Performance/Status Meetings/2008-February-6

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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

  • Most remaining bad leaks are shutdown issues.
  • We're keeping closed windows alive too long after they are closed
    • Couple of issues fixed but one XBL issue still remaining. Ben Turner working on it.
  • Roc developed fixes for a couple of smaller leaks in widget code.
  • Peterv developed final(?) fix for yahoo toolbar. Might fix other extensions too.

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

  • Old tinderbox testing machines (non-talos) going away -- bug 413695.
    • Replacing machines with same pageset but running in Talos
  • JPEG/image speedups
    • remaining: bug 412396 JPEG decoding 10% slower on Mac trunk
  • 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)
    • Checked in: bug 411579 - Optimize read file buffer sizes for faster startup times
  • 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?)
  • Other
    • bug 353962 -- JS spinlocks vs. full locks (Crashes in Fx2)
  • On radar (unowned stuff that people have mentioned have mentioned we should look at at some point)
    • Partial compiles with icc
    • 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

  • bug 407459 -- Hook up jemalloc to our build
    • ported to windows, mac and linux. integrated to build system on mac and linux. windows work continuing. Hope to have numbers by end of the week.
  • bug 403830 -- Content arena
  • Other bugs (should have perf and footprint keywords)
    • bug 403354 -- Get rid of nsCStringArray ParseString usage [significantly better but doing some additional work on]
    • 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 410392 -- stack allocate gfx objects [patch, needs work]
    • bug 408921 -- Arenas size+header are too big for size classification [in progress]


Action Items

  • fix things
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