Files
xserv/crates/xserv-cuda/src/device.rs

92 lines
2.8 KiB
Rust

use crate::error::{self, Result};
use crate::ffi;
use std::ffi::CStr;
use std::os::raw::c_char;
#[derive(Debug, Clone)]
pub struct DeviceInfo {
pub index: u32,
pub name: String,
pub total_memory: usize,
pub free_memory: usize,
pub compute_major: i32,
pub compute_minor: i32,
pub sm_count: i32,
pub shared_mem_per_block: usize,
pub warp_size: i32,
pub max_threads_per_block: i32,
}
unsafe extern "C" {
fn cudaDeviceGetAttribute(value: *mut i32, attr: i32, device: i32) -> i32;
fn cudaMemGetInfo(free: *mut usize, total: *mut usize) -> i32;
}
fn get_attr(attr: i32, device: u32) -> Result<i32> {
let mut value = 0;
error::check(unsafe { cudaDeviceGetAttribute(&mut value, attr, device as i32) })?;
Ok(value)
}
pub fn device_count() -> Result<i32> {
let mut count = 0;
error::check(unsafe { ffi::cudaGetDeviceCount(&mut count) })?;
Ok(count)
}
pub fn set_device(device: u32) -> Result<()> {
error::check(unsafe { ffi::cudaSetDevice(device as i32) })
}
pub fn current_device() -> Result<u32> {
let mut dev = 0;
error::check(unsafe { ffi::cudaGetDevice(&mut dev) })?;
Ok(dev as u32)
}
pub fn device_info(device: u32) -> Result<DeviceInfo> {
// Heap-allocate oversized buffer for cudaDeviceProp (layout varies by CUDA version).
// CUDA 12.x struct is ~5-6 KB; use 32 KB to guard against future growth.
let mut prop_buf = vec![0u8; 32768];
error::check(unsafe { ffi::cudaGetDeviceProperties(prop_buf.as_mut_ptr(), device as i32) })?;
// Name is always the first field: char[256].
let name = unsafe { CStr::from_ptr(prop_buf.as_ptr() as *const c_char) }
.to_string_lossy()
.into_owned();
// Get memory info via cudaMemGetInfo (layout-independent).
let prev = current_device()?;
set_device(device)?;
let mut free = 0usize;
let mut total = 0usize;
error::check(unsafe { cudaMemGetInfo(&mut free, &mut total) })?;
if prev != device {
set_device(prev)?;
}
// Attribute IDs from cuda_runtime_api.h
const SHARED_MEM_PER_BLOCK: i32 = 8;
const WARP_SIZE: i32 = 10;
const MAX_THREADS_PER_BLOCK: i32 = 1;
const MULTI_PROCESSOR_COUNT: i32 = 16;
const COMPUTE_MAJOR: i32 = 75;
const COMPUTE_MINOR: i32 = 76;
Ok(DeviceInfo {
index: device,
name,
total_memory: total,
free_memory: free,
compute_major: get_attr(COMPUTE_MAJOR, device)?,
compute_minor: get_attr(COMPUTE_MINOR, device)?,
sm_count: get_attr(MULTI_PROCESSOR_COUNT, device)?,
shared_mem_per_block: get_attr(SHARED_MEM_PER_BLOCK, device)? as usize,
warp_size: get_attr(WARP_SIZE, device)?,
max_threads_per_block: get_attr(MAX_THREADS_PER_BLOCK, device)?,
})
}
pub fn synchronize() -> Result<()> {
error::check(unsafe { ffi::cudaDeviceSynchronize() })
}