LGTM3
On 6/25/26 4:17 p.m., Chris Harrelson wrote:
LGTM2
On Wed, Jun 24, 2026 at 10:28 AM Alex Russell
<[email protected]> wrote:
LGTM1
On Wednesday, June 24, 2026 at 1:37:02 AM UTC-7 Chromestatus wrote:
*Contact emails*
[email protected]
*Explainer*
/No information provided/
*Specification*
https://github.com/gpuweb/gpuweb/pull/5578
*Summary*
Adds the optional GPU feature "subgroup-size-control" that
allows explicitly setting the subgroup size in a compute
shader. This technique is particularly useful for the
applications that need to optimize the performance of the
compute shader using subgroup operations with specifc subgroup
size on certain platforms, such as the AI workloads.
*Blink component*
Blink>WebGPU
<https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3EWebGPU%22>
*Web Feature ID*
Missing feature
*Motivation*
Adds the optional GPU feature "subgroup-size-control" that
allows explicitly setting the subgroup size in a compute
shader. This technique is particularly useful for the
applications that need to optimize the performance of the
compute shader using subgroup operations with specifc subgroup
size on certain platforms, such as the AI workloads.
*Initial public proposal*
/No information provided/
*TAG review*
/No information provided/
*TAG review status*
Pending
*Goals for experimentation*
None
*Risks*
*Interoperability and Compatibility*
This feature has been approved in W3C GPU for the Web WG
meetings including participants from Safari and Firefox:
https://github.com/gpuweb/gpuweb/wiki/GPU-Web-2026%E2%80%9006%E2%80%9023-WGSL#add-extension-subgroup-size-control-5578
/Gecko/:
Positive (https://github.com/gpuweb/gpuweb/pull/5578) "Feedback
indicated via WebGPU standardization process."
/WebKit/:
Positive (https://github.com/gpuweb/gpuweb/pull/5578) "Specification
approval constitutes a positive signal, per
https://github.com/WebKit/standards-positions/issues/294#issuecomment-1877411933";
<https://github.com/WebKit/standards-positions/issues/294#issuecomment-1877411933%22>
/Web developers/: No signals
/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?
/No information provided/
*Debuggability*
/No information provided/
*Will this feature be supported on all six Blink platforms
(Windows, Mac, Linux, ChromeOS, Android, and Android WebView)?*
No
Will immediately be available on Android, Android WebView,
ChromeOS, Linux and Windows, where hardware support is available.
*Is this feature fully tested by web-platform-tests
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>?*
Yes
WebGPU/WGSL have a conformance test suite
(https://github.com/gpuweb/cts) that is regularly pulled into
Chromium and part of the testing of Dawn/Tint in Chromium.
While the CTS can be embedded in WPT, the WebGPU team opted to
keep it separate in Chromium testing to use a customized
harness for robustness and performance:
https://github.com/gpuweb/cts/issues/4640
*Flag name on about://flags*
/No information provided/
*Finch feature name*
/No information provided/
*Non-finch justification*
/No information provided/
*Rollout plan*
Will ship enabled for all users
*Requires code in //chrome?*
False
*Tracking bug*
https://issues.chromium.org/issues/463721943
*Estimated milestones*
No milestones specified
*Anticipated spec changes*
Open questions about a feature may be a source of future web
compat or interop issues. Please list open issues (e.g. links
to known github issues in the project for the feature
specification) whose resolution may introduce web
compat/interop risk (e.g., changing to naming or structure of
the API in a non-backward-compatible way).
/No information provided/
*Link to entry on the Chrome Platform Status*
https://chromestatus.com/feature/5077657663438848?gate=6732991276646400
This intent message was generated by Chrome Platform Status
<https://chromestatus.com>.
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