996119 - Breakdown - investigations of performance/memory usage of language detection

Status: VERIFIED FIXED

(Tracking Graveyard :: Firefox Operations, defect)

Description

[Florian Quèze [:florian]]

There are several things that we need to investigate to convince ourselves that the performance and memory usage of our language detection code is reasonable. I think we should break this down in smaller parts.

Comment 1

[Mike Hoye [:mhoye]]

Following the triage meetings, this remains unassigned. Florian, would you be willing to mentor a community member through this bug? Since it's vaguely specified, you'd likely need to spend a bit of time explaining what to measure and where to find it.

Comment 2

[Mike Hoye [:mhoye]]

Nope, my mistake - No diamond status for story-breakdown bugs, sorry.

Comment 3

[Florian Quèze [:florian]]

We want to ensure that the performance (both startup and page load), memory usage and code size of what we ship is reasonable. I think there are 2 possible approaches here: 1. check how what we currently have performs and decide if it's acceptable; 2. compare what we have against a binary version (which we currently don't have).

I think it makes sense to follow the first approach, and spend time building a working binary version only if we aren't satisfied with what we find for the asm.js version.

I've filed the following bugs to investigate the various points we care about:

Startup performance:
Bug 1003117 - verify if the omni.ja size increase due to cld.js and cld.js.mem causes startup performance issues

Page load performance:
Bug 1003118 - check the impact of running language detection on page load times

Memory usage:
Bug 1003120 - measure resident memory use of CLD after startup
Bug 1003124 - verify that CLD's memory usage doesn't grow infinitely
If we aren't satisfied with the data we find in these 2 bugs, we will want to file a bug to "compare asm.js-CLD memory usage with the native CLD". I think it would be premature to file this bug now.

Code size:
Bug 1003125 - compare the size of the emscripten'ed CLD with the native binary