rocm-systems/projects/hip-tests/catch/unit/module/hipExtLaunchMultiKernelMultiDevFunctional.cc

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#include <hip_test_common.hh>
#include <hip_test_defgroups.hh>

/**
 * @addtogroup hipExtLaunchMultiKernelMultiDevice
 * @{
 * @ingroup ModuleTest
 * `hipError_t hipExtLaunchMultiKernelMultiDevice(hipLaunchParams* launchParamsList,
 *                                          int  numDevices, unsigned int  flags)` -
 * Launches kernels on multiple devices and guarantees all specified kernels are dispatched
 * on respective streams before enqueuing any other work on the specified streams from any
 * other threads
 */

/**
 * Test Description
 * ------------------------
 * - Test case to Launche Multiple kernels on single device or multiple devices.
 * Test source
 * ------------------------
 * - catch/unit/module/hipExtLaunchMultiKernelMultiDevice.cc
 * Test requirements
 * ------------------------
 * - HIP_VERSION >= 5.6
 */

// Square each element in the array A and write to array C.
#define NUM_KERNEL_ARGS 3
__global__ void vector_square(float* C_d, float* A_d, size_t N) {
  size_t offset = (blockIdx.x * blockDim.x + threadIdx.x);
  size_t stride = blockDim.x * gridDim.x;

  for (size_t i = offset; i < N; i += stride) {
    C_d[i] = A_d[i] * A_d[i];
  }
}

TEST_CASE("Unit_hipExtLaunchMultiKernelMultiDevice_Functional", "[multigpu]") {
  constexpr int MAX_GPUS = 8;
  float *A_d[MAX_GPUS], *C_d[MAX_GPUS];
  float *A_h, *C_h;
  size_t N = 1000000;
  size_t Nbytes = N * sizeof(float);

  int nGpu = 0;
  HIP_CHECK(hipGetDeviceCount(&nGpu));
  if (nGpu < 1) {
    INFO("info: didn't find any GPU!\n");
    REQUIRE(false);
  }
  if (nGpu > MAX_GPUS) {
    nGpu = MAX_GPUS;
  }
  A_h = reinterpret_cast<float*>(malloc(Nbytes));
  HIP_CHECK(A_h == 0 ? hipErrorOutOfMemory : hipSuccess);
  C_h = reinterpret_cast<float*>(malloc(Nbytes));
  HIP_CHECK(C_h == 0 ? hipErrorOutOfMemory : hipSuccess);
  // Fill with Phi + i
  for (size_t i = 0; i < N; i++) {
    A_h[i] = 1.618f + i;
  }

  const unsigned blocks = 512;
  const unsigned threadsPerBlock = 256;

  hipStream_t stream[MAX_GPUS];
  for (int i = 0; i < nGpu; i++) {
    HIP_CHECK(hipSetDevice(i));
    HIP_CHECK(hipStreamCreateWithFlags(&stream[i], hipStreamNonBlocking));

    hipDeviceProp_t props;
    HIP_CHECK(hipGetDeviceProperties(&props, i));
    HIP_CHECK(hipMalloc(&A_d[i], Nbytes));
    HIP_CHECK(hipMalloc(&C_d[i], Nbytes));


    INFO("info: copy Host2Device\n");
    HIP_CHECK(hipMemcpy(A_d[i], A_h, Nbytes, hipMemcpyHostToDevice));
  }

  hipLaunchParams* launchParamsList =
      reinterpret_cast<hipLaunchParams*>(malloc(sizeof(hipLaunchParams) * nGpu));

  void* args[MAX_GPUS * NUM_KERNEL_ARGS];

  for (int i = 0; i < nGpu; i++) {
    args[i * NUM_KERNEL_ARGS] = &C_d[i];
    args[i * NUM_KERNEL_ARGS + 1] = &A_d[i];
    args[i * NUM_KERNEL_ARGS + 2] = &N;
    launchParamsList[i].func = reinterpret_cast<void*>(vector_square);
    launchParamsList[i].gridDim = dim3(blocks);
    launchParamsList[i].blockDim = dim3(threadsPerBlock);
    launchParamsList[i].sharedMem = 0;
    launchParamsList[i].stream = stream[i];
    launchParamsList[i].args = args + i * NUM_KERNEL_ARGS;
  }

  INFO("info: launch vector_square kernel with");
  INFO("hipExtLaunchMultiKernelMultiDevice API\n");
  HIP_CHECK(hipExtLaunchMultiKernelMultiDevice(launchParamsList, nGpu, 0));

  for (int j = 0; j < nGpu; j++) {
    HIP_CHECK(hipStreamSynchronize(stream[j]));
    HIP_CHECK(hipStreamDestroy(stream[j]));

    hipDeviceProp_t props;
    HIP_CHECK(hipGetDeviceProperties(&props, j));
    INFO("info: copy Device2Host\n");
    HIP_CHECK(hipSetDevice(j));
    HIP_CHECK(hipMemcpy(C_h, C_d[j], Nbytes, hipMemcpyDeviceToHost));

    INFO("info: check result\n");
    for (size_t i = 0; i < N; i++) {
      REQUIRE(fabs(C_h[i] - (A_h[i] * A_h[i])) < 0.00000000001);
    }

    HIP_CHECK(hipFree(A_d[j]));
    HIP_CHECK(hipFree(C_d[j]));
  }

  free(A_h);
  free(C_h);
  free(launchParamsList);
}