Performance Forensics - Understanding Application Performance
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An introduction to performance measurement and diagnosis
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Performance Forensics - Understanding Application Performance
- 1. Performance Forensics Alois Reitbauer dynaTrace Software
- 2. Forensics forensisadj - "of or before the forum." In Roman times, a criminal charge meant presenting the case before a group of public individuals in the forum. … The individual with the best argument and delivery would determine the outcome of the case.
- 4. What does this chart tell us Response Time Time
- 5. A- Response time problem? B - CPU problem? C - Sync problem? D - Database problem?
- 7. We have to collect our evidence first
- 8. Multi-Layered Measurement User-Level Application-Level Container/App Server-Level System/OS/Virtualization-Level
- 9. Understandyourmeasurements Response Time and GC Response Time only
- 10. How can this happen? A: Our response time is 2.3 seconds B: Our response time is 1.5 seconds C: Our response time is 6 seconds
- 11. The beauty of measures ... Page Load Time HTTP Request Time 95 % Servlet Time NetworkSniffer Browser Web Server Firewall Application Server Request Time (max) ... is that there are so many to choose from
- 12. Types of Measurements Cyclic Measurements Are collected ar regular time intervals Are time based JMX, CPU, Memory Event-based measurements Are collected as a request occurs Are transactional Response Times, CPU consumption
- 13. Types of Statistics Min/Max Average Median Percentiles Use percentiles for event-based measures and averages (or max) for cyclical measures
- 14. How you measure is important
- 15. Typical Measurements we work with Memory Consumption, GC CPU Usage, Load Average Response Time Transactions Database Statements, Pool Sizes Communication Calls, Latency, Size, Threads
- 17. What is the problem? We have response times of 6 seconds. We have response times of 6 seconds for 95 percent of our users at a load of 500 users with a CPU utilization of 10 percent.
- 19. Don‘t trust your assumptions
- 20. Top 10 Optimizations are bad
- 24. Make the problem reproducable. Otherwise you cannot check whether you fixed it.
- 25. When are we done?
- 26. ... when there are no more why questions
- 27. Solving the case
- 28. Ensure you solved the real problem
- 29. Fight problems not symptoms
- 30. When a measure supports a problem. Check for all measures affected by the problem.
- 31. Have you tuned at the right place
- 32. Watch out for side effects
- 34. Memory and GC State Handling Data Volume Web Tier Database Number of Requests JavaScript Latency Data Volume Rendering Comm. Behavior Business Tier O/R Access Memory and GC Browser
- 35. Remoting Stack Application Developers View Client Application Server Application Stub Facade Serialization Deserialisation Client Infrastructure Server Infrastructure Networking Networking
- 37. Create Data Locality Reduce Interactions Avoid Protocol Overhead Adjust Interfaces
- 38. The DB layer Application Application Code O/RMapping Layer Caching Layer SQLTCP/IP Result Set Statement Connection Connection Database ConnectionPool PreparedStatement . . . PreparedStatement
- 39. Caching in the DB layer Cross SessionCache Session Caches QueryCache(s) Execution PlanCache Prepared StatementCache Database PersistenceFramework JDBCLayer
- 40. Tune LoadingBehavior Optimizeforcaching select … from a,b,c select … from b,c,a … join fetch …. Reduce DB Calls Define Proper Entities
- 41. The Web Layer
- 42. HighDatavolume Thread-/ Connectionpools HTML Rendering HighLatency DatabaseAccess Network WebService/Backend Calls Many AJAX/HTTP calls Server Browser Browser Browser JavaScriptPerformance
- 43. Caching on the Web Serverside Data Cache Server providingCaching Information Cache per Client Server Proxy Cache for Many Clients Clients
Editor's Notes
- When there is a murder, suspicious fire or hit-and-run accident, police and rescue workers aren't the only ones in on the investigation. Forensic scientists also play an important part. They will take samples collected at the scene and analyze them in a forensics laboratory. With a little ingenuity and some very high-tech equipment, forensic scientists can help law enforcement catch even the wiliest perpetrator.Forensic science is a discipline that applies scientific analysis to the justice system, often to help prove the events of a crime. Forensic scientists analyze and interpret evidence found at the crime scene. That evidence can include blood, saliva, fibers, tire tracks, drugs,alcohol, paint chips and firearm residue.
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