1315331 - Gather telemetry for SDK add-on startup and loader performance

Status: RESOLVED WONTFIX

(Add-on SDK Graveyard :: General, defect)

Description

[Kris Maglione [:kmag]]

After landing patches for bug 1308332, we had a hard time finding existing telemetry probes to give us useful data on the impact, and wound up falling back to ad-hoc analysis of thread hang data. In order to better track regressions in this area, especially in e10s, we should add probes for:

- Time spent in the 'sdk/addon/runner' run() function for each add-on, and/or the 'toolkit/loader' main() function. These functions do the bulk of loading and initialization for add-on code at startup.

- Total time spent in the loader's require() method, and time spent actually loading code (as opposed to overhead).

- Time spent in the loader's load() method, which does the actual loading work, and isn't always called by require().

Ideally, we should also try to get separate measurements for times shortly after startup (for both content and parent process) vs. later in the process lifecycle so we can gauge the specific impact on startup performance.

Comment 1

[:shell escalante]

added ben, dave, and me to this card.  Kris, can you need info me when it's done so we can look at if we want to expand current beta metrics we are collecting?  Could be something that is looked at over time - also interesting with all the e10s, sandboxing, and multi changes if perf is impacted.

Comment 2

[Andy McKay]

At this point given the lifespan of the SDK I don't think we should be worrying about this.