Advanced Performance Forensics
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- Amy Miller
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1 Advanced Performance Forensics Uncovering the Mysteries of Performance and Scalability Incidents through Forensic Engineering Stephen Feldman Senior Director Performance Engineering and Architecture
2 Sessions Goals The goals of today s session are Introduce the practice of performance forensics. Present an argument for session level analysis. Discuss the difference between Resources and Interfaces. Present tools that can be used for performance forensics at different layers of the architectural stack and the client layer.
3 Definition of Performance Forensics The practice of collecting evidence, performing interviews and modeling for the purpose of root cause analysis of a performance or scalability problem. In context of a performance (response time problem) Discussing an individual event (session experience) Performance problems can be classified in two main categories: Response Time Latency Queuing Latency
4 Performance Forensics Methodology Identify the Problem Develop a Problem Statement Identify the Most Important Operations that Affect Your Business Interviewing Collecting Evidence Formulate a Hypothesis Data Analysis Establish a Diagnosis Modeling and Visualizing Sampling and Simulating Perform Session Inspection Method-R Turn the Problem Statement into a Diagnosis to Get to Root Cause Root Cause
5 Putting Performance Forensics in Context Emphasis on the user and the user s actions and experiences. How can this be measured? Capture the response time experience and the response time expectations of the user. Put into perspective user action in-line with the goals of Method-R (what s most important to the business) Identify the contributors of response latency Everyone needs to be involved
6 Measuring the Session When should this happen? When a problem statement cannot be developed from the data you do have (evidence or interviews) and more data needs to be collected. How should you go about this? Want to minimize disruption to the production environment. Adaptive collection: Less Intensive to More Intensive over time. Basic Sampling Continuous Collection Profiling
7 Resources vs. Interfaces One of the most critical data points to collect Interfaces are critical for understanding throughput and queuing models. Queuing is another cause of latency Also a cause of time-outs Resources are critical for understanding the cost of performing a transaction. Core Resources: CPU, Memory and I/O Response Time = Service Time + Queue Time
8 The Importance of Wait Events Rise of Session Level Forensics Underlying theme with all of these tools that Session is more important then System Wait event tuning used to account for latency Exists in SQL Server (Waits and Queues) and Oracle (10046) Other components not mature enough to represent Waits are statistical explanations of latency Each individual wait event might be deceiving, but looking at both aggregates and outliers can explain why a performance problem exists. When sampling directly, usually only have about 1 hour to act on the data.
9 Performance Forensics Tools
10 Categories of Tools HTTP and User Experience JVM Instrumentation Tools Database Instrumentation Session and Wait Event Cost Execution Plans Profilers
11 Breaking Down Latency
12 Fiddler2 Fiddler 2 measures end-to-end client responsiveness of a web request. Little to no overhead (less intrusive forensics) Captures requests in order to present http codes, size of objects, sequence of loading, time to process request, performance by bandwidth speed. Rough estimation of User Experience based on locality. Inspects every detail of the http request Detailed session inspection Breakdown of http transformation Other Tools in Category: Y-slow/Firebug, Charlesproxy, livehttpheaders and IEInspector
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14 Coradiant Truesight Commercial tool used for passive user experience monitoring. Captures page, object and session level data. Capable of defining Service Level Thresholds and Automatic Incident Management. Used to trace back session as if you were watching over the user s shoulder. Exceptional tool for trend analysis. (Less Intrusive) Primarily used in forensics as evidence for analysis. Other Tools in the Category: Quest User Experience and Citrix EdgeSight
15 Coradiant Truesight
16 Coradiant Truesight
17 Log Analyzers Both commercial and open source tools are available to parse and analyze http access logs. Provides trend data, client statistical data, http summary information. Recommend using this data to study request and bandwidth trends for correlation purposes with resource utilization graphs. Such a large volume of data. Recommend working within small time slices Post-processing tool (No Impact to Application) Examples: Urchin, Summary, WebTrends, SawMill, Surfstats and AlterWind Log Analyzer
18 JSTAT Low intrusive statistic collector that provides Percentages of usage by each region Frequency/Counts of collections Time spent in pause state Can be invoked any time without restarting the JVM by obtaining the Process ID Exception is on Windows when the JVM is run as a background service Critical for understanding windows of stall times between sampling Assume you collect every 5 seconds and observe a 3 second pause time Means the application could only work for 2 seconds
19 JSTAT
20 Process of Garbage Collection
21 Process of Garbage Collection
22 -VerboseGC and -Xloggc JVM flags that invoke JVM logging Verbose JVM logging is a low-overhead collector (less intrusive measurement) Requires a restart of the instance to run -XX:+PrintGCDetails is a recommended setting to be used with: -XX:+PrintGCApplicationConcurrentTime -XX:+PrintGCApplicationStoppedTime Provides aggregate statistics about Pause Times versus Working Times.
23 -VerboseGC and -Xloggc
24 IBM Pattern Modeling Tool for Java GC Post processing tool used for visualizing a VerboseGC or Xloggc file. Can make the analysis efforts for analyzing a log file substantially easier. Represents pauses/stalls at particular times Has no affect on the application environment as it reads a log file that is dormant.
25 IBM Pattern Modeling Tool for Java GC
26 JHAT, JMAP and SAP Memory Analyzer Jhat: Java Heap Analysis Tool takes a heap dump and parses the data into useful and human-digestible information about what's in the JVM's memory. JMap: Java Memory Map is a JVM tool that provides information about what is in the heap at a given time. Provides text and OQL views into JHat data SAP Memory Analyzer will visualize the JHat output Should be run when a problem is occurring right now When the system is unresponsive When the JVM runs into continuous collections
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28 ASH ASH: Active Session History Samples session activity in the system every second. 1 hour of history in memory for immediate access at your fingertips ASH in Memory Collects active session data only History v$session_wait + v$session + extras Circular Buffer - 1M to 128M (~2% of SGA) Flushed every hour to disk or when buffer 2/3 full (it protects itself so you can relax) Tools to Consider: SessPack and SessSnaper
29 SQL Server Performance Dashboard Feature of SQL Server 2005 SP2 Template report that take advantage of DMVs Provides views into wait events Doesn t link events to SQL IDs in the report Provides aggregate views of wait events Session Level DMVs (sys.dm_os_wait_stats and sys.dm_exec_sessions) Complimentary Tools: SQL Server Health and History Tool and Quest Spotlight for SQL Server
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31 Importance of Cost Execution Plans Can be run on databases with low overhead Do not need the literal values to run Both SQL Server and Oracle can run Estimated Cost Plans Each database uses an Optimizer that determines the best path of execution of SQL Calculates IO, CPU and Number of Executes (Loop Conditions) Understanding cost operations on a particular object can help change your tuning strategy (ex: TABLE ACCESS BY INDEX ROWID) Cost is time Query cost refers to the estimated elapsed time, in seconds, required to complete a query on a specific hardware configuration.
32 RML and Profiler The RML utilities process SQL Server trace files and view reports showing how SQL Server is performing. Which application, database or login is using the most resources, and which queries are responsible for that. Whether there were any plan changes for a batch during the time when the trace was captured and how each of those plans performed. What queries are running slower in today's data compared to a previous set of data Profiler captures statements, query counts/statistics, wait events Can capture and correlate profile data to Perfmon data Heavy overhead with both Other Tools to Consider: Quest Performance Analysis for SQL Server
33 Oracle OEM and Oracle finally delivered with OEM with a web-based interface. Performance dashboard provides great historical and present overview Access to ADDM and ASH simplifies job of DBA SQL History Problems licensing somewhat cost prohibitive Still doesn t provide wait events For still need to consider profiling on your own and using a profiler reader like Hotsos P4. Difficult to trace and capture sessions
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35 Want More? Check-out my blog for postings of the presentation: To view my resources and references for this presentation, visit Simply click Advanced Search and search by and tag: bbworld08 or forensics
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