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Vulkan: Select device with env variable, and skip initialize for unused devices. #629

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Vulkan: Select device with env variable, and skip initialize for unused devices. #629

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Vulkan: Select device with env variable, and do not initialize unused…
stduhpf Mar 14, 2025
d7a0a4d
better logging and exception handling
stduhpf Mar 16, 2025
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22 changes: 21 additions & 1 deletion stable-diffusion.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -172,7 +172,27 @@ class StableDiffusionGGML {
#endif
#ifdef SD_USE_VULKAN
LOG_DEBUG("Using Vulkan backend");
for (int device = 0; device < ggml_backend_vk_get_device_count(); ++device) {
size_t device = 0;
const int device_count = ggml_backend_vk_get_device_count();
if (device_count) {
const char* SD_VK_DEVICE = getenv("SD_VK_DEVICE");
if (SD_VK_DEVICE != nullptr) {
std::string sd_vk_device_str = SD_VK_DEVICE;
try {
device = std::stoull(sd_vk_device_str);
} catch (const std::invalid_argument&) {
LOG_WARN("SD_VK_DEVICE environment variable is not a valid integer (%s). Falling back to device 0.", SD_VK_DEVICE);
device = 0;
} catch (const std::out_of_range&) {
LOG_WARN("SD_VK_DEVICE environment variable value is out of range for `unsigned long long` type (%s). Falling back to device 0.", SD_VK_DEVICE);
device = 0;
}
if (device >= device_count) {
LOG_WARN("Cannot find targeted vulkan device (%llu). Falling back to device 0.", device);
device = 0;
}
}
LOG_INFO("Vulkan: Using device %llu", device);
backend = ggml_backend_vk_init(device);
}
if (!backend) {
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