Selecting OpenCL device? about emu HOT 1 OPEN

#[gpu_use]
fn main() {
    let mut data = vec![0.0; 1000];

    gpu_do!(load(data));
    gpu_do!(launch());
    for i in 0..1000 {
        data[i] = data[i] + 0.1;
    }
    gpu_do!(read(data));
}

#[gpu_use("nvidia", "nvidia")] // initialize first 2 devices with names containing substring "nvidia"
fn main() {
    let mut a = vec![0.0; 1000];
    let mut b = vec![0.0; 1000];
    let mut c = vec![0.0; 1000];

    gpu_do!(open(1)); // specify that 2nd in initialized list should be used; if not specified, default is 1st in initialized list to be used
    gpu_do!(load_async(a));
    gpu_do!(load_async(b));
    gpu_do!(load_async(c)); // all of a, b, c can be loaded asynchronously
    gpu_do!(await()); // wait for all loading to finish
    gpu_do!(launch()); // this could also be launch_async if we wanted to do something while running on GPU
    for i in 0..1000 {
        c[i] = a[i] + b[i];
    }
    gpu_do!(read_async(data)); // reading can be async while we do some computation until we actually need the data
}