By the end of this lab, you will be able to:<\/p>\n\n\n\n
\u2714 Launch and use Resource Monitor
\u2714 Analyze CPU, Memory, Disk, and Network usage for a .NET application
\u2714 Identify performance bottlenecks
\u2714 Detect high CPU, memory leaks, disk thrashing, and network issues
\u2714 Use Resource Monitor to troubleshoot real-time .NET app problems<\/p>\n\n\n\n
This lab is hands-on<\/strong>, and every step includes expected results + observations<\/strong>.<\/p>\n\n\n\n Before starting:<\/p>\n\n\n\n If you don\u2019t have one<\/strong>, you can create a quick sample API:<\/p>\n\n\n This will run on: Press:<\/p>\n\n\n OR<\/p>\n\n\n You see an interface with tabs:<\/p>\n\n\n\n Example:<\/p>\n\n\n Look for:<\/p>\n\n\n\n Check these fields:<\/p>\n\n\n\n Use a separate terminal:<\/p>\n\n\n Or use Postman runner.<\/p>\n\n\n\n Right-click your .NET process \u2192 Filter your .NET process.<\/p>\n\n\n\n Look at:<\/p>\n\n\n\n Modify API or run a loop:<\/p>\n\n\n Run load test again.<\/p>\n\n\n\n If Working Set grows continuously without dropping \u2192 possible memory leak.<\/p>\n\n\n\n This is crucial for:<\/p>\n\n\n\n Filter by your dotnet.exe<\/strong> process.<\/p>\n\n\n\n Observe:<\/p>\n\n\n\n Create a .NET endpoint that writes files:<\/p>\n\n\n Call it multiple times:<\/p>\n\n\n Filter by your .NET process.<\/p>\n\n\n\n Observe:<\/p>\n\n\n\n Run:<\/p>\n\n\n
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\ud83e\uddea LAB 0 \u2014 Prerequisites<\/strong><\/h1>\n\n\n\n
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\u2714 Windows 10\/11 or Windows Server<\/h3>\n\n\n\n
\u2714 .NET 6 or .NET 7 runtime installed<\/h3>\n\n\n\n
\u2714 A sample .NET app (API, console, or background worker)<\/h3>\n\n\n\n
dotnet new<\/span> webapi -n DemoApi\ncd DemoApi\ndotnet run\n<\/code><\/span>Code language:<\/span> JavaScript<\/span> (<\/span>javascript<\/span>)<\/span><\/small><\/pre>\n\n\n
http:\/\/localhost:5000<\/a><\/strong> or http:\/\/localhost:5241<\/a><\/strong> (depending on your version)<\/p>\n\n\n\n
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\ud83e\uddea LAB 1 \u2014 Launch Resource Monitor<\/strong><\/h1>\n\n\n\n
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Step 1: Open ResMon<\/strong><\/h3>\n\n\n\n
Win + R \u2192 resmon\n<\/code><\/span><\/pre>\n\n\nCtrl + Shift + Esc \u2192 Task Manager \u2192 Performance \u2192 Open Resource Monitor\n<\/code><\/span><\/pre>\n\n\nExpected Output<\/strong><\/h3>\n\n\n\n
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\ud83e\uddea LAB 2 \u2014 Monitor CPU Usage of .NET App<\/strong><\/h1>\n\n\n\n
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Step 1: Run your .NET application<\/strong><\/h2>\n\n\n\n
dotnet run\n<\/code><\/span><\/pre>\n\n\nStep 2: Open Resource Monitor \u2192 CPU Tab<\/strong><\/h2>\n\n\n\n
Step 3: Filter by the .NET process<\/strong><\/h2>\n\n\n\n
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Step 4: Simulate load<\/strong><\/h3>\n\n\n\n
for<\/span> \/l %i in<\/span> (1<\/span>,1<\/span>,1000<\/span>) do<\/span> curl http:\/\/localhost:5000\/weatherforecast<\/span>\n<\/code><\/span>Code language:<\/span> JavaScript<\/span> (<\/span>javascript<\/span>)<\/span><\/small><\/pre>\n\n\nObserve:<\/strong><\/h3>\n\n\n\n
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Step 5: Analyze Wait Chain for Deadlocks<\/strong><\/h3>\n\n\n\n
Analyze Wait Chain<\/strong><\/p>\n\n\n\nExpected Result<\/strong><\/h3>\n\n\n\n
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\ud83e\uddea LAB 3 \u2014 Memory Analysis for .NET App<\/strong><\/h1>\n\n\n\n
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Step 1: Open Memory tab<\/strong><\/h2>\n\n\n\n
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Step 2: Trigger .NET memory usage<\/strong><\/h2>\n\n\n\n
var<\/span> data = new<\/span> List<\/span><byte[]>();\nfor<\/span>(int i=0<\/span>; i<50000<\/span>; i++)\n{\n data.Add(new<\/span> byte[1024<\/span> * 50<\/span>]); \/\/ 50 KB<\/span>\n}\n<\/code><\/span>Code language:<\/span> PHP<\/span> (<\/span>php<\/span>)<\/span><\/small><\/pre>\n\n\nExpected Observations<\/strong><\/h3>\n\n\n\n
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Step 3: Identify memory leak behavior<\/strong><\/h2>\n\n\n\n
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\ud83e\uddea LAB 4 \u2014 Disk I\/O Analysis for .NET<\/strong><\/h1>\n\n\n\n
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\n\n\n\nStep 1: Open Disk tab<\/strong><\/h2>\n\n\n\n
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\n\n\n\nStep 2: Simulate Disk Load<\/strong><\/h2>\n\n\n\n
[HttpGet(\"write\"<\/span>)]\npublic<\/span> IActionResult WriteDemo()\n{\n System.IO.File.WriteAllText(\"test_\"<\/span> + Guid.NewGuid() + \".txt\"<\/span>, new<\/span> string('A'<\/span>, 1000000<\/span>));\n return<\/span> Ok();\n}\n<\/code><\/span>Code language:<\/span> PHP<\/span> (<\/span>php<\/span>)<\/span><\/small><\/pre>\n\n\nfor<\/span> \/l %i in<\/span> (1<\/span>,1<\/span>,200<\/span>) do<\/span> curl http:\/\/localhost:5000\/write<\/span>\n<\/code><\/span>Code language:<\/span> JavaScript<\/span> (<\/span>javascript<\/span>)<\/span><\/small><\/pre>\n\n\n
\n\n\n\nExpected Observations<\/strong><\/h2>\n\n\n\n
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C:\\path\\yourapp\\test_*.txt<\/code><\/li>\n\n\n\n
\n\n\n\nInterpretation<\/strong><\/h2>\n\n\n\n
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\ud83e\uddea LAB 5 \u2014 Network Analysis for .NET<\/strong><\/h1>\n\n\n\n
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Step 1: Go to Network Tab<\/strong><\/h2>\n\n\n\n
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\n\n\n\nStep 2: Simulate High Network Load<\/strong><\/h2>\n\n\n\n
for<\/span> \/l %i in<\/span> (1<\/span>,1<\/span>,300<\/span>) do<\/span> curl http:\/\/localhost:5000\/weatherforecast<\/span>\n<\/code><\/span>