Performance/Snappy/2013-01-24

Snappy Jan 24, 2013 Minutes

Actions

• vladan to send lmandel list of slow sql add-ons for follow-up with add-ons team
• benwa to send lmandel list on slow shutdown add-ons for follow-up with add-on team

Incoming

• Effects of JSM Compartments on Performance and Development Practices dev-platform post. Any action that this group needs to take?
  • https://groups.google.com/forum/?fromgroups=#!topic/mozilla.dev.platform/CoK0FMBVygs
• bug 834003 - Compare telemetry histograms on a Talos run on a PGO versus a non PGO build
• Latest chrome-hang dump + benchmark results: http://people.mozilla.com/~vdjeric/DecJanHangs.txt
• No more status for off weeks!
• bug 823147 - Avoid hitting D2D slow path when drawing radial gradients from css
• power efficiency measurements?

Projects

Startup & Shutdown

Results

• bug 822849, Don't run GC/CC timers on shutdown, landed
• bug 833143, Don't GC in nsXREDirProvider::DoShutdown(), landed...and backed out because of an webrtc bug
• Getting about 15 slow shutdown profiles a day

Todo

• bug 827976: Port patch to create hidden windows lazily to non-Mac platforms

Tab Strip (tab switch)

Todo

• no bug: Tab switch GC

Content (GC, CC, DOM storage, flash hang, DOM event/task scheduling)

Results

• bug 828034: Fix for Plugin Hang UI topcrasher should land today
• bug 834127 filed, Plugin Hang UI sometimes is created but not visible

Todo

• bug 833560 - Increase Plugin Hang UI threshold (to discuss)
• bug 832546: Filed bug for really bad jank from font loading on Wikipedia homepage

Temporary and Severe Browser Hangs (front-end, downloads, chromehang fixes, scrolling, prefs, slow sql)

Results

• bug 830765: Common multi-second hang during CollectNewLoadedModules. Ehsan is uplifting to Aurora & Beta
• bug 789975: nice graph of a perf win http://tinyurl.com/a9lda66
• No bug yet: preload flash the way we do with xul.dll, use readahead

Add-on and Web page introduced slowness (add-on manager start-up)

Results

• Fixed a couple of profiler crashes (bug 831459, bug 818958)
• revised telemetry probes patch waiting for feedback (bug 810146)

Todo

• get bug 810146 telemetry landed
• investigate jetpack add-on bootstrap time (file bug)
• convert add-on manager from sqlite to json

Page Load (cache, dns)

Results

• Cache caused 90% of slowness in Lifehacker Firefox 18 review

Tools (profiler, eideticker, peptest, talos)

Results

• Plugin profiling?
• bug 830429 - Reduce the threshold for slow main thread SQL to 50ms