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vulkan: add environment variable to avoid VRAM allocation #11592

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Merged
merged 1 commit into from
Feb 10, 2025
Merged

vulkan: add environment variable to avoid VRAM allocation #11592

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8 changes: 7 additions & 1 deletion ggml/src/ggml-vulkan/ggml-vulkan.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -166,6 +166,7 @@ struct vk_device_struct {
uint32_t subgroup_size;
uint32_t shader_core_count;
bool uma;
bool prefer_host_memory;
bool float_controls_rte_fp16;

bool subgroup_size_control;
Expand Down Expand Up @@ -1293,7 +1294,9 @@ static vk_buffer ggml_vk_create_buffer_check(vk_device& device, size_t size, vk:
static vk_buffer ggml_vk_create_buffer_device(vk_device& device, size_t size) {
vk_buffer buf;
try {
if (device->uma) {
if (device->prefer_host_memory) {
buf = ggml_vk_create_buffer(device, size, vk::MemoryPropertyFlagBits::eHostVisible | vk::MemoryPropertyFlagBits::eHostCoherent, vk::MemoryPropertyFlagBits::eDeviceLocal);
} 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 {
Expand Down Expand Up @@ -2188,6 +2191,9 @@ static vk_device ggml_vk_get_device(size_t idx) {
device->physical_device = physical_devices[dev_num];
const std::vector<vk::ExtensionProperties> ext_props = device->physical_device.enumerateDeviceExtensionProperties();

const char* GGML_VK_PREFER_HOST_MEMORY = getenv("GGML_VK_PREFER_HOST_MEMORY");
device->prefer_host_memory = GGML_VK_PREFER_HOST_MEMORY != nullptr;

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