Performance/Status Meetings/2007-July-11

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Gecko: Perf discussion

• Perfathon update
  • vlad failing to provide data
  • vlad will do so by next wednesday, because even if I had started uploading useful data the upload probably wouldn't have finished by then (sorry!)

• pageload test rewrite (bug 387110)
  • since we have a chance at a clean break, we should look at how the composite scores are calculated
  • do we still want to ignore the biggest value when computing the mean and stddev? (there is caching and stuff that happens during the first time a page is loaded that ends up beneficially effecting subsequent page loads)
  • do we want to more cycle more intelligently?
    • e.g. do we want to keep cycling (up to some max) until the stddev drops below some number?
    • do we want to try to intelligently throw outliers out?

• update on timer resolution on windows from Rob Arnold.
• Talos results
  • What's it look like for 1.8 -> 1.9?

• Todo: verification of test results
  • Fonts, valid rendering, etc.
  • TODO: Stuart: verify that concerns about talos results are addressed

• probe update
  • vlad spoke with Sun guys
  • will work with them to integrate XP-probes and dtrace probes into (most likely) a new toplevel module
  • then will present to module owners and show demos
    • hopefully can convert per-module tracing schemes into probes
    • Sun guys would be happy to come out and do a presentation of dtrace-in-mozilla and give an idea of what can be done with dtrace itself and the scripts
  • dtrace should probably be on by default in our builds if dtrace is possible
    • not sure about OSX -- can we build with dtrace enabled and still run on 10.4?
  • xp probes should be off, but possibly on in our tinderbox/nightly builds
    • vlad to investigate perf impact

Previous weeks

• jrpof tinderbox

• synthetic tests (TODO)
  • put specific tests into talos framework
  • poach mochitest performance tests
  • individual reftest-like items

• need to get a bunch of people looking at profiles (TODO)
  • take up some of these meetings to sit down and look at profiles
  • timer-based profiling is better (vtune/jprof/oprofile/etc., not quantify)
  • TODO: vlad to generate profile for next week's meeting

• running without Fx chrome
  • new pageloader stuff can do this

• examining default theme for performance issues

• Tp vs. Tp2
  • new pageloader stuff avoids this problem
  • Tp2 was flawed in some ways -- one big one is that it loaded pages in an iframe, so initial paint delay was never coming into play, and we were potentially reflowing more thannecessary

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