<html>
<head>
<base href="https://bugs.freedesktop.org/">
</head>
<body>
<p>
<div>
<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED NOTABUG - Invalid subgroupSize for Intel GPU"
href="https://bugs.freedesktop.org/show_bug.cgi?id=108875#c8">Comment # 8</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED NOTABUG - Invalid subgroupSize for Intel GPU"
href="https://bugs.freedesktop.org/show_bug.cgi?id=108875">bug 108875</a>
from <span class="vcard"><a class="email" href="mailto:jason@jlekstrand.net" title="Jason Ekstrand <jason@jlekstrand.net>"> <span class="fn">Jason Ekstrand</span></a>
</span></b>
<pre><span class="quote">> The subgroupSize is 32 only for shaders with local group size more than 896.</span >
Correct. We have to run 32-wide when you get very large local group sizes in
order to fit the entire group on the GPU at once. Otherwise, we usually run 16
or 8-wide depending on register usage.
Don't worry; you are not the first person to have this problem. I can't speak
for D3D12 but for Vulkan we do have something in the works which provides more
explicit control over subgroup sizes so that you can really know what you're
getting. Unfortunately, I can't really provide a timeline as to when it will
be available.</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are the assignee for the bug.</li>
<li>You are the QA Contact for the bug.</li>
</ul>
</body>
</html>