LGTM2
On Thu, Jan 16, 2025 at 5:28 PM Chris Harrelson
<chris...@chromium.org> wrote:
Great! LGTM1
On Thu, Jan 16, 2025 at 8:02 AM 'Alan Baker' via blink-dev
<blink-dev@chromium.org> wrote:
We've just merged the spec after it got its final approval.
On Wednesday, January 15, 2025 at 11:13:34 AM UTC-5 Chris
Harrelson wrote:
Great thanks, sounds like a very useful OT.
Now we're just waiting for the spec PR to land, since it
seems to be approved.
On Wed, Jan 8, 2025 at 7:13 PM 'Alan Baker' via blink-dev
<blin...@chromium.org> wrote:
The origin trial resulted in the following findings:
1. This functionality can achieve the performance
improvements we expected. Meet integrated the
functionality into some of its ML shaders.
Benchmarking subgroups vs integer dot products
(previous best) for matrix-vector multiply
shaders resulted in speed ups of 2.3 - 2.9x
depending on the device.
2. Limits were not the right design choice for
subgroup size reporting in the API. They have
since been moved into GPUAdapterInfo as they are
really more static properties of a device.
3. The initial design contained an extra diagnostic
that defaulted to an error to increase
portability, but was found to hamper the user
experience more than the value it added. It
prevented very common code patterns unrelated to
the subgroup functionality from
compiling cleanly. It was decided to remove it
from the design.
On Wed, Jan 8, 2025 at 4:16 PM Chris Harrelson
<chri...@chromium.org> wrote:
Ok thanks for clarifying that this is shipping
and not further experimentation.
Could you share the findings from the origin trials?
On Wed, Jan 8, 2025 at 11:31 AM 'Alan Baker' via
blink-dev <blin...@chromium.org> wrote:
I've filed the standard's position issues
(and added to the feature). Here they are for
reference:
* Mozilla:
https://github.com/mozilla/standards-positions/issues/1160
* WebKit:
https://github.com/WebKit/standards-positions/issues/446
The name was a bad choice. I wasn't familiar
with this process initially and only thought
of the name with the Origin trial in mind. We
don't consider this an experiment anymore.
On Wed, Jan 8, 2025 at 11:31 AM Chris
Harrelson <chri...@chromium.org> wrote:
Also:
* The spec PR needs to land
* What do you mean by "experimentation"
in the title of this Intent?
On Wed, Jan 8, 2025 at 8:30 AM Alex
Russell <sligh...@chromium.org> wrote:
Hey Alan,
Just for the avoidance of future
friction, we try to use the explicit
signals systems from Apple and
Mozilla because they've asked us not
to use their rep's statements in WGs
as assent. Is it possible for you to
file those?
Best,
Alex
On Monday, January 6, 2025 at
10:48:36 AM UTC-8 Alan Baker wrote:
Contact emails
alan...@google.com
Explainer
https://github.com/gpuweb/gpuweb/blob/main/proposals/subgroups.md
Specification
https://github.com/gpuweb/gpuweb/pull/4963
Approved by Apple rep, editorial
comment by Mozilla rep.
Summary
Adds subgroup functionality to
WebGPU. Subgroup operations
perform SIMT operations to
provide efficient communication
and data sharing among groups of
invocations. These operations can
be used to accelerate
applications by reducing memory
overheads incurred by
inter-invocation communication.
Blink component
Blink>WebGPU
<https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3EWebGPU%22>
TAG review
None
TAG review status
Not applicable
Origin Trial Name
WebGPU Subgroups Features
Chromium Trial Name
WebGPUSubgroupsFeatures
Origin Trial
documentation link
https://github.com/gpuweb/gpuweb/blob/main/proposals/subgroups.md
WebFeature UseCounter name
kWebGPUSubgroupsFeatures
Risks
Interoperability and
Compatibility
None
/Gecko/: No signal
/WebKit/: No signal
/Web developers/: No signals
/Other signals/:
Security
None. This feature exposes
functionality for operations only
within a single draw/dispatch.
Data is contained within a single
users run.
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?
None
Debuggability
No special debugging is available
for this feature as it resides
solely on the GPU.
Will this feature be
supported on all six
Blink platforms (Windows,
Mac, Linux, ChromeOS,
Android, and Android
WebView)?
No
Is this feature fully
tested by
web-platform-tests
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>?
No
Flag name on about://flags
None
Finch feature name
None
Non-finch justification
None
Requires code in //chrome?
False
Availability expectation
Both Apple and Mozilla have
indicated they plan to support
this feature in the future. Those
implementations are catching up
to Chrome in terms of core
functionality currently. WebGPU
is part of Safari technical
previews and Mozilla nightly builds.
Adoption expectation
This feature should have wide
adoption for specific use cases.
It is not expected that all
WebGPU shaders would utilize
subgroups, but many applications
(e.g. ML) could.
Non-OSS dependencies
Does the feature depend on any
code or APIs outside the Chromium
open source repository and its
open-source dependencies to function?
No
Estimated milestones
Shipping on desktop 134
Origin trial desktop first 128
Origin trial desktop last 131
Origin trial extension 1 end
milestone 133
Shipping on Android 134
Origin trial Android first 128
Origin trial Android last 131
Shipping on WebView 134
Origin trial WebView first 128
Origin trial WebView last 131
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).
Editorial changes only. Future
features are likely to build on
top of this extension.
Link to entry on the
Chrome Platform Status
https://chromestatus.com/feature/5126409856221184?gate=5073549680443392
Links to previous Intent
discussions
Intent to Experiment:
https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CABg%2BrB67gB5gUeDVPaMZ7fZwmeARTUsizs1BTXFXKGpJ%3DpF1TQ%40mail.gmail.com
Intent to Extend Experiment 1:
https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CABg%2BrB5jfO13yZGBxMAHRgZX_P0qbixCKSK10SujYkBxftujnQ%40mail.gmail.com
This intent message was generated
by Chrome Platform Status
<https://chromestatus.com/>.
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