rocm-systems/tests/src/deviceLib/hip_test_syncthreads_count.cpp

/*
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/* HIT_START
 * BUILD: %t %s ../test_common.cpp
 * TEST: %t
 * HIT_END
 */

#include <hip/hip_runtime.h>
#include "test_common.h"

#define ASSERT_EQUAL(lhs, rhs) assert(lhs == rhs)

static __global__
void kernel_syncthreads_count(int *syncTestD,
                              int *allThreadsZeroD,
                              int *allThreadsOneD,
                              int *oddThreadsOneD,
                              int *allThreadsMinusOneD,
                              int *allThreadsIdD)
{
  int blockSize = blockDim.x;
  int predicate = 10;
  // First block index starts with 0, and second block index starts
  // with blockSize
  int i = (blockIdx.x == 0) ? threadIdx.x : blockSize + threadIdx.x;

  // At very first, we need to ensure work-group level syncronization
  // properly happened, don't bother about predicate testing for now.
  // Thread 0 and thread 1 writes to shared memory. After call to api,
  // every thread reads shared memory, and store sum for verification
  __shared__ int sm[2];
  if (threadIdx.x == 0)
    sm[0] = 10;
  else if (threadIdx.x == 1)
    sm[1] = 20;
  __syncthreads_count(predicate);
  syncTestD[i] = sm[0] + sm[1];

  // All threads pass 0 as predicate value, result should be 0
  predicate = 0;
  allThreadsZeroD[i] = __syncthreads_count(predicate);

  // All threads pass 1 as predicate value, result should be blockSize
  predicate = 1;
  allThreadsOneD[i] = __syncthreads_count(predicate);

  // Odd numbered threads pass 1, and even numbered threads pass 0, as
  // predicate value, result should be blockSize / 2
  predicate = threadIdx.x % 2;
  oddThreadsOneD[i] = __syncthreads_count(predicate);

  // All threads pass -1 as predicate value, result should blockSize
  predicate = -1;
  allThreadsMinusOneD[i] = __syncthreads_count(predicate);

  // Each thread pass its ID as predicate value, result should be blockSize - 1
  predicate = threadIdx.x;
  allThreadsIdD[i] = __syncthreads_count(predicate);
}

void test_syncthreads_count(int blockSize)
{
  int nBytes = sizeof(int) * 2 * blockSize;
  int * syncTestD, *syncTestH;
  int *allThreadsZeroD, *allThreadsZeroH;
  int *allThreadsOneD, *allThreadsOneH;
  int *oddThreadsOneD, *oddThreadsOneH;
  int *allThreadsMinusOneD, *allThreadsMinusOneH;
  int *allThreadsIdD, *allThreadsIdH;

  // Allocate device memory
  ASSERT_EQUAL(hipMalloc((void**)&syncTestD, nBytes), hipSuccess);
  ASSERT_EQUAL(hipMalloc((void**)&allThreadsZeroD, nBytes), hipSuccess);
  ASSERT_EQUAL(hipMalloc((void**)&allThreadsOneD, nBytes), hipSuccess);
  ASSERT_EQUAL(hipMalloc((void**)&oddThreadsOneD, nBytes), hipSuccess);
  ASSERT_EQUAL(hipMalloc((void**)&allThreadsMinusOneD, nBytes), hipSuccess);
  ASSERT_EQUAL(hipMalloc((void**)&allThreadsIdD, nBytes), hipSuccess);

  // Allocate host memory
  ASSERT_EQUAL(hipHostMalloc((void**)&syncTestH, nBytes), hipSuccess);
  ASSERT_EQUAL(hipHostMalloc((void**)&allThreadsZeroH, nBytes), hipSuccess);
  ASSERT_EQUAL(hipHostMalloc((void**)&allThreadsOneH, nBytes), hipSuccess);
  ASSERT_EQUAL(hipHostMalloc((void**)&oddThreadsOneH, nBytes), hipSuccess);
  ASSERT_EQUAL(hipHostMalloc((void**)&allThreadsMinusOneH, nBytes), hipSuccess);
  ASSERT_EQUAL(hipHostMalloc((void**)&allThreadsIdH, nBytes), hipSuccess);

  // Launch Kernel
  hipLaunchKernelGGL(kernel_syncthreads_count,
                     2,
                     blockSize,
                     0,
                     0,
                     syncTestD,
                     allThreadsZeroD,
                     allThreadsOneD,
                     oddThreadsOneD,
                     allThreadsMinusOneD,
                     allThreadsIdD);

  // Copy result from device to host
  ASSERT_EQUAL(hipMemcpy(syncTestH, syncTestD, nBytes, hipMemcpyDeviceToHost),
               hipSuccess);
  ASSERT_EQUAL(hipMemcpy(allThreadsZeroH, allThreadsZeroD, nBytes, hipMemcpyDeviceToHost),
               hipSuccess);
  ASSERT_EQUAL(hipMemcpy(allThreadsOneH, allThreadsOneD, nBytes, hipMemcpyDeviceToHost),
               hipSuccess);
  ASSERT_EQUAL(hipMemcpy(oddThreadsOneH, oddThreadsOneD, nBytes, hipMemcpyDeviceToHost),
               hipSuccess);
  ASSERT_EQUAL(hipMemcpy(allThreadsMinusOneH, allThreadsMinusOneD, nBytes, hipMemcpyDeviceToHost),
               hipSuccess);
  ASSERT_EQUAL(hipMemcpy(allThreadsIdH, allThreadsIdD, nBytes, hipMemcpyDeviceToHost),
               hipSuccess);

  // Validate results for both the blocks together
  for (int i = 0; i < 2 * blockSize; ++i) {
    ASSERT_EQUAL(syncTestH[i], 30);
    ASSERT_EQUAL(allThreadsZeroH[i], 0);
    ASSERT_EQUAL(allThreadsOneH[i], blockSize);
    ASSERT_EQUAL(oddThreadsOneH[i], blockSize / 2);
    ASSERT_EQUAL(allThreadsMinusOneH[i], blockSize);
    ASSERT_EQUAL(allThreadsIdH[i], (blockSize-1));
  }

  // Free device memory
  ASSERT_EQUAL(hipFree(syncTestD), hipSuccess);
  ASSERT_EQUAL(hipFree(allThreadsZeroD), hipSuccess);
  ASSERT_EQUAL(hipFree(allThreadsOneD), hipSuccess);
  ASSERT_EQUAL(hipFree(oddThreadsOneD), hipSuccess);
  ASSERT_EQUAL(hipFree(allThreadsMinusOneD), hipSuccess);
  ASSERT_EQUAL(hipFree(allThreadsIdD), hipSuccess);

  //Free host memory
  ASSERT_EQUAL(hipHostFree(syncTestH), hipSuccess);
  ASSERT_EQUAL(hipHostFree(allThreadsZeroH), hipSuccess);
  ASSERT_EQUAL(hipHostFree(allThreadsOneH), hipSuccess);
  ASSERT_EQUAL(hipHostFree(oddThreadsOneH), hipSuccess);
  ASSERT_EQUAL(hipHostFree(allThreadsMinusOneH), hipSuccess);
  ASSERT_EQUAL(hipHostFree(allThreadsIdH), hipSuccess);
}

int main()
{
  int blockSizes[] = {10, 40, 70, 130, 240, 723, 32, 64, 128, 256, 512, 1024};
  for (int i = 0; i < (sizeof(blockSizes) / sizeof(blockSizes[0])); ++i)
    test_syncthreads_count(blockSizes[i]);
  passed();
}