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//! Devices on which tensor computations are run.
/// A torch device.
#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
pub enum Device {
/// The main CPU device.
Cpu,
/// The main GPU device.
Cuda(usize),
/// The main MPS device.
Mps,
/// The main Vulkan device.
Vulkan,
}
/// Cuda related helper functions.
pub enum Cuda {}
impl Cuda {
/// Returns the number of CUDA devices available.
pub fn device_count() -> i64 {
let res = unsafe_torch!(torch_sys::cuda::atc_cuda_device_count());
i64::from(res)
}
/// Returns true if at least one CUDA device is available.
pub fn is_available() -> bool {
unsafe_torch!(torch_sys::cuda::atc_cuda_is_available()) != 0
}
/// Returns true if CUDA is available, and CuDNN is available.
pub fn cudnn_is_available() -> bool {
unsafe_torch!(torch_sys::cuda::atc_cudnn_is_available()) != 0
}
/// Sets the seed for the current GPU.
///
/// # Arguments
///
/// * `seed` - An unsigned 64bit int to be used as seed.
pub fn manual_seed(seed: u64) {
unsafe_torch!(torch_sys::cuda::atc_manual_seed(seed));
}
/// Sets the seed for all available GPUs.
///
/// # Arguments
///
/// * `seed` - An unsigned 64bit int to be used as seed.
pub fn manual_seed_all(seed: u64) {
unsafe_torch!(torch_sys::cuda::atc_manual_seed_all(seed));
}
/// Waits for all kernels in all streams on a CUDA device to complete.
///
/// # Arguments
///
/// * `device_index` - A signed 64bit int to indice which device to wait for.
pub fn synchronize(device_index: i64) {
unsafe_torch!(torch_sys::cuda::atc_synchronize(device_index));
}
/// Returns true if cudnn is enabled by the user.
///
/// This does not indicate whether cudnn is actually usable.
pub fn user_enabled_cudnn() -> bool {
unsafe_torch!(torch_sys::cuda::atc_user_enabled_cudnn()) != 0
}
/// Enable or disable cudnn.
pub fn set_user_enabled_cudnn(b: bool) {
unsafe_torch!(torch_sys::cuda::atc_set_user_enabled_cudnn(i32::from(b)))
}
/// Sets cudnn benchmark mode.
///
/// When set cudnn will try to optimize the generators durning
/// the first network runs and then use the optimized architecture
/// in the following runs. This can result in significant performance
/// improvements.
pub fn cudnn_set_benchmark(b: bool) {
unsafe_torch!(torch_sys::cuda::atc_set_benchmark_cudnn(i32::from(b)))
}
}
impl Device {
pub(super) fn c_int(self) -> libc::c_int {
match self {
Device::Cpu => -1,
Device::Cuda(device_index) => device_index as libc::c_int,
Device::Mps => -2,
Device::Vulkan => -3,
}
}
pub(super) fn from_c_int(v: libc::c_int) -> Self {
match v {
-1 => Device::Cpu,
-2 => Device::Mps,
-3 => Device::Vulkan,
index if index >= 0 => Device::Cuda(index as usize),
_ => panic!("unexpected device {v}"),
}
}
/// Returns a GPU device if available, else default to CPU.
pub fn cuda_if_available() -> Device {
if Cuda::is_available() {
Device::Cuda(0)
} else {
Device::Cpu
}
}
pub fn is_cuda(self) -> bool {
match self {
Device::Cuda(_) => true,
Device::Cpu | Device::Mps | Device::Vulkan => false,
}
}
}