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Death of a Web Server Richard Campbell Strangeloop Networks

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Presentation on theme: "Death of a Web Server Richard Campbell Strangeloop Networks"— Presentation transcript:

1 Death of a Web Server Richard Campbell Strangeloop Networks

2 Richard Campbell Background –First laid hands on a microcomputer in 1977, its been downhill since then –Spent the last 15 years helping companies scale applications on a variety of platforms Currently –Co-Founder and Chief Evangelist of Strangeloop Networks –Co-Host of.NET Rocks! –Host of RunAs Radio!

3 Agenda Setting the Stage Testing the Web Site Instrumenting a Web Server Instrumenting and Analyzing Caching Actually Solving the Problem

4 Setting the Stage The Portable Data Center –Load Test Machine –Web Server –Database Server Software –Windows 2008 Server 64 bit –Visual Studio 2008 Test Edition

5 Testing the Web Site Building Good Tests –Know reality! Get log data Different kinds of load tests –Test to failure –Soak test

6 Instrumenting a Web Server Perf Mon is your friend! –CPU Utilization –Requests per Second –Requests Queued –Bytes in the.NET Heap

7 Instrumenting Caching Log every time: –A cache item gets populated –A cache item is destroyed –A cache item gets used

8 Actually Fixing the Problem Don’t cache what doesn’t get reused! Choices: –Don’t cache datasets with unbounded parameters –Bound the parameters

9 Summary Diagnosis is the most challenging part of the process Use facts – instrument everything! Theorize probable cause, then prove it Consider a variety of solutions


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