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vulkan: Warptile tuning for Intel Xe2/Xe3 #18178

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vulkan: Warptile tuning for Intel Xe2/Xe3 #18178

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0f82d0a
modify warptile tuning for xe3
virajwad Dec 15, 2025
c908711
intel vendor check w/ coopmat support
virajwad Dec 17, 2025
3441283
fix back formatting
virajwad Dec 17, 2025
6b7f1e8
fix formatting change 2
virajwad Dec 17, 2025
0cfa616
move intel check to chip specific tuning part
virajwad Dec 18, 2025
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22 changes: 15 additions & 7 deletions ggml/src/ggml-vulkan/ggml-vulkan.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2838,18 +2838,26 @@ static void ggml_vk_load_shaders(vk_device& device) {
m_warptile_mmqid_int_k = { 128, 64, 64, 32, mul_mat_subgroup_size_16, 32, 1, 2, 2, 1, mul_mat_subgroup_size_16 };
s_warptile_mmqid_int_k = { mul_mat_subgroup_size_32, 32, 32, 32, 32, 32, 1, 2, 1, 1, mul_mat_subgroup_size_16 };

l_mmq_wg_denoms = l_wg_denoms = { 128, 128, 1 };
m_mmq_wg_denoms = m_wg_denoms = { 64, 64, 1 };
s_mmq_wg_denoms = s_wg_denoms = { 32, 32, 1 };
l_align = 128;
m_align = 64;
s_align = 32;

// chip specific tuning
if ((device->architecture == AMD_GCN) && (device->driver_id != vk::DriverId::eAmdProprietary)) {
m_warptile_mmq = m_warptile_mmq_int = { 256, 64, 64, 32, 16, 16, 2, 2, 2, 1, 16 };
m_warptile_mmqid = m_warptile_mmqid_int = { 256, 64, 64, 32, 16, 16, 2, 2, 2, 1, 16 };
}

l_mmq_wg_denoms = l_wg_denoms = {128, 128, 1 };
m_mmq_wg_denoms = m_wg_denoms = { 64, 64, 1 };
s_mmq_wg_denoms = s_wg_denoms = { 32, 32, 1 };
l_align = 128;
m_align = 64;
s_align = 32;
else if ((device->vendor_id == VK_VENDOR_ID_INTEL) && (device->driver_id == vk::DriverId::eIntelProprietaryWindows)) {
if (device->coopmat_support && device->architecture == INTEL_XE2) {
// Xe2/Xe3 with coopmat enabled - warptile performance tuning
m_warptile = { 512, 128, 128, 16, subgroup_size_8, 32, 2, tm_m, tn_m, tk_m, subgroup_size_8 };
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@jeffbolznv jeffbolznv Dec 18, 2025

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I wonder if this should actually be the large tile size?

Also, a quick google search suggests Xe2 has 64KB of register file per core, which with 512 invocations is only 32 registers each which seems very low. But I've never worked on this hardware so I'm just speculating.

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@virajwad virajwad Dec 18, 2025 •
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Hi @jeffbolznv Sure I can look at re-enabling large warptile size for Intel here and then moving the warptile config from m_ to l_. I'll also check perf again after the change.

Are you doing (64 * 1024) / 512 invocations is 128 bytes per invocation and the assumption is 4 byte width register? (to get 32 registers per invocation?)

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@jeffbolznv jeffbolznv Dec 18, 2025

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Yes, that's the calculation I did.

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@virajwad virajwad Dec 18, 2025

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Thanks Jeff, for Xe architecture each register in GRF was 32 Byte wide. But I need to look into the register situation a bit deeper

m_warptile_mmq = { 512, 128, 128, 32, subgroup_size_8, 32, 2, tm_m, tn_m, tk_m, subgroup_size_8 };
m_mmq_wg_denoms = m_wg_denoms = { 128, 128, 1 };
}
}

for (uint32_t i = 0; i < GGML_TYPE_COUNT; ++i) {
ggml_type t = (ggml_type)i;
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