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Enable sampling profiler for better `bootup-time` attribution

See original GitHub issue

Feature request summary Enable the disabled-by-default-v8.cpu_profiler trace category.

What is the motivation or use case for changing this? In https://github.com/GoogleChrome/lighthouse/pull/7059#issuecomment-461924036 we discussed enabling the sampling profiler to improve the attribution of scripts in bootup-time audit. Additionally, one of our smoketests that tests attribution was thought to only require async stacks, but turns out also needs sampling profiler now due to other restructuring of tasks.

https://github.com/GoogleChrome/lighthouse/blob/b4d9107263db043e6f776892571e4b9575c78a42/lighthouse-cli/test/smokehouse/tricky-metrics/expectations.js#L63-L71

How is this beneficial to Lighthouse? Improved attribution of scripts and the elimination of “Other” as a large category in bootup-time results.

Issue Analytics

State:
Created 4 years ago
Reactions:12
Comments:18 (1 by maintainers)

Top GitHub Comments

6reactions

patrickhulcecommented, Jun 15, 2020

We decided to proceed here and add this data to bootup time in an additive way.

5reactions

patrickhulcecommented, Sep 13, 2019

How can we verify the impact of this? DZL??

Yep, the last time I tried this out in DZL there was no observable impact, but that didn’t seem to convince anyone at the time.

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