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vulkan: fix GPU deduplication logic. (#19222) 

* vulkan: fix GPU deduplication logic.

As reported in https://github.com/ggml-org/llama.cpp/issues/19221, the
(same uuid, same driver) logic is problematic for windows+intel igpu.

Let's just avoid filtering for MoltenVK which is apple-specific, and
keep the logic the  same as before 88d23ad5 - just dedup based on UUID.

Verified that MacOS + 4xVega still reports 4 GPUs with this version.

* vulkan: only skip dedup when both drivers are moltenVk
This commit is contained in:
Oleksandr Kuvshynov 2026-02-05 03:06:59 -05:00 committed by GitHub
parent 3409ab842d
commit a498c75ad1
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1 changed files with 5 additions and 7 deletions
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12
ggml/src/ggml-vulkan/ggml-vulkan.cpp
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@ -5561,9 +5561,9 @@ static void ggml_vk_instance_init() {
// Check if there are two physical devices corresponding to the same GPU
// This handles the case where the same GPU appears with different drivers (e.g., RADV + AMDVLK on Linux),
// see https://github.com/ggml-org/llama.cpp/pull/7582 for original deduplication.
// However, for MoltenVK on macOS, multiple GPUs on the same card may report the same UUID,
// see https://github.com/KhronosGroup/MoltenVK/issues/2683. Until this is fixed, we'll only deduplicate
// when drivers differ (same driver + same UUID = likely different GPUs)
// MoltenVK on macOS may report the same UUID for distinct GPUs on multi-GPU cards,
// see https://github.com/KhronosGroup/MoltenVK/issues/2683. Skip when both old/new
// driver is MoltenVK
auto old_device = std::find_if(
vk_instance.device_indices.begin(),
vk_instance.device_indices.end(),
@ -5580,11 +5580,9 @@ static void ggml_vk_instance_init() {
old_id.deviceLUIDValid && new_id.deviceLUIDValid &&
std::equal(std::begin(old_id.deviceLUID), std::end(old_id.deviceLUID), std::begin(new_id.deviceLUID))
);
bool both_molten_vk = (new_driver.driverID == vk::DriverId::eMoltenvk && old_driver.driverID == vk::DriverId::eMoltenvk);
// Only deduplicate if same UUID AND different drivers
// (same driver + same UUID on MoltenVK = likely different GPUs on multi-GPU card)
bool different_driver = (old_driver.driverID != new_driver.driverID);
return same_uuid && different_driver;
return same_uuid && !both_molten_vk;
}
);
if (old_device == vk_instance.device_indices.end()) {