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A talk that Carsten and I did at OSCON 2008 about fixing memory leaks in Firefox 3

A talk that Carsten and I did at OSCON 2008 about fixing memory leaks in Firefox 3

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Oscon2008 Qa Leak Testing Latest Slides Oscon2008 Qa Leak Testing Latest Slides Presentation Transcript

      • OSCON 2008 - Fixing Hard Problems Through Iterative QA and Development
    Clint Talbert - Carsten Book Mozilla Corporation 24.July 2008
  • Introduction
    • Process Overview
    • Leak Testing Overview
    • Tools
    • Memory Leak Debug Test Builds
    • Leak Gauge
    • Manual Tests (Litmus)
    • Add-on Testing
    • Milestones so far
  • The Approach
    • Development and Test Development collaborate on tests and tools
    • Create widely applicable, reproducible tests
    • Test Tools are treated as first rate products
    • Implement a reporting structure for results
  • Collaboration
    • Developers and Test developers bring different perspectives to the table
    • Developers concentrate on the deep tools to measure behavior of code (i.e. Ref-Counting Analysis etc)
    • Test Developers work on harnesses and reporting infrastructure, lowering barrier of entry
    • Having reliable test tools that are run and developed on a regular basis help bring a sense of testing into the development culture.
  • Reproducible
    • Use VM's where you can
    • Keep tests and tools simple
    • By taking reliable test tools into “impure” systems, you can get results that you can trust.
  • Test Tools Are Products
    • Test Tools must grow with the product
    • Test Tools must be simple and maintainable
    • Test Tools must be developed and QA'd just like the product they are testing
    • Test Tools should be very easy to run
    • Test Tools should require only the most basic level of infrastructure possible to run. (But should also fit into a high infrastructure scenario for reporting)
  • Reporting Results
    • Use results to further a culture of testing
    • Use results to understand if the test is reliable, and if so broaden your testing scenarios
    • Easy to understand results empower community members
  • Reporting Results
    • What our results reporting looks like
  • Leak Testing Overview
    • Lots of Memory Improvements for Firefox 3:
    • The XPCOM cycle collector continuously cleans up unused memory. Plus, hundreds of memory leaks are now remedied
    • Memory Leak Tests after every Code change to make sure we introduce no new Memory Leaks
    • QA also started with a lot of Tests for Memory Leaks
    • Mozilla QA runs manual tests using the Litmus Testcase Suite (using Tools such as Debug Builds and Leak Gauge)‏
    • Regression Memory Leak Testing of Firefox
    • Memory Leak Tests of new and popular Addon's
    • Future: More Automated Tests run by Mozilla QA
  • Tools
    • Various Tools for Performance and Leak Testing ‏
    • QA uses Debug Builds and Leak Gauge
    • Debug Builds: Debug Builds can be build with Trace-Malloc Support to search for Memory Leak Builds – every time up to date build with latest checkins and overview over Leaking Components (but Debug Builds need to be built individually and you need a Development Environment (Xcode, Visual Studio Express, etc) for most platforms)‏
    • Leak Gauge: Developed by David Baron - It is designed to assist in detecting what leaks of large object graphs occur during normal browsing activity. The logging can be run during normal browsing without significant overhead . Log taken by setting environment variables in a release build.
  • Debug Builds
    • Using Firefox Debug Builds with Trace Malloc enabled for all Plattforms (Windows XP/Vista, Linux and Mac 10.4/10.5)‏
    • Trace Malloc allows searching for Memory Leaks
    • Can provide a Log File Output
    • Identify Leaking Components, this information helps Developers to debug and fix the Memory Leak !
  • Leak Gauge
    • Easy to use Memory Leak Test Tool developed by David Baron
    • Only Requirement is a environment variable and works on all platforms “c:NSPR_LOG_MODULES=DOMLeak:5,DocumentLeak:5,nsDocShellLeak:5,NodeInfoManagerLeak:5”
    • And “set NSPR_L OG_FILE= c:leak1.log “ to d efine a Leak Log
    • Works on Firefox 2 and Firefox 3+ Release Builds
    • Leak Log Upload Form on http://mxr.mozilla.org/mozilla/source/tools/footprint/leak-gauge.html for analysis
    • Upload Form indicates if a Memory Leak was found
  • Leak Gauge Log Output
    • W hen a Memory Leak was found the output of the Log analysis look like this :
    Memory Leak
  • Litmus based Tests
    • To make sure we have no hidden Memory Leaks in Firefox Mozilla QA was running a FFT (Full Functional Tests) Testrun in Litmus ( http://litmus.mozilla.org ) with Debug Builds on Linux, Mac and Windows. Memory Leaks were Reported to the Bugzilla DB.
    • Litmus is a Open Source Test Case Management Tool. Litmus contains manual testcases and a Full Functional Test contains around 750 manual testcases from all Firefox areas.
  • Add-ons Testing
    • Addon Memory Leak Testing is a big focus of the QA Memory Leak Testing Work
    • We test new Extensions uploaded to Addons.mozilla.org and also the Top-Downloaded and Recommend Addon's
    • Leak Testing is done with Debug Builds and also with Leak Gauge
    • We provide also a Leak Gauge “How-To” for Addon Developers and AMO-Editors
    • In the Future – A successful Leak Test is a requirement for new Addons on Addons.mozilla.org
    • A best practices Document is in progress to give Addon Developers a hand in avoiding Memory Leak
  • Addon Testing Practice
    • We use new Profiles to avoid any false-positive Results from other Extensions
    • We test all aspects of the Extension (Install, Uninstall, Features of the Extension)
    • Provide Detailed Steps to reproduce so that this Memory Leak is reproducible by Developers and also to be able to verify the fix of this Leak.
    • In case a Memory Leak was found we file a Bug in the Mozilla Bug Database and inform the Extension Developer
    • Future Plan: We will use more Automation to do this testing !
  • Success so far
    • Successfully identified various types of Leaks in Extensions and Firefox Components – also in specific Scenarios – beyond automated Tests
    • Memory Leak Logs from Debug Builds and Leak Gauge Help Developers to identify the cause of the Leak
    • Memory Leak Testing of Extensions help to maintain the great Firefox 3 Performance
  • Questions ?
    • References:
    • http://wiki.mozilla.org/Performance:Leak_Tools Overview over Performance/Leak Tools
    • http://blog.pavlov.net/2008/03/11/firefox-3-memory-usage/ Blog Post from Stuart Parmenter
    • http://blog.mozilla.com/tomcat/2008/03/21/extension-memory-leak-testing/ Blog Post about the QA Extension Testing
    • Contact:
    • Clint Talbert (ctalbert on irc.mozilla.org) [email_address]
    • Carsten Book (tomcat on irc.mozilla.org) [email_address]