Performance/Status Meetings/2008-February-13

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Gecko 1.9 Performance and Leaks Meeting Details

  • Wednesdays - Firefox 3 - 10:00am Pacific, 1:00pm Eastern
  • Script Conference Room, Building S, Mountain View
  • 650-903-0800 or 650-215-1282 x91 Conf# 217 (US/INTL)
  • 1-800-707-2533 (pin 369) Conf# 217 (US)
  • irc.mozilla.org #perf for backchannel

Leaks

  • Ben Turner fixed a number of leaks causing documents to be kept alive too long.
  • Peterv has tentative patch for session restore leaking restored windows in some cases (such as error pages or pages not finishing loading).
  • 18 P1/P2s still open.

Action Items

  • AI:sicking Look into enabling trace-refcount, without the tracing part in nightlies.
  • AI:sicking Test leaked handles on windows manually using purify.
  • AI:sayrer Run leak buster while looking for trace-malloc leaks. [didn't get this done--sayrer]

Performance

  • Txul platform differences according to mac mini machines
    • mac: slowest on 1.8, slower still on 1.9 (30% regression) Looks even or better than branch
    • windows: fastest on 1.8, now in second place (30% regression) -- improving, still slower
    • linux: middle on 1.8, now fastest on 1.9 (30% improvement)
  • Ts improvements
    • Ts analysis: bug 406810
    • bug 311566 - nsCSSScanner::GatherIdent does lots of string appending
    • bug 412796 - Optimize fastload system (mmap fileIO, endianness, packed structs)
  • Profile Guided Optimization
    • bug 361343 - Win32 turn-on; bug 410994 - PGO Spidermonkey
    • TODO: Figure out Linux (sayrer)
    • TODO: Fix win32 breakage (cairo; possibly fixed with cairo patch?)
  • ICC partial compilation
  • Other
    • bug 353962 -- JS spinlocks vs. full locks (Crashes in Fx2) Fixed!
  • On radar (unowned stuff that people have mentioned have mentioned we should look at at some point)
    • Theme optimization
    • roc's scrollbar issues
    • startup performance (fastload perf, loading libXUL and other files, etc.) (unowned)
    • more work to speed up onSecurityChange, but further work will require SSL work and reducing the number of notifications
    • XPConnect accessor speed (bug 412531) (request for priority+owner by dietrich)

Action Items

  • make faster

Fragmentation

  • jemalloc
  • bug 403830 -- Content arena
  • Other bugs (should have perf and footprint keywords)
    • bug 407442 -- nsEventListenerManager allocates a lot [patch]
    • bug 408113 -- JS reallocate context->stackPool arenas way too often [patch]
    • bug 408301 -- XPConnect wrappers w/o XPConnect proto don't share JS scopes with their protos. [patch]
    • bug 410250 -- nsID/nsJSID stupid mallocs [patch]
    • bug 410357 -- use nsAutoTArray for nsCSSDeclaration::mOrder [patch]
    • bug 403354 -- Get rid of nsCStringArray ParseString usage [patch]
    • bug 408921 -- Arenas size+header are too big for size classification [patch]


Action Items

  • fix things
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