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 emailsma...@google.com, lesz...@google.com 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 componentBlink>JavaScript <https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3EJavaScript> TAG review TAG review statusNot applicable Chromium Trial NameJavaScriptCompileHintsMagic 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 nameNone Non-finch justificationNone Requires code in //chrome?False Tracking bughttps://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 discussionsIntent 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/>. -- Google Germany GmbH Erika-Mann-Straße 33 80636 München Geschäftsführer: Paul Manicle, Liana Sebastian. 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