cublas_hbmv_example.cu

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#include <cstdio>
#include <cstdlib>
#include <vector>

#include <cublas_v2.h>
#include <cuda_runtime.h>

#include "cublas_utils.h"

using data_type = cuDoubleComplex;

int main(int argc, char *argv[]) {
    cublasHandle_t cublasH = NULL;
    cudaStream_t stream = NULL;

    const int m = 2;
    const int n = 2;
    const int k = 1;
    const int lda = m;

    /*
     *   A = | 1.1 + 1.2j | 2.3 + 2.4j |
     *       | 3.5 + 3.6j | 4.7 + 4.8j |
     *   x = | 5.1 + 6.2j | 7.3 + 8.4j |
     */

    const std::vector<data_type> A = {{1.1, 1.2}, {3.5, 3.6}, {2.3, 2.4}, {4.7, 4.8}};
    const std::vector<data_type> x = {{5.1, 6.2}, {7.3, 8.4}};
    std::vector<data_type> y(m);
    const data_type alpha = {1.0, 1.0};
    const data_type beta = {0.0, 0.0};
    const int incx = 1;
    const int incy = 1;

    data_type *d_A = nullptr;
    data_type *d_x = nullptr;
    data_type *d_y = nullptr;

    cublasFillMode_t uplo = CUBLAS_FILL_MODE_UPPER;

    printf("A\n");
    print_matrix(m, n, A.data(), lda);
    printf("=====\n");

    printf("x\n");
    print_vector(x.size(), x.data());
    printf("=====\n");

    /* step 1: create cublas handle, bind a stream */
    CUBLAS_CHECK(cublasCreate(&cublasH));

    CUDA_CHECK(cudaStreamCreateWithFlags(&stream, cudaStreamNonBlocking));
    CUBLAS_CHECK(cublasSetStream(cublasH, stream));

    /* step 2: copy data to device */
    CUDA_CHECK(cudaMalloc(reinterpret_cast<void **>(&d_A), sizeof(data_type) * A.size()));
    CUDA_CHECK(cudaMalloc(reinterpret_cast<void **>(&d_x), sizeof(data_type) * x.size()));
    CUDA_CHECK(cudaMalloc(reinterpret_cast<void **>(&d_y), sizeof(data_type) * y.size()));

    CUDA_CHECK(cudaMemcpyAsync(d_A, A.data(), sizeof(data_type) * A.size(), cudaMemcpyHostToDevice,
                               stream));
    CUDA_CHECK(cudaMemcpyAsync(d_x, x.data(), sizeof(data_type) * x.size(), cudaMemcpyHostToDevice,
                               stream));

    /* step 3: compute */
    CUBLAS_CHECK(cublasZhbmv(cublasH, uplo, n, k, &alpha, d_A, lda, d_x, incx, &beta, d_y, incy));

    /* step 4: copy data to host */
    CUDA_CHECK(cudaMemcpyAsync(y.data(), d_y, sizeof(data_type) * y.size(), cudaMemcpyDeviceToHost,
                               stream));

    CUDA_CHECK(cudaStreamSynchronize(stream));

    /*
     *   y = | -44.06 + 73.02j 19.42 + 102.42j |
     */

    printf("y\n");
    print_vector(y.size(), y.data());
    printf("=====\n");

    /* free resources */
    CUDA_CHECK(cudaFree(d_A));
    CUDA_CHECK(cudaFree(d_x));
    CUDA_CHECK(cudaFree(d_y));

    CUBLAS_CHECK(cublasDestroy(cublasH));

    CUDA_CHECK(cudaStreamDestroy(stream));

    CUDA_CHECK(cudaDeviceReset());

    return EXIT_SUCCESS;
}