Inefficient Database Access, Inefficien Pool usage and Sizing, Bad Synchronization, Bad Web Page Design - these are the problems that crash .NET Apps. Learn how to analyze them and fix these problems

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Four Practices for Fixing
Your Top .NET Performance
Problems

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• Top Problems I’ve seen in the years thanks to http://bit.ly/sharepurepath
• How to
• Instrument ASP.NET, IIS and Common Mistakes
• Process Performance Analysis:
• CPU, Memory & Thread Hotspots
• Monitoring through Windows Performance Counters
• Application Performance Analysis
• Error, Exception and Log Analysis
• Database Hotspots: SQL + Bind Values, Connection Pool Information
• Method Hotspots, Synchronous vs Asynchronous Executions
• Monitoring Thread Pools and Other Queues using JMX
• Live Q&A
Agenda for Today

3. WHERE? HOW?
WHAT?
HOW?
WHAT?

4. Browser Issue?
Bandwidth Issue? OS Issue?
Geo Issue?Why Frustrated?

6. Beautiful but
Heavy Pages

8. 32! JavaScript files
5MB! In Size
W3C Resource
Timings!

9. #1: # of Resources
#2: Total Page Size
#3: Involved Domains

10. 10 @Dynatrace

11. Too Many Queries
crash
Undersized Pools

12. Online Banking: Slow Balance Check
1.69m (=101s!) To
Check Balance!
87% spent in IIS 600! SQL Executions

13. #1 Time really spent in IIS?
Tip: Elapsed Time tells us WHEN a
Method was executed!
Finding: Thread 32 in IIS waited 87s to
pass control to Thread 30 in ASP.NET
Tip: Thread# gives us insight on
Thread Queues / Switches

14. #2 What about these SQL Executions?
Finding: EVERY SQL
statement is executed on
ITS OWN Connection!
Tip: Look at
“GetConnection”

15. #2 SQL Executions! continued …
#1: Same SQL is executed 67! times
#2: NO PREPARATION
because everything
executed on new
Connection

16. Lessons Learned!
ASP.NET Worker
Thread Pool Sizing!
DB Connection Pools
More Efficient SQL

17. #1: Idle vs. Busy Threads
#2: # SQLs / Request
#3: # GetConnection

19. Bad
Synchronization

20. Load vs. Memory vs Response Time vs. Threads
Increasing Memory
Avg Response Time:
Increases over Time
Max Response Time
correlates with # Threads
Max Response Time
correlates with # Threads
Load: System can’t handle
constant load over time
# of Worker Threads
increase with constant load
Layer Breakdown:
Performance Problem is in
their own code (Sync Time)

21. 96% Synchronization Time
Monitor.Enter: By far biggest
performance contributor
Called from GetStatus and
_GetDebugStatus. Why also
from Debug method? Bug?

22. Excessive File Attribute Access second hotspot
Can FileExist check
be cached to reduce
File Access?
File Access next hotspots

23. #1: # of Threads vs #
Incoming Requests
#2: Time Spent in Sync
#3: Time Spent in I/O

25. @Dynatrace
• Get Dynatrace Personal License: http://bit.ly/dtpersonal
• Download and Install from: http://bit.ly/dttrial
• Watch the YouTube Tutorials: http://bit.ly/dttutorials
• 2 Steps for Instrumenting .NET and IIS Agent
• .NET Agent Configuration Tool to configure ASP.NET AppPool
• Load Dynatrace IIS Web Server Agent Module
• GO! Launch Your App! Analyze Results!
Instrumenting ASP.NET & IIS

26. @Dynatrace
• IIS not restarted after Agent Installation
• IIS only loads AppPool when you access website
• Loading 64bit instead of 32Bit Agent IIS Module
• Firewall or DNS issues to YOURDTCOLLECTOR:9998
• Wrong TIERNAME leading to „Agent didnt match System
Profile“
Most Common Mistakes

27. @Dynatrace
Demo
Instrumenting an ASP.NET Application

28. @Dynatrace
Demo
Analyze Application Performance

29. @Dynatrace
• Meetups and User Groups: We are happy to present!
• Feb 2016: SAP hybris Summit, Chef Seattle, Docker Meetup San Mateo, DT
User Group in Pittsburgh and Cleveland …
• Mar 2016: Zurich (Testing Day + Java Meetup), DevConf South Africa, DT User
Groups in Detroit, Columbus and New York City
• April 2016: STPCon, DT User Group in San Mateo
• YouTube Channel: http://bit.ly/dttutorials
• Dynatrace Personal: http://bit.ly/dtpersonal
• Contact: agrabner@dynatrace.com
• Share Your PurePath: http://bit.ly/sharepurepath
Reminders

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