vulkan: add environment variable GGML_VK_PREFER_HOST_MEMORY to avoid VRAM allocation (#11592)
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1 changed files with 7 additions and 1 deletions
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@ -167,6 +167,7 @@ struct vk_device_struct {
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uint32_t subgroup_size;
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uint32_t shader_core_count;
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bool uma;
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bool prefer_host_memory;
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bool float_controls_rte_fp16;
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bool subgroup_size_control;
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@ -1294,7 +1295,9 @@ static vk_buffer ggml_vk_create_buffer_check(vk_device& device, size_t size, vk:
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static vk_buffer ggml_vk_create_buffer_device(vk_device& device, size_t size) {
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vk_buffer buf;
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try {
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if (device->uma) {
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if (device->prefer_host_memory) {
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buf = ggml_vk_create_buffer(device, size, vk::MemoryPropertyFlagBits::eHostVisible | vk::MemoryPropertyFlagBits::eHostCoherent, vk::MemoryPropertyFlagBits::eDeviceLocal);
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} else if (device->uma) {
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// Fall back to host memory type
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buf = ggml_vk_create_buffer(device, size, vk::MemoryPropertyFlagBits::eDeviceLocal, vk::MemoryPropertyFlagBits::eHostVisible | vk::MemoryPropertyFlagBits::eHostCoherent);
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} else {
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@ -2199,6 +2202,9 @@ static vk_device ggml_vk_get_device(size_t idx) {
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device->physical_device = physical_devices[dev_num];
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const std::vector<vk::ExtensionProperties> ext_props = device->physical_device.enumerateDeviceExtensionProperties();
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const char* GGML_VK_PREFER_HOST_MEMORY = getenv("GGML_VK_PREFER_HOST_MEMORY");
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device->prefer_host_memory = GGML_VK_PREFER_HOST_MEMORY != nullptr;
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bool fp16_storage = false;
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bool fp16_compute = false;
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bool maintenance4_support = false;
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