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vulkan: Add env var to disable host visible vidmem #15109

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Merged
merged 1 commit into from
Aug 7, 2025
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vulkan: Add env var to disable host visible vidmem #15109

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6 changes: 6 additions & 0 deletions ggml/src/ggml-vulkan/ggml-vulkan.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -534,6 +534,7 @@ struct vk_device_struct {
ggml_backend_buffer_type buffer_type;

bool disable_fusion;
bool disable_host_visible_vidmem;

#ifdef GGML_VULKAN_MEMORY_DEBUG
std::unique_ptr<vk_memory_logger> memory_logger;
Expand Down Expand Up @@ -1804,6 +1805,8 @@ static vk_buffer ggml_vk_create_buffer_device(vk_device& device, size_t size) {
} else if (device->uma) {
// Fall back to host memory type
buf = ggml_vk_create_buffer(device, size, vk::MemoryPropertyFlagBits::eDeviceLocal, vk::MemoryPropertyFlagBits::eHostVisible | vk::MemoryPropertyFlagBits::eHostCoherent);
} else if (device->disable_host_visible_vidmem) {
buf = ggml_vk_create_buffer(device, size, vk::MemoryPropertyFlagBits::eDeviceLocal, vk::MemoryPropertyFlagBits::eDeviceLocal);
} else {
// use rebar if available, otherwise fallback to device only visible memory
buf = ggml_vk_create_buffer(device, size, vk::MemoryPropertyFlagBits::eDeviceLocal | vk::MemoryPropertyFlagBits::eHostVisible | vk::MemoryPropertyFlagBits::eHostCoherent, vk::MemoryPropertyFlagBits::eDeviceLocal);
Expand Down Expand Up @@ -3265,6 +3268,9 @@ static vk_device ggml_vk_get_device(size_t idx) {
const char* GGML_VK_PREFER_HOST_MEMORY = getenv("GGML_VK_PREFER_HOST_MEMORY");
device->prefer_host_memory = GGML_VK_PREFER_HOST_MEMORY != nullptr;

const char* GGML_VK_DISABLE_HOST_VISIBLE_VIDMEM = getenv("GGML_VK_DISABLE_HOST_VISIBLE_VIDMEM");
device->disable_host_visible_vidmem = GGML_VK_DISABLE_HOST_VISIBLE_VIDMEM != nullptr;

bool fp16_storage = false;
bool fp16_compute = false;
bool maintenance4_support = false;
Expand Down
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