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This presentation steps through how the University of Dayton identified why their Sakai server was underperforming. Hint: it was the hardware. Their findings are also presented.
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Is Sakai Always this Slow?
University of DaytonJune 16, 2010
University of Dayton
11th Sakai Conference - June 15-17, 2010
• Medium-Large Private School• Around 900 full/part-time faculty• 7400 undergraduate students• 3500 graduate students• About 500 faculty use Sakai
• Catholic Marianist Institution• Founded in 1850• Top ten US Catholic universities• Long basketball tradition
NIT Champions!
11th Sakai Conference - June 15-17, 2010
• 2010, our third NIT championship!
• 1903, our first team
Transitioning to Sakai
• On WebCT CE 4.1 for 5+ years• Product was end-of-lifed• It worked OK but Faculty found it difficult to use• Chose Sakai because
o Flexibility of open source solutiono Costs kept going up and up
• Branded Isidore
11th Sakai Conference - June 15-17, 2010
Our Objectives Today
1. Share a generic roadmap for performance troubleshooting2. Present our findings
11th Sakai Conference - June 15-17, 2010
Is Sakai really that slow?
11th Sakai Conference - June 15-17, 2010
The First Signs
• Reports of performance issues trickled in
11th Sakai Conference - June 15-17, 2010
• Initially dismissed/ignored claims o Pilot group hadn’t reported slownesso Not fair to compare Sakai to WebCTo Certain tools slow, but not the whole server right?
Our Application Environment
• Productiono Solariso Oracleo Files Stored in the DBo Tomcat and Apache
• Testing environment (exact copy of production)• Benchmark Site
11th Sakai Conference - June 15-17, 2010
The Speedy Environment
• Local developer’s installationso Linux (Ubuntu)o MySqlo Tomcato Walmart machine
• Matt finally saw the light!
OK, it really is that slow… But why?
11th Sakai Conference - June 15-17, 2010
What We Knew
• Independent of server load• JVM settings were good
11th Sakai Conference - June 15-17, 2010
Must be the application code…
11th Sakai Conference - June 15-17, 2010
Fixing One Thing at a Time
• Database queries• Excessive iterations
11th Sakai Conference - June 15-17, 2010
What’s the Community Say?
• Sakai Dev Groups• Conference in Boston
o Walked around with a laptopo No one else saw similar responses
11th Sakai Conference - June 15-17, 2010
The New Kid on the Block
Sakai vs. Things that are Trusted
YourKit - Java Profiler
Print Statements
Debugging the old fashioned way...
What We Knew
• Independent of server load• JVM settings were good• It's not the code• Well… it must be something in Isidore's
environment.
11th Sakai Conference - June 15-17, 2010
Check Everything Else…
11th Sakai Conference - June 15-17, 2010
jMeter Scripts
• jMeter - Open source Apache product• Not load testing• Tested 25 different environments
11th Sakai Conference - June 15-17, 2010
New Test Environments
• Kaylee: Sun Fire 280R• River: Sun Blade X6250 running Solaris• Simon: Sun Blade X6250 running Linux• Sakaitest:
o Copy of Isidore productiono Sun SPARC Enterprise T5220
11th Sakai Conference - June 15-17, 2010
• jMeter script load tools 100 times
It’s the Hardware!
11th Sakai Conference - June 15-17, 2010
Total Time to Completion
11th Sakai Conference - June 15-17, 2010
Requests > 1.5 Seconds
11th Sakai Conference - June 15-17, 2010
All Other Requests
11th Sakai Conference - June 15-17, 2010
Performance Relative to Sakaitest
11th Sakai Conference - June 15-17, 2010
Detailed Test Environments
• Kaylee: Sun Fire 280Ro An older SPARC server running Solaris 10o 2 - UltraSPARC III+ processors, 4 GB memory
• River: Sun Blade X6250o A newer x86 64-bit server running Solaris 10o 2 - Quad Core Intel Xeon processors, 16 GB memory
• Simon: Sun Blade X6250o A newer x86 64-bit server running Linuxo 2 - Quad Core Intel Xeon processors, 16 GB memory
• Sakaitest: Sun SPARC Enterprise T5220o Sun T2 series server running Solaris 10o 1 - Quad Core UltraSPARC T2 processor, 16 GB memory
11th Sakai Conference - June 15-17, 2010
Future Work
• Possibly switch hardware on database servers
• Continue monitor speed• Improve single tools
11th Sakai Conference - June 15-17, 2010
Questions?
11th Sakai Conference - June 15-17, 2010
http://www.surveymonkey.com/s/sakai10
11th Sakai Conference - June 15-17, 2010
Evaluation
Image BibliographyUD Logo - http://logo.udayton.edu/zoom.asp?whichpic=redbluep1Marianist Cross - http://portal.chaminade-stl.com/Portals/104/images/marianist%20cross.bmpFirst Basketball Team - http://digital.udayton.edu/u?/archives,6222010 NIT Champions - http://www.waitingfornextyear.com/wp-content/uploads/2010/04/Dayton-NIT-Champs.jpgIndian Star Tortoise - http://i481.photobucket.com/albums/rr176/848leanne/george%20feb%2009/georgefeb09004.jpgPenguin Team - http://www.kernel.org/pub/linux/kernel/people/paulmck/Confessions/Elephant_Team_03.jpgThe Matrix - http://images.psxextreme.com/wallpapers/ps3/the_matrix_has_you_770.jpgSpinning Wheel - http://upload.wikimedia.org/wikipedia/commons/e/e0/Irish_spinning_wheel.jpgStrike out - http://bmiller.mlblogs.com/strikeout.gifSerenity - http://www.superherostuff.com/blog/wp-content/uploads/2010/04/serenity-cast.jpgFireworks - http://www.visitdarkecounty.org/discover/enewsletter/MPj04100830000%5B1%5D.jpg Pointing - http://www.anzemc.com/p7bpassets/images/ANZEMC_FingerPoint_1.jpg
11th Sakai Conference - June 15-17, 2010
