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//@HEADER
// ************************************************************************
//
// Kokkos v. 4.0
// Copyright (2022) National Technology & Engineering
// Solutions of Sandia, LLC (NTESS).
//
// Under the terms of Contract DE-NA0003525 with NTESS,
// the U.S. Government retains certain rights in this software.
//
// Part of Kokkos, under the Apache License v2.0 with LLVM Exceptions.
// See https://kokkos.org/LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//@HEADER
#include <TestCuda_Category.hpp>
#include <TestMultiGPU.hpp>
namespace {
struct StreamsAndDevices {
std::array<cudaStream_t, 2> streams;
std::array<int, 2> devices;
StreamsAndDevices() {
int n_devices;
KOKKOS_IMPL_CUDA_SAFE_CALL(cudaGetDeviceCount(&n_devices));
devices = {0, n_devices - 1};
for (int i = 0; i < 2; ++i) {
KOKKOS_IMPL_CUDA_SAFE_CALL(cudaSetDevice(devices[i]));
KOKKOS_IMPL_CUDA_SAFE_CALL(cudaStreamCreate(&streams[i]));
}
}
StreamsAndDevices(const StreamsAndDevices &) = delete;
StreamsAndDevices &operator=(const StreamsAndDevices &) = delete;
~StreamsAndDevices() {
for (int i = 0; i < 2; ++i) {
KOKKOS_IMPL_CUDA_SAFE_CALL(cudaSetDevice(devices[i]));
KOKKOS_IMPL_CUDA_SAFE_CALL(cudaStreamDestroy(streams[i]));
}
}
};
std::array<TEST_EXECSPACE, 2> get_execution_spaces(
const StreamsAndDevices &streams_and_devices) {
TEST_EXECSPACE exec0(streams_and_devices.streams[0]);
TEST_EXECSPACE exec1(streams_and_devices.streams[1]);
// Must return void to use ASSERT_EQ
[&]() {
ASSERT_EQ(exec0.cuda_device(), streams_and_devices.devices[0]);
ASSERT_EQ(exec1.cuda_device(), streams_and_devices.devices[1]);
}();
return {exec0, exec1};
}
struct TEST_CATEGORY_FIXTURE(multi_gpu) : public ::testing::Test {
StreamsAndDevices sd;
void SetUp() override {
if (sd.devices[0] == sd.devices[1])
GTEST_SKIP() << "Skipping Cuda multi-gpu testing since current machine "
"only contains a single GPU.\n";
}
};
TEST_F(TEST_CATEGORY_FIXTURE(multi_gpu), managed_views) {
StreamsAndDevices streams_and_devices;
{
std::array<TEST_EXECSPACE, 2> execs =
get_execution_spaces(streams_and_devices);
Kokkos::View<int *, TEST_EXECSPACE> view0(
Kokkos::view_alloc("v0", execs[0]), 100);
Kokkos::View<int *, TEST_EXECSPACE> view(Kokkos::view_alloc("v", execs[1]),
100);
test_policies(execs[0], view0, execs[1], view);
}
}
TEST_F(TEST_CATEGORY_FIXTURE(multi_gpu), unmanaged_views) {
StreamsAndDevices streams_and_devices;
{
std::array<TEST_EXECSPACE, 2> execs =
get_execution_spaces(streams_and_devices);
KOKKOS_IMPL_CUDA_SAFE_CALL(cudaSetDevice(execs[0].cuda_device()));
int *p0;
void *p0_void_ptr = nullptr;
KOKKOS_IMPL_CUDA_SAFE_CALL(cudaMalloc(&p0_void_ptr, sizeof(int) * 100));
p0 = static_cast<int *>(p0_void_ptr);
Kokkos::View<int *, TEST_EXECSPACE> view0(p0, 100);
KOKKOS_IMPL_CUDA_SAFE_CALL(cudaSetDevice(execs[1].cuda_device()));
int *p;
void *p_void_ptr = nullptr;
KOKKOS_IMPL_CUDA_SAFE_CALL(cudaMalloc(&p_void_ptr, sizeof(int) * 100));
p = static_cast<int *>(p_void_ptr);
Kokkos::View<int *, TEST_EXECSPACE> view(p, 100);
test_policies(execs[0], view0, execs[1], view);
KOKKOS_IMPL_CUDA_SAFE_CALL(cudaFree(p0));
KOKKOS_IMPL_CUDA_SAFE_CALL(cudaFree(p));
}
}
TEST_F(TEST_CATEGORY_FIXTURE(multi_gpu), scratch_space) {
StreamsAndDevices streams_and_devices;
{
std::array<TEST_EXECSPACE, 2> execs =
get_execution_spaces(streams_and_devices);
test_scratch(execs[0], execs[1]);
}
}
TEST_F(TEST_CATEGORY_FIXTURE(multi_gpu), stream_sync_semantics_raw_cuda) {
// Test that stream synchronization behavior for various GPU APIs matches the
// assumptions made in Kokkos for multi gpu support, namely, that any stream
// (no matter which device it is created on) can be synced from any device.
StreamsAndDevices streams_and_devices;
{
auto streams = streams_and_devices.streams;
auto devices = streams_and_devices.devices;
// Allocate data.
int *value;
void *value_void_ptr = nullptr;
KOKKOS_IMPL_CUDA_SAFE_CALL(
cudaMallocHost(&value_void_ptr, 1 * sizeof(int)));
value = static_cast<int *>(value_void_ptr);
int *check;
void *check_void_ptr = nullptr;
KOKKOS_IMPL_CUDA_SAFE_CALL(
cudaMallocHost(&check_void_ptr, 1 * sizeof(int)));
check = static_cast<int *>(check_void_ptr);
// Launch "long" kernel on device 0.
KOKKOS_IMPL_CUDA_SAFE_CALL(cudaSetDevice(devices[0]));
constexpr size_t size = 10000;
accumulate_kernel<size><<<1, 1, 0, streams[0]>>>(value);
// Wait for the kernel running on device 0 while we are on device 1, then
// check the value.
KOKKOS_IMPL_CUDA_SAFE_CALL(cudaSetDevice(devices[1]));
KOKKOS_IMPL_CUDA_SAFE_CALL(cudaStreamSynchronize(streams[0]));
copy_kernel<<<1, 1, 0, streams[1]>>>(check, value);
KOKKOS_IMPL_CUDA_SAFE_CALL(cudaStreamSynchronize(streams[1]));
ASSERT_EQ(check[0], size);
// Cleanup.
KOKKOS_IMPL_CUDA_SAFE_CALL(cudaFreeHost(value));
KOKKOS_IMPL_CUDA_SAFE_CALL(cudaFreeHost(check));
}
}
} // namespace
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