Xunit;
+using Xunit.Abstractions;
 
 namespace LibraryImportGenerator.IntegrationTests
 {
@@ -48,6 +49,11 @@ public partial class Span
 
     public class SpanTests
     {
+        public SpanTests(ITestOutputHelper output)
+        {
+            PrintTopHelper.PrintOutputOfTopCommand(output);
+        }
+
         [Fact]
         public void BlittableElementSpanMarshalledToNativeAsExpected()
         {