an ITCS-supported service my.umich.edu Project Information
Home: my.umich.edu Introduction About my.umich.edu What is my.umich.edu? Why is my.umich.edu needed? When will it be available? More frequently asked questions (FAQs) Communications Monthly brown bag meetings: information and schedule Brown bag presentations (view outlines and download .ppt files) News articles Policies & guidelines Previews 27 July 2000 30 August 2000 6 October 2000	my.umich.edu: Targeting Audiences Presented by Linda Place at my.umich Project Brown Bag Meeting, September 13, 2001   Download PowerPoint file Overview How the site works Reliability update Performance update Remaining service bugs Targeting audiences How the Site Works Running 24 ³instances² of application Each instance supports a few hundred sessions (user logins) Healthy instance = fast, reliable Unhealthy instance = slow, unreliable Reliability Update Symptoms Invalid response-type messages Unexpected logouts Fixes Apple deployment expert on site Identified bugs causing instance crashes Instance crash took down all sessions Went from 245/day to 15/day Performance Update Symptoms Slow slow slow Did I mention slow? Fixes Senior Apple developer on site for week Reductions in HTML code Smaller file size for download More Performance Fixes Database indexing Faster lookup and retrieval rates Fewer table lookup trips Caching shared data Reduce first page load time Introduced delay to announcement services Hidden Trouble Revealed What we knew Instances need memory space to behave properly When memory space becomes too small behavior turns nasty Recycle instances before memory space becomes too small Instance recycle time ~36 hours Hidden Trouble Bites Us Students begin hitting site Aug 26 Reliability problems keeping overall usage low Reduction in reliability problems lets more users into instances Increased usage cut instance recycle time to 10 hours or less Auto-scheduling not working Hidden Trouble Identified Insidious memory leaks Throughout code Not releasing memory used by each session Many leak fixes already rolled into code Many more still being trapped How Long To Full Memory? Uncertain All developers working on problem Apple working on problem with us Patches being rolled into pilot as soon as stable Doubled heap size Remaining Service Bugs Many fixes already in pilot Remaining bugs on hold until memory leaks patched Targeting Audiences ITCom targets residence halls, family housing Authorization code Monthly telephone statements Archive of statement history Personalized account-related announcements Law School Suite of audience-restricted services Introduced multiple pages at start ³Page 2² provides my.umich defaults Customization how-to page

September 25, 2001

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