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Performance Tuning ColdFusion

Before the JVM

Performance Tuning ColdFusion

Before the JVM

Chris Peterson

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Chris PetersonChris PetersonChris PetersonChris Peterson

A. Started ColdFusion development with version 4.5 express

B. Background in SQL and network administration

C. Started working full time for Alagad in January 2009

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ObjectiveObjectiveObjectiveObjective

Discuss a holistic approach to identifying performance issues with ColdFusion applications, using a variety of tools and server observation.

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Don’t waste time JVM tuning a lemonDon’t waste time JVM tuning a lemonDon’t waste time JVM tuning a lemonDon’t waste time JVM tuning a lemon

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Identify the dominant consumerIdentify the dominant consumerIdentify the dominant consumerIdentify the dominant consumer

A. Listen to what your server is trying to tell you.

B. Enable slow page logging.

C. Obtain and Analyze a heap dump.

D. Review memory utilization with VisualVM and the VisualGC plug-in.

E. Investigate method calls with HPJmeter

F. Capture a SQL trace during peak production site load.

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Listen to what your server is trying to tell youListen to what your server is trying to tell youListen to what your server is trying to tell youListen to what your server is trying to tell you

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Reading the CPU graphReading the CPU graphReading the CPU graphReading the CPU graph

A. Green line = Total CPU utilization

B. Red line = Kernel / System usage

C. Green – Red = Application CPU usage

D. High kernel usage is often indicative of an I/O issue.

E. Waiting on I/O means your application code is not executing.

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Enable slow page loggingEnable slow page loggingEnable slow page loggingEnable slow page logging

A. Enable slow page logging

B. Process the server.log file with findslow.cfm (at www.cfcode.net) to get a report on the most-often used slow templates.

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Obtain and analyze a heap dumpObtain and analyze a heap dumpObtain and analyze a heap dumpObtain and analyze a heap dump

A. Obtain a heap dump –XX:+HeapDumpOnOutOfMemoryError VisualVM (Applications -> Heap Dump)

B. Review the heap dump in Netbeans or VisualVM

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VisualVM heap dumpVisualVM heap dumpVisualVM heap dumpVisualVM heap dump

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VisualVM Heap Dump (continued)VisualVM Heap Dump (continued)VisualVM Heap Dump (continued)VisualVM Heap Dump (continued)

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VisualVM and VisualGCVisualVM and VisualGCVisualVM and VisualGCVisualVM and VisualGC

A. Increase in ‘heap size after full GC’ each time is indicative of a memory leak.

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VisualGC outputVisualGC outputVisualGC outputVisualGC output

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Review methods with HPJmeterReview methods with HPJmeterReview methods with HPJmeterReview methods with HPJmeter

A. Capture method invocation data -Xrunhprof:cpu=times,cutoff=0 View metrics -> Method Call Count View metrics -> Call Graph Tree (CPU)

B. Identify lingering objects (memory leaks) -Xrunhprof:heap=all,cutoff=0 View metrics -> Residual Objects (Count)

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Example of HPJmeter method count listExample of HPJmeter method count listExample of HPJmeter method count listExample of HPJmeter method count list

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HPJmeter Residual Objects (count)HPJmeter Residual Objects (count)HPJmeter Residual Objects (count)HPJmeter Residual Objects (count)

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Example of HPJmeter Call Graph TreeExample of HPJmeter Call Graph TreeExample of HPJmeter Call Graph TreeExample of HPJmeter Call Graph Tree

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Its not always about the codeIts not always about the codeIts not always about the codeIts not always about the code

A. Network latency

B. Overloaded disk resources

C. Poorly configured database

D. Web server configuration

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Identify Network IssuesIdentify Network IssuesIdentify Network IssuesIdentify Network Issues

A. Identify overloaded nic with task manager.

B. Identify host issues with ping or pathping.

C. Identify network connections with netstat –a, or using Free Extended Task Manager.

D. More detailed investigation can be done with managed routers, or tools like WireShark (formerly Ethereal) to capture and analyze all network traffic.

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Wireshark – packet listingWireshark – packet listingWireshark – packet listingWireshark – packet listing

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Wireshark – packet detailWireshark – packet detailWireshark – packet detailWireshark – packet detail

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Ports Open – Free Extended Task ManagerPorts Open – Free Extended Task ManagerPorts Open – Free Extended Task ManagerPorts Open – Free Extended Task Manager

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Identify Overloaded Disk ResourcesIdentify Overloaded Disk ResourcesIdentify Overloaded Disk ResourcesIdentify Overloaded Disk Resources

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Identify a poorly configured databaseIdentify a poorly configured databaseIdentify a poorly configured databaseIdentify a poorly configured database

A. Capture a .trc file using SQL profiler with the ‘tuning’ profile selected

B. Run your .trc file through the database tuning advisor (available on SQL Standard or higher) and quickly locate database slow-downs, and even implement recommended fixes.

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Configure your SQL captureConfigure your SQL captureConfigure your SQL captureConfigure your SQL capture

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SQL trace in progressSQL trace in progressSQL trace in progressSQL trace in progress

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Starting the tuning advisorStarting the tuning advisorStarting the tuning advisorStarting the tuning advisor

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Tuning advisor in progressTuning advisor in progressTuning advisor in progressTuning advisor in progress

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Database Tuning Advisor resultsDatabase Tuning Advisor resultsDatabase Tuning Advisor resultsDatabase Tuning Advisor results

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In the end, it’s really all about user perceptionIn the end, it’s really all about user perceptionIn the end, it’s really all about user perceptionIn the end, it’s really all about user perception

A. Enable gzip compression of static site assets.

B. Combine CSS and JS files for faster loading.

C. Enable expiration tags for images, CSS, and javascript files for a future date.

D. Use a tool like ySlow to identify user-side issues. http://developer.yahoo.com/yslow/

E. Testing with tools like Jmeter can help you get a better user perspective on site performance. http://jakarta.apache.org/jmeter/

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ReviewReviewReviewReview

A. Your Coldfusion server does not work in a vacuum.

B. Identify your dominant consumer first, and address each until acceptable performance is achieved.

C. Its not always about the code.

D. User perception is the final word in web site performance measurement.

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LinksLinksLinksLinks

A. VisualVM - https://visualvm.dev.java.net/download.html(visualGC available in the plugin center)

B. Netbeans - http://www.netbeans.org/downloads/index.html

C. HPJmeter – http://www.hp.com/java

D. Free Extended Task Manager - http://www.extensoft.com/

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Questions?Questions?Questions?Questions?

A. Chris Peterson, Server Engineer

B. Alagad, Inc.

C. http://www.alagad.com/

D. cpeterson@alagad.com

E. (888) Alagad4 ext 369

F. Override11 (twitter)