Greetings Everyone, A lot has been accomplished since our last newsletter so we are back with more Fission news in our Newsletter #9.
Experimenting with Fission in Nightly With the completion of Fission milestone M6b, Fission Nightly experiment was launched for 5% of Nightly on October 13. We observed surprisingly good results in the first three weeks and decided to increase the experiment percentage to 10% of Nightly on November 3. We continue to monitor the results and the experiment data <https://protosaur.dev/fission-experiment-monitoring-dashboard/dashboard/dashboard.html> is looking very good. One of the notable impressive ones is lower checkerboarding severity with Fission enabled (read here <https://searchfox.org/mozilla-central/source/gfx/docs/AsyncPanZoom.rst#93-110> if you’re interested in finding out what does checkerboarding represent). Other performance and memory probes are also showing Fission results within the noise level when compared to the non-Fission measurements, which is great!. Below are some examples of this. Arriving at the Finish Line We are very glad to report the completion of Frontend migration of all framescripts to JSActors. Also, equally happy to report that printing of out-of-process iframes is now working and complete. If you still see any issues, please report them for the `Core::Printing:Output` component blocking the meta printing-fission <https://bugzilla.mozilla.org/show_bug.cgi?id=1480547> bug. Fission Performance Visual metrics performance dashboards have been added for Fission at https://arewefastyet.com <https://arewefastyet.com/linux64/cold-page-load/overview?numDays=7> for Linux64. Some of the sites are showing performance regressions for Fission and we are looking into debugging and adding optimizations to improve those. Session Storage Moved to the Parent Process One of the major themes with Fission has been the move from content processes to parent process. Continuing with that theme, Session Storage has also been moved to the parent process in Bug 1654080 <https://bugzilla.mozilla.org/show_bug.cgi?id=1654080>. See your processes Fission added a new about:processes page to show users more information about the different processes Firefox uses and the corresponding origins loaded in them. It groups the same sites from different tabs and frames together for better readability and shows corresponding CPU and memory usage. Double-clicking on any row representing a tab in about:processes will take you to that tab. Also, the last column in about:processes allows the user to kill a tab or a process by clicking on the ‘x’. Bug 1674084 <https://bugzilla.mozilla.org/show_bug.cgi?id=1674084> enabled about:processes to ride the trains starting with Firefox 84. Help Firefox get Fission-ready You can help us test Fission on Firefox Nightly by enabling Fission in about:preferences#experimental followed by restarting Firefox for it to take effect. For any follow-ups or comments or questions, you can find us at #fission in Slack and Matrix/Element. -The Fission Team. _______________________________________________ dev-platform mailing list firstname.lastname@example.org https://lists.mozilla.org/listinfo/dev-platform