cublas_rotm_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 = double;

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

    /*
     *   A = | 1.0 2.0 3.0 4.0 |
     *   B = | 5.0 6.0 7.0 8.0 |
     */

    std::vector<data_type> A = {1.0, 2.0, 3.0, 4.0};
    std::vector<data_type> B = {5.0, 6.0, 7.0, 8.0};
    std::vector<data_type> param = {1.0, 5.0, 6.0, 7.0, 8.0}; // flag = param[0]
    const int incx = 1;
    const int incy = 1;

    data_type *d_A = nullptr;
    data_type *d_B = nullptr;

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

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

    printf("param\n");
    print_vector(param.size(), param.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_B), sizeof(data_type) * B.size()));

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

    /* step 3: compute */
    CUBLAS_CHECK(cublasDrotm(cublasH, A.size(), d_A, incx, d_B, incy, param.data()));

    /* step 4: copy data to host */
    CUDA_CHECK(cudaMemcpyAsync(A.data(), d_A, sizeof(data_type) * A.size(), cudaMemcpyDeviceToHost,
                               stream));
    CUDA_CHECK(cudaMemcpyAsync(B.data(), d_B, sizeof(data_type) * B.size(), cudaMemcpyDeviceToHost,
                               stream));

    CUDA_CHECK(cudaStreamSynchronize(stream));

    /*
     *   A = | 10.0 16.0 22.0 28.0 |
     *   B = | 39.0 46.0 53.0 60.0 |
     */

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

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

    /* free resources */
    CUDA_CHECK(cudaFree(d_A));
    CUDA_CHECK(cudaFree(d_B));

    CUBLAS_CHECK(cublasDestroy(cublasH));

    CUDA_CHECK(cudaStreamDestroy(stream));

    CUDA_CHECK(cudaDeviceReset());

    return EXIT_SUCCESS;
}