Launch Latency

Summary

Measures elapsed time from the first launch of an application to a series of defined startup events.

Usage

Test Cases

Launch each of the following apps from a cold state:

• Browser
• Calendar
• Camera
• Clock
• Contacts
• Dialer
• Email
• FM Radio
• Gallery
• Marketplace
• Music
• Settings
• SMS
• Template
• Usage
• Video

For each app, report the time elapsed to the following events:

• moz-chrome-dom-loaded
• moz-chrome-interactive
• moz-app-visually-complete
• moz-content-interative
• moz-app-loaded

Precision

TBD

How to Run On-Demand

TBD

Published Results

FxOS 2.0

FxOS 2.1

References

• Firefox OS App Responsiveness Guidelines

Development

Design

Common Setup

1. Set up workload
2. Restart B2G process

All Cases

1. Invoke launch programmatically
2. Inject the Performance Helper and save start time
3. App instrumentation throws timeline events at appropriate times
4. Performance helper observes events
5. Event emit times are compared with start time for time elapsed

Results

• Result is time elapsed to each event
• Execute test 30 times, for each event report mean, median, deviation

Project Roadmap

• Lead: Eli Perelman
• Tracking Bug: TBD

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