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#include <unittest/unittest.h>
#include <thrust/extrema.h>
#include <thrust/execution_policy.h>
template<typename ExecutionPolicy, typename Iterator, typename Iterator2>
__global__
void max_element_kernel(ExecutionPolicy exec, Iterator first, Iterator last, Iterator2 result)
{
*result = thrust::max_element(exec, first, last);
}
template<typename ExecutionPolicy, typename Iterator, typename BinaryPredicate, typename Iterator2>
__global__
void max_element_kernel(ExecutionPolicy exec, Iterator first, Iterator last, BinaryPredicate pred, Iterator2 result)
{
*result = thrust::max_element(exec, first, last, pred);
}
template<typename ExecutionPolicy>
void TestMaxElementDevice(ExecutionPolicy exec)
{
size_t n = 1000;
thrust::host_vector<int> h_data = unittest::random_samples<int>(n);
thrust::device_vector<int> d_data = h_data;
typedef typename thrust::device_vector<int>::iterator iter_type;
thrust::device_vector<iter_type> d_result(1);
typename thrust::host_vector<int>::iterator h_max = thrust::max_element(h_data.begin(), h_data.end());
max_element_kernel<<<1,1>>>(exec, d_data.begin(), d_data.end(), d_result.begin());
{
cudaError_t const err = cudaDeviceSynchronize();
ASSERT_EQUAL(cudaSuccess, err);
}
ASSERT_EQUAL(h_max - h_data.begin(), (iter_type)d_result[0] - d_data.begin());
typename thrust::host_vector<int>::iterator h_min = thrust::max_element(h_data.begin(), h_data.end(), thrust::greater<int>());
max_element_kernel<<<1,1>>>(exec, d_data.begin(), d_data.end(), thrust::greater<int>(), d_result.begin());
{
cudaError_t const err = cudaDeviceSynchronize();
ASSERT_EQUAL(cudaSuccess, err);
}
ASSERT_EQUAL(h_min - h_data.begin(), (iter_type)d_result[0] - d_data.begin());
}
void TestMaxElementDeviceSeq()
{
TestMaxElementDevice(thrust::seq);
}
DECLARE_UNITTEST(TestMaxElementDeviceSeq);
void TestMaxElementDeviceDevice()
{
TestMaxElementDevice(thrust::device);
}
DECLARE_UNITTEST(TestMaxElementDeviceDevice);
void TestMaxElementDeviceNoSync()
{
TestMaxElementDevice(thrust::cuda::par_nosync);
}
DECLARE_UNITTEST(TestMaxElementDeviceNoSync);
template<typename ExecutionPolicy>
void TestMaxElementCudaStreams(ExecutionPolicy policy)
{
typedef thrust::device_vector<int> Vector;
typedef Vector::value_type T;
Vector data(6);
data[0] = 3;
data[1] = 5;
data[2] = 1;
data[3] = 2;
data[4] = 5;
data[5] = 1;
cudaStream_t s;
cudaStreamCreate(&s);
auto streampolicy = policy.on(s);
ASSERT_EQUAL( *thrust::max_element(streampolicy, data.begin(), data.end()), 5);
ASSERT_EQUAL( thrust::max_element(streampolicy, data.begin(), data.end()) - data.begin(), 1);
ASSERT_EQUAL( *thrust::max_element(streampolicy, data.begin(), data.end(), thrust::greater<T>()), 1);
ASSERT_EQUAL( thrust::max_element(streampolicy, data.begin(), data.end(), thrust::greater<T>()) - data.begin(), 2);
cudaStreamDestroy(s);
}
void TestMaxElementCudaStreamsSync(){
TestMaxElementCudaStreams(thrust::cuda::par);
}
DECLARE_UNITTEST(TestMaxElementCudaStreamsSync);
void TestMaxElementCudaStreamsNoSync(){
TestMaxElementCudaStreams(thrust::cuda::par_nosync);
}
DECLARE_UNITTEST(TestMaxElementCudaStreamsNoSync);
void TestMaxElementDevicePointer()
{
typedef thrust::device_vector<int> Vector;
typedef Vector::value_type T;
Vector data(6);
data[0] = 3;
data[1] = 5;
data[2] = 1;
data[3] = 2;
data[4] = 5;
data[5] = 1;
T* raw_ptr = thrust::raw_pointer_cast(data.data());
size_t n = data.size();
ASSERT_EQUAL( thrust::max_element(thrust::device, raw_ptr, raw_ptr+n) - raw_ptr, 1);
ASSERT_EQUAL( thrust::max_element(thrust::device, raw_ptr, raw_ptr+n, thrust::greater<T>()) - raw_ptr, 2);
}
DECLARE_UNITTEST(TestMaxElementDevicePointer);
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