TPEPerformance

This page is for tracking tasks of the performance team at Mozilla Taipei Office.

Working On

• Memory
  • Nuwa
    • Bug 890870 - Use a deterministic point to freeze of the Nuwa process
    • Bug 928995 - Let PreallocatedProcessManager manage Nuwa process.
    • Bug 922465 - Automated tests for the Nuwa process.
    • Bug 930282 - Enable the Nuwa process on B2G by defaut.
    • Bug 938470 - Investigate delaying homescreen launch from the Nuwa process.
  • swap out anonymous memory with static content of the b2g process
    • https://wiki.mozilla.org/AnonymousPageCache
    • https://bugzilla.mozilla.org/show_bug.cgi?id=899493
    • https://bugzilla.mozilla.org/show_bug.cgi?id=919901
  • script-sources
    • In b2g and homescreen it consumes 4MB ~ 5MB totally.
    • In facebook and twitter it consumes ~1.3MB for each.
    • Need to investigate the benefits of disabling it under zRam.
  • Misc
    • Bug 941792 - Make sure decommitting actually works on B2G
    • Bug 944224 - Considerable amounts of images as dataURLs
• IPC
  • Linux/or POSIX aio instead of IO thread
    • https://bugzilla.mozilla.org/show_bug.cgi?id=915733
  • shmem for big data chunks
• Media
  • Unified buffering
• Launch time of Apps
  • Preload JS code with Nuwa
  • Precompile JS code with the baseline compiler
  • Profiling
• Animations
  • use caches for display lists to reduce overhead of nsIFrame::BuildDisplayList()
    • https://groups.google.com/d/msg/mozilla.dev.tech.layout/BL3BNQu4sSA/CMHWMEHp9x0J
    • https://bugzilla.mozilla.org/show_bug.cgi?id=908626
• Task Tracer
  • https://bugzilla.mozilla.org/show_bug.cgi?id=908995
  • https://groups.google.com/d/msg/mozilla.dev.b2g/dr3RrYUvP-w/Q51za7NvIWwJ
  • Keep the tracks of tasks
  • Record how tasks are post among threads & processes
  • Remember when tasks are post, dispatched, completed
  • Remember relation-ships among tasks
  • Task IDs are <otid,sn> pairs (tid is the thread id)
    • otid is the thread id of origin site
  • The track of a task is a list of <tid>:<otid>:<rtid>:dtime:stime:ftime
    • tid is the unique id of the runnable/task. Every task has an unique id.
    • rtid is the thread id of running thread
    • dtime is the dispatched time
    • stime is the start time
    • ctime is the finished time
  • Task type - names of handlers
  • TODOs
    • data retrieving tool and protocol
      • https://bugzilla.mozilla.org/show_bug.cgi?id=916409
    • Integrate it with Cleopatra
      • https://bugzilla.mozilla.org/show_bug.cgi?id=916410
    • Mark event sources
• App session resuming
  • like hibernate
  • load an App from storage and restore to the states of last killed.
• XHR Batch Queue API
  • https://wiki.mozilla.org/WebAPI/XHRBatch
  • Submit a XHR to a queue on the device, the platform will handle the XHR until it is completed
  • Notify the App while all XHR on the queue is completed
  • The app can check its own queue
  • The app can be killed, or being stopped by the user, while XHR is still running.
  • The platform will wake up the app while the queue is completed an the app is not running.
• Stability Issues
  • Bug 926734 - [Flatfish][Profiling]: When starting up Gecko profiling tool, system got hang.
  • Bug 922548 - [Flatfish][Profiling]: Fails to analysis the parsed file for Gecko Profiling tool.

Ideas

• Track JSObjects that fallback to dictionary mode
  • Time spent(impaction) on objects of dictionary mode
  • For games
• command queue for SVG frames
• Compare loading time for loading from scratch and from dumped image.
• Establish a benchmark to measure memory usage. Refer to AWSY.
• Check how to share data among iframes/tabs from same sources.
  • Ion/baseline codes, bytecode, script-source, type, shape, etc.

Finished

• Memory
  • Reduce CSP cache memory usage.
    • bug 897741 Don't put gigantic data URIs in the CSP cache. (8/20)