Snappy Apr. 5 Minutes

• Sample Q2 goals: https://wiki.mozilla.org/Performance/Snappy#Snappy_TODO
• Chart showing Snappy bugs resolved in the last week https://wiki.mozilla.org/Performance/Snappy/Dashboard#Resolved_in_the_last_week.
• did anyone attend the Intel sessions?
  • might be useful information at the next profiling session

Actions

No actions.

Incoming

• hardware acceleration: i disabled hwa on all macs in my family, and Firefox has been noticeably snappier across multiple types of macs. related bugs: bug 600763, bug 721273, bug 721892. should have someone from perf team or gfx dig in and at least confirm.
  • Taras asked to put on gfx q2 goals

Projects

Persona slowness(ehsan?)

Results from the past week

• issues discovered with animated personas and those that heavily use svg and css
• Ehsan to summarize the issue in a blog/wiki
• look at moving image decoding off of the main thread

Mainthread+Slow SQL (gavin/taras/vlad)

Results from the past week

• Worked on cancellable sql (bug 722243), have to figure out if benefit from cancellable queries justifies additional locking

Todo this week

• Ask SQLite guys about fine-grained cancels

Better DOM event/task scheduling - jst (telemetry)

Results from the past week

• starting to work on slowing down parser in background tabs

Super-slow-startup investigations - vlad, taras

Results from the past week

• Received batch of slow startup data from March

Startup optimizations - bbondy

Results from the past week

• bbondy: Bug 692255 - WIll have implemented super review comments for prefetch

Front-end - Dietrich/bbondy

Results from the past week

• Dashboard: https://wiki.mozilla.org/SnappyFrontEndDashboard
• QA chrome leak testing - should most affect frontend https://wiki.mozilla.org/QA/Snappy/Chrome_Leak_Testing
• IE Migrator changes started landing, Safari coming soon after.
• Tim Taubert put up AreWeSmallYet, tracking changes in build size: http://arewesmallyet.com/

Todo this week

• telemetry for home tab vs session restored
• telemetry for # of tabs restored
• taras: investigate if startup cache/omnijar is still of benefit

Profiler - jrmuizel/BenWa/Ehsan (and more)

Todo this week

• There seems to be an issue with symbolication with latest SPS extension version

Nondestructive chromehang - vlad

Results from the past week

• Co-ordinate with Softronics QA people & Moz privacy review
• bug 742008: Nightly profiling updates consistently failing

Todo this week

• Integrate about-telemetry into Firefox as a bundled addon
• Add a pass through mode so local symbolication server can pass symbolication requests to remote server (e.g. local Firefox symbols + remote Windows system symbols)

Peptest - mcote

Results from the past week

• revision numbers, with links, now in peptest graphs as of March 30
• results keep coming in!

GC pause reduction - billm

Results from the past week

• bug 641025: incremental GC - disabled due to leaks
• investigating leaks due to incremental GC
• landed bug 716142 (allow multi-compartmental GCs), which enables:
• worked on bug 739899, to keep compartment creation from stopping incremental GC
• Multi compartment GCs should also enable scheduling smaller chunks of GC and CC.

CC pause reduction - smaug, mccr8 (meta bug 698919)

Results from the past week

• smaug worked on trying to reduce the impact of leaked documents on the CC
• mccr8 worked on bug 653191 (collapse SCCs of JS in CC graph)
• remove more stuff from the CC graph (bug 740185)
• QA is working on plan to test for leaked documents

bug710935 - measure lag in handling user input (needs owner)

• bbondy: I'll probably be starting on this next week, but if you have someone else please feel more than free to take :)