LGTM to experiment from 132 to 134 inclusive (let me know if I got that
range wrong).
On 11/15/24 6:54 AM, 'Marja Hölttä' via blink-dev wrote:
After getting inconsistent results from our past experiments,
we'd like to run a two-arm origin trial combined with a Finch
holdback experiment. The two arms are for different
implementations of the feature (runtime features
JavaScriptCompileHintsMagic and
JavaScriptCompileHintsMagicAlways).
To do a two-arm Origin trial, I was told to use 2 origin trials for
the same Chromestatus feature. This is the "Intent to Experiment"
e-mail for the second one ( JavaScriptCompileHintsMagicAlways ).
Contact emails
[email protected], [email protected]
Explainer
https://github.com/explainers-by-googlers/explicit-javascript-compile-hints-file-based/blob/main/README.md
Specification
https://explainers-by-googlers.github.io/explicit-javascript-compile-hints-file-based
Summary
Allow attaching information about which functions should be eager
parsed & compiled in JavaScript files. The information will be encoded
as magic comments. We'll first target launching the file-based
explicit compile hints, and as a follow up, investigate selecting
individual functions for eager compilation.
Blink component
Blink>JavaScript
<https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3EJavaScript>
TAG review
TAG review status
Not applicable
Chromium Trial Name
JavaScriptCompileHintsMagic
Origin Trial documentation link
https://docs.google.com/document/d/19xTAM4A75tz0xUq_velMzGA4JHEgXpyflUxXTcuNiyE/edit?usp=sharing
Risks
Interoperability and Compatibility
No interoperability / compatibility risks. Other browsers are likely
to ignore the hints if they perceive they cannot benefit from them.
Ignoring the hint is allowed behavior. We plan to make the hints
generic though, so that other browsers can later start to support them
too, e.g., if they implement background parsing / compilation.
/Gecko/: N/A (https://github.com/mozilla/standards-positions/issues/780)
/WebKit/: N/A (https://github.com/WebKit/standards-positions/issues/172)
/Web developers/: Positive Positive signals from partners who want to
use compile hints to eager-compile core JS files.
/Other signals/:
WebView application risks
Does this intent deprecate or change behavior of existing APIs, such
that it has potentially high risk for Android WebView-based applications?
Goals for experimentation
Reason this experiment is being extended
The origin trial configuration for this feature was broken in
M115-M116, and the users weren't able to run the experiments. We did
an origin trial in versions 115-117. We modified the feature based on
the results (performance measurements by Google Workspace) and we'd
now like to do another origin trial with the modified feature, in
versions 129-131.
Reason this experiment is being extended
We got inconsistent results from the previous 2 experiments (which had
slightly different feature implementations). To investigate further,
we're planning to run an experiment where we compare those 2 feature
implementations against each other simultaneously, and also add a
Finch holdback experiment for already-shipping compile hints features
(crowdsourced compile hints and local compile hints) which might
interfere with the experiment. In addition, we landed code cache
related fixes in M132, and those should also be included in the rerun.
The rerun should target versions [132, 134].
Ongoing technical constraints
Debuggability
Will this feature be supported on all six Blink platforms
(Windows, Mac, Linux, ChromeOS, Android, and Android WebView)?
Yes
Is this feature fully tested by web-platform-tests
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>?
No
The feature doesn't trigger any functional changes and cannot be
tested by WPT.
Flag name on about://flags
Finch feature name
None
Non-finch justification
None
Requires code in //chrome?
False
Tracking bug
https://bugs.chromium.org/p/v8/issues/detail?id=13917
Estimated milestones
Origin trial desktop first 115
Origin trial desktop last 117
Origin trial desktop first 132
Origin trial desktop last 134
Origin trial extension 1 end milestone 131
Origin trial extension 2 end milestone 134
Origin trial Android first 132
Origin trial Android last 134
Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/5100466238652416?gate=6313707028873216
Links to previous Intent discussions
Intent to Experiment:
https://groups.google.com/a/chromium.org/g/blink-dev/c/BmN1Wus8V1s/m/3L2uU-wGAgAJ
Intent to Extend Experiment 1:
https://groups.google.com/u/1/a/chromium.org/g/blink-dev/c/mwZYYTBJ12g/m/HWsRCkuxAQAJ
Intent to Ship:
https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAED6dUAN%3DzwdBsziegkniJi2hhF%3DVQ7xUk%2BdvB-6V%2B-TCTdiPg%40mail.gmail.com
This intent message was generated by Chrome Platform Status
<https://chromestatus.com/>.
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