mirror of
https://github.com/NVIDIA/cuda-samples.git
synced 2024-11-24 15:59:15 +08:00
update sample conjugateGradientMultiDeviceCG to remove use of deprecated function cudaLaunchCooperativeKernelMultiDevice()
This commit is contained in:
Rutwik Choughule
parent
ba04faaf73
commit
3342d604fe
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@ -27,8 +27,7 @@
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/*
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* This sample implements a conjugate gradient solver on multiple GPU using
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* Multi Device Cooperative Groups, also uses Unified Memory optimized using
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* prefetching and usage hints.
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* Unified Memory optimized prefetching and usage hints.
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*
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*/
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@ -62,8 +61,8 @@ __device__ double grid_dot_result = 0.0;
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/* genTridiag: generate a random tridiagonal symmetric matrix */
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void genTridiag(int *I, int *J, float *val, int N, int nz) {
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I[0] = 0, J[0] = 0, J[1] = 1;
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val[0] = static_cast<float>(rand()) / RAND_MAX + 10.0f;
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val[1] = static_cast<float>(rand()) / RAND_MAX;
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val[0] = (float)rand() / RAND_MAX + 10.0f;
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val[1] = (float)rand() / RAND_MAX;
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int start;
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for (int i = 1; i < N; i++) {
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@ -82,10 +81,10 @@ void genTridiag(int *I, int *J, float *val, int N, int nz) {
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}
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val[start] = val[start - 1];
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val[start + 1] = static_cast<float>(rand()) / RAND_MAX + 10.0f;
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val[start + 1] = (float)rand() / RAND_MAX + 10.0f;
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if (i < N - 1) {
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val[start + 2] = static_cast<float>(rand()) / RAND_MAX;
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val[start + 2] = (float)rand() / RAND_MAX;
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}
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}
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@ -112,8 +111,8 @@ void cpuSpMV(int *I, int *J, float *val, int nnz, int num_rows, float alpha,
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return;
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}
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double dotProduct(float *vecA, float *vecB, int size) {
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double result = 0.0;
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float dotProduct(float *vecA, float *vecB, int size) {
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float result = 0.0;
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for (int i = 0; i < size; i++) {
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result = result + (vecA[i] * vecB[i]);
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@ -176,11 +175,90 @@ void cpuConjugateGrad(int *I, int *J, float *val, float *x, float *Ax, float *p,
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}
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}
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// Data filled on CPU needed for MultiGPU operations.
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struct MultiDeviceData {
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unsigned char *hostMemoryArrivedList;
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unsigned int numDevices;
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unsigned int deviceRank;
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};
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// Class used for coordination of multiple devices.
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class PeerGroup {
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const MultiDeviceData &data;
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const cg::grid_group &grid;
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__device__ unsigned char load_arrived(unsigned char *arrived) const {
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#if __CUDA_ARCH__ < 700
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return *(volatile unsigned char *)arrived;
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#else
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unsigned int result;
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asm volatile("ld.acquire.sys.global.u8 %0, [%1];"
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: "=r"(result)
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: "l"(arrived)
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: "memory");
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return result;
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#endif
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}
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__device__ void store_arrived(unsigned char *arrived,
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unsigned char val) const {
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#if __CUDA_ARCH__ < 700
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*(volatile unsigned char *)arrived = val;
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#else
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unsigned int reg_val = val;
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asm volatile(
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"st.release.sys.global.u8 [%1], %0;" ::"r"(reg_val) "l"(arrived)
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: "memory");
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// Avoids compiler warnings from unused variable val.
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(void)(reg_val = reg_val);
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#endif
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}
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public:
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__device__ PeerGroup(const MultiDeviceData &data, const cg::grid_group &grid)
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: data(data), grid(grid){};
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__device__ unsigned int size() const { return data.numDevices * grid.size(); }
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__device__ unsigned int thread_rank() const {
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return data.deviceRank * grid.size() + grid.thread_rank();
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}
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__device__ void sync() const {
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grid.sync();
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// One thread from each grid participates in the sync.
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if (grid.thread_rank() == 0) {
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if (data.deviceRank == 0) {
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// Leader grid waits for others to join and then releases them.
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// Other GPUs can arrive in any order, so the leader have to wait for
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// all others.
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for (int i = 0; i < data.numDevices - 1; i++) {
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while (load_arrived(&data.hostMemoryArrivedList[i]) == 0)
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;
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}
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for (int i = 0; i < data.numDevices - 1; i++) {
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store_arrived(&data.hostMemoryArrivedList[i], 0);
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}
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__threadfence_system();
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} else {
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// Other grids note their arrival and wait to be released.
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store_arrived(&data.hostMemoryArrivedList[data.deviceRank - 1], 1);
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while (load_arrived(&data.hostMemoryArrivedList[data.deviceRank - 1]) ==
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1)
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;
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}
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}
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grid.sync();
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}
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};
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__device__ void gpuSpMV(int *I, int *J, float *val, int nnz, int num_rows,
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float alpha, float *inputVecX, float *outputVecY,
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cg::thread_block &cta,
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const cg::multi_grid_group &multi_grid) {
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for (int i = multi_grid.thread_rank(); i < num_rows; i += multi_grid.size()) {
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const PeerGroup &peer_group) {
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for (int i = peer_group.thread_rank(); i < num_rows; i += peer_group.size()) {
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int row_elem = I[i];
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int next_row_elem = I[i + 1];
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int num_elems_this_row = next_row_elem - row_elem;
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@ -195,21 +273,21 @@ __device__ void gpuSpMV(int *I, int *J, float *val, int nnz, int num_rows,
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}
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__device__ void gpuSaxpy(float *x, float *y, float a, int size,
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const cg::multi_grid_group &multi_grid) {
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for (int i = multi_grid.thread_rank(); i < size; i += multi_grid.size()) {
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const PeerGroup &peer_group) {
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for (int i = peer_group.thread_rank(); i < size; i += peer_group.size()) {
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y[i] = a * x[i] + y[i];
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}
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}
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__device__ void gpuDotProduct(float *vecA, float *vecB, int size,
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const cg::thread_block &cta,
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const cg::multi_grid_group &multi_grid) {
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const PeerGroup &peer_group) {
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extern __shared__ double tmp[];
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double temp_sum = 0.0;
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for (int i = multi_grid.thread_rank(); i < size; i += multi_grid.size()) {
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temp_sum += static_cast<double>(vecA[i] * vecB[i]);
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for (int i = peer_group.thread_rank(); i < size; i += peer_group.size()) {
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temp_sum += (double)(vecA[i] * vecB[i]);
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}
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cg::thread_block_tile<32> tile32 = cg::tiled_partition<32>(cta);
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@ -235,26 +313,26 @@ __device__ void gpuDotProduct(float *vecA, float *vecB, int size,
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}
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__device__ void gpuCopyVector(float *srcA, float *destB, int size,
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const cg::multi_grid_group &multi_grid) {
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for (int i = multi_grid.thread_rank(); i < size; i += multi_grid.size()) {
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const PeerGroup &peer_group) {
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for (int i = peer_group.thread_rank(); i < size; i += peer_group.size()) {
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destB[i] = srcA[i];
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}
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}
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__device__ void gpuScaleVectorAndSaxpy(float *x, float *y, float a, float scale,
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int size,
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const cg::multi_grid_group &multi_grid) {
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for (int i = multi_grid.thread_rank(); i < size; i += multi_grid.size()) {
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int size, const PeerGroup &peer_group) {
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for (int i = peer_group.thread_rank(); i < size; i += peer_group.size()) {
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y[i] = a * x[i] + scale * y[i];
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}
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}
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extern "C" __global__ void multiGpuConjugateGradient(
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int *I, int *J, float *val, float *x, float *Ax, float *p, float *r,
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double *dot_result, int nnz, int N, float tol) {
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double *dot_result, int nnz, int N, float tol,
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MultiDeviceData multi_device_data) {
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cg::thread_block cta = cg::this_thread_block();
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cg::grid_group grid = cg::this_grid();
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cg::multi_grid_group multi_grid = cg::this_multi_grid();
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PeerGroup peer_group(multi_device_data, grid);
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const int max_iter = 10000;
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@ -262,22 +340,22 @@ extern "C" __global__ void multiGpuConjugateGradient(
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float alpham1 = -1.0;
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float r0 = 0.0, r1, b, a, na;
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for (int i = multi_grid.thread_rank(); i < N; i += multi_grid.size()) {
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for (int i = peer_group.thread_rank(); i < N; i += peer_group.size()) {
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r[i] = 1.0;
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x[i] = 0.0;
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}
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cg::sync(grid);
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gpuSpMV(I, J, val, nnz, N, alpha, x, Ax, cta, multi_grid);
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gpuSpMV(I, J, val, nnz, N, alpha, x, Ax, peer_group);
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cg::sync(grid);
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gpuSaxpy(Ax, r, alpham1, N, multi_grid);
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gpuSaxpy(Ax, r, alpham1, N, peer_group);
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cg::sync(grid);
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gpuDotProduct(r, r, N, cta, multi_grid);
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gpuDotProduct(r, r, N, cta, peer_group);
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cg::sync(grid);
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@ -285,7 +363,7 @@ extern "C" __global__ void multiGpuConjugateGradient(
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atomicAdd_system(dot_result, grid_dot_result);
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grid_dot_result = 0.0;
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}
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cg::sync(multi_grid);
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peer_group.sync();
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r1 = *dot_result;
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@ -293,21 +371,21 @@ extern "C" __global__ void multiGpuConjugateGradient(
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while (r1 > tol * tol && k <= max_iter) {
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if (k > 1) {
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b = r1 / r0;
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gpuScaleVectorAndSaxpy(r, p, alpha, b, N, multi_grid);
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gpuScaleVectorAndSaxpy(r, p, alpha, b, N, peer_group);
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} else {
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gpuCopyVector(r, p, N, multi_grid);
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gpuCopyVector(r, p, N, peer_group);
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}
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cg::sync(multi_grid);
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peer_group.sync();
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gpuSpMV(I, J, val, nnz, N, alpha, p, Ax, cta, multi_grid);
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gpuSpMV(I, J, val, nnz, N, alpha, p, Ax, peer_group);
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if (multi_grid.thread_rank() == 0) {
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if (peer_group.thread_rank() == 0) {
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*dot_result = 0.0;
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}
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cg::sync(multi_grid);
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peer_group.sync();
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gpuDotProduct(p, Ax, N, cta, multi_grid);
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gpuDotProduct(p, Ax, N, cta, peer_group);
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cg::sync(grid);
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@ -315,26 +393,27 @@ extern "C" __global__ void multiGpuConjugateGradient(
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atomicAdd_system(dot_result, grid_dot_result);
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grid_dot_result = 0.0;
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}
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cg::sync(multi_grid);
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peer_group.sync();
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a = r1 / *dot_result;
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gpuSaxpy(p, x, a, N, multi_grid);
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gpuSaxpy(p, x, a, N, peer_group);
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na = -a;
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gpuSaxpy(Ax, r, na, N, multi_grid);
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gpuSaxpy(Ax, r, na, N, peer_group);
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r0 = r1;
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cg::sync(multi_grid);
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if (multi_grid.thread_rank() == 0) {
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peer_group.sync();
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if (peer_group.thread_rank() == 0) {
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*dot_result = 0.0;
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}
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cg::sync(multi_grid);
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peer_group.sync();
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gpuDotProduct(r, r, N, cta, multi_grid);
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gpuDotProduct(r, r, N, cta, peer_group);
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cg::sync(grid);
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@ -342,7 +421,7 @@ extern "C" __global__ void multiGpuConjugateGradient(
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atomicAdd_system(dot_result, grid_dot_result);
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grid_dot_result = 0.0;
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}
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cg::sync(multi_grid);
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peer_group.sync();
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r1 = *dot_result;
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k++;
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@ -361,8 +440,7 @@ std::multimap<std::pair<int, int>, int> getIdenticalGPUs() {
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checkCudaErrors(cudaGetDeviceProperties(&deviceProp, i));
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// Filter unsupported devices
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if (deviceProp.cooperativeMultiDeviceLaunch &&
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deviceProp.concurrentManagedAccess) {
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if (deviceProp.cooperativeLaunch && deviceProp.concurrentManagedAccess) {
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identicalGpus.emplace(std::make_pair(deviceProp.major, deviceProp.minor),
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i);
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}
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@ -406,38 +484,39 @@ int main(int argc, char **argv) {
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if (distance(bestFit) < kNumGpusRequired) {
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printf(
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"No Two or more GPUs with same architecture capable of "
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"cooperativeMultiDeviceLaunch & concurrentManagedAccess found. "
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"No two or more GPUs with same architecture capable of "
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"concurrentManagedAccess found. "
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"\nWaiving the sample\n");
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exit(EXIT_WAIVED);
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}
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std::set<int> bestFitDeviceIds;
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// check & select peer-to-peer access capable GPU devices as enabling p2p
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// access between participating
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// GPUs gives better performance for multi_grid sync.
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// Check & select peer-to-peer access capable GPU devices as enabling p2p
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// access between participating GPUs gives better performance.
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for (auto itr = bestFit.first; itr != bestFit.second; itr++) {
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int deviceId = itr->second;
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checkCudaErrors(cudaSetDevice(deviceId));
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std::for_each(itr, bestFit.second, [&deviceId, &bestFitDeviceIds,
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&kNumGpusRequired](
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decltype(*itr) mapPair) {
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if (deviceId != mapPair.second) {
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int access = 0;
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checkCudaErrors(
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cudaDeviceCanAccessPeer(&access, deviceId, mapPair.second));
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printf("Device=%d %s Access Peer Device=%d\n", deviceId,
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access ? "CAN" : "CANNOT", mapPair.second);
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if (access && bestFitDeviceIds.size() < kNumGpusRequired) {
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bestFitDeviceIds.emplace(deviceId);
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bestFitDeviceIds.emplace(mapPair.second);
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} else {
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printf("Ignoring device %i (max devices exceeded)\n", mapPair.second);
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}
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}
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});
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std::for_each(
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itr, bestFit.second,
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[&deviceId, &bestFitDeviceIds,
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&kNumGpusRequired](decltype(*itr) mapPair) {
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if (deviceId != mapPair.second) {
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int access = 0;
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checkCudaErrors(
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cudaDeviceCanAccessPeer(&access, deviceId, mapPair.second));
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printf("Device=%d %s Access Peer Device=%d\n", deviceId,
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access ? "CAN" : "CANNOT", mapPair.second);
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if (access && bestFitDeviceIds.size() < kNumGpusRequired) {
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bestFitDeviceIds.emplace(deviceId);
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bestFitDeviceIds.emplace(mapPair.second);
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} else {
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printf("Ignoring device %i (max devices exceeded)\n",
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mapPair.second);
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}
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}
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});
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if (bestFitDeviceIds.size() >= kNumGpusRequired) {
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printf("Selected p2p capable devices - ");
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@ -451,8 +530,7 @@ int main(int argc, char **argv) {
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}
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// if bestFitDeviceIds.size() == 0 it means the GPUs in system are not p2p
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// capable,
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// hence we add it without p2p capability check.
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// capable, hence we add it without p2p capability check.
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if (!bestFitDeviceIds.size()) {
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printf("Devices involved are not p2p capable.. selecting %zu of them\n",
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kNumGpusRequired);
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@ -469,8 +547,7 @@ int main(int argc, char **argv) {
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});
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} else {
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// perform cudaDeviceEnablePeerAccess in both directions for all
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// participating devices of a cudaLaunchCooperativeKernelMultiDevice call
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// this gives better performance for multi_grid sync.
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// participating devices.
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for (auto p1_itr = bestFitDeviceIds.begin();
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p1_itr != bestFitDeviceIds.end(); p1_itr++) {
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checkCudaErrors(cudaSetDevice(*p1_itr));
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@ -488,14 +565,11 @@ int main(int argc, char **argv) {
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N = 10485760 * 2;
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nz = (N - 2) * 3 + 4;
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checkCudaErrors(
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cudaMallocManaged(reinterpret_cast<void **>(&I), sizeof(int) * (N + 1)));
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checkCudaErrors(
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cudaMallocManaged(reinterpret_cast<void **>(&J), sizeof(int) * nz));
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checkCudaErrors(
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cudaMallocManaged(reinterpret_cast<void **>(&val), sizeof(float) * nz));
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checkCudaErrors(cudaMallocManaged((void **)&I, sizeof(int) * (N + 1)));
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checkCudaErrors(cudaMallocManaged((void **)&J, sizeof(int) * nz));
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checkCudaErrors(cudaMallocManaged((void **)&val, sizeof(float) * nz));
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float *val_cpu = reinterpret_cast<float *>(malloc(sizeof(float) * nz));
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float *val_cpu = (float *)malloc(sizeof(float) * nz);
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genTridiag(I, J, val_cpu, N, nz);
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@ -507,22 +581,17 @@ int main(int argc, char **argv) {
|
|||
checkCudaErrors(
|
||||
cudaMemAdvise(val, sizeof(float) * nz, cudaMemAdviseSetReadMostly, 0));
|
||||
|
||||
checkCudaErrors(
|
||||
cudaMallocManaged(reinterpret_cast<void **>(&x), sizeof(float) * N));
|
||||
checkCudaErrors(cudaMallocManaged((void **)&x, sizeof(float) * N));
|
||||
|
||||
double *dot_result;
|
||||
checkCudaErrors(cudaMallocManaged(reinterpret_cast<void **>(&dot_result),
|
||||
sizeof(double)));
|
||||
checkCudaErrors(cudaMallocManaged((void **)&dot_result, sizeof(double)));
|
||||
|
||||
checkCudaErrors(cudaMemset(dot_result, 0.0, sizeof(double)));
|
||||
checkCudaErrors(cudaMemset(dot_result, 0, sizeof(double)));
|
||||
|
||||
// temp memory for ConjugateGradient
|
||||
checkCudaErrors(
|
||||
cudaMallocManaged(reinterpret_cast<void **>(&r), N * sizeof(float)));
|
||||
checkCudaErrors(
|
||||
cudaMallocManaged(reinterpret_cast<void **>(&p), N * sizeof(float)));
|
||||
checkCudaErrors(
|
||||
cudaMallocManaged(reinterpret_cast<void **>(&Ax), N * sizeof(float)));
|
||||
checkCudaErrors(cudaMallocManaged((void **)&r, N * sizeof(float)));
|
||||
checkCudaErrors(cudaMallocManaged((void **)&p, N * sizeof(float)));
|
||||
checkCudaErrors(cudaMallocManaged((void **)&Ax, N * sizeof(float)));
|
||||
|
||||
std::cout << "\nRunning on GPUs = " << kNumGpusRequired << std::endl;
|
||||
cudaStream_t nStreams[kNumGpusRequired];
|
||||
|
|
@ -616,10 +685,10 @@ int main(int argc, char **argv) {
|
|||
}
|
||||
|
||||
#if ENABLE_CPU_DEBUG_CODE
|
||||
float *Ax_cpu = reinterpret_cast<float *>(malloc(sizeof(float) * N));
|
||||
float *r_cpu = reinterpret_cast<float *>(malloc(sizeof(float) * N));
|
||||
float *p_cpu = reinterpret_cast<float *>(malloc(sizeof(float) * N));
|
||||
float *x_cpu = reinterpret_cast<float *>(malloc(sizeof(float) * N));
|
||||
float *Ax_cpu = (float *)malloc(sizeof(float) * N);
|
||||
float *r_cpu = (float *)malloc(sizeof(float) * N);
|
||||
float *p_cpu = (float *)malloc(sizeof(float) * N);
|
||||
float *x_cpu = (float *)malloc(sizeof(float) * N);
|
||||
|
||||
for (int i = 0; i < N; i++) {
|
||||
r_cpu[i] = 1.0;
|
||||
|
|
@ -631,28 +700,37 @@ int main(int argc, char **argv) {
|
|||
numSms * numBlocksPerSm * THREADS_PER_BLOCK, numBlocksPerSm);
|
||||
dim3 dimGrid(numSms * numBlocksPerSm, 1, 1),
|
||||
dimBlock(THREADS_PER_BLOCK, 1, 1);
|
||||
|
||||
// Structure used for cross-grid synchronization.
|
||||
MultiDeviceData multi_device_data;
|
||||
checkCudaErrors(cudaHostAlloc(
|
||||
&multi_device_data.hostMemoryArrivedList,
|
||||
(kNumGpusRequired - 1) * sizeof(*multi_device_data.hostMemoryArrivedList),
|
||||
cudaHostAllocPortable));
|
||||
memset(multi_device_data.hostMemoryArrivedList, 0,
|
||||
(kNumGpusRequired - 1) *
|
||||
sizeof(*multi_device_data.hostMemoryArrivedList));
|
||||
multi_device_data.numDevices = kNumGpusRequired;
|
||||
multi_device_data.deviceRank = 0;
|
||||
|
||||
void *kernelArgs[] = {
|
||||
(void *)&I, (void *)&J, (void *)&val, (void *)&x,
|
||||
(void *)&Ax, (void *)&p, (void *)&r, (void *)&dot_result,
|
||||
(void *)&nz, (void *)&N, (void *)&tol,
|
||||
(void *)&nz, (void *)&N, (void *)&tol, (void *)&multi_device_data,
|
||||
};
|
||||
cudaLaunchParams *launchParamsList =
|
||||
(cudaLaunchParams *)malloc(sizeof(cudaLaunchParams) * kNumGpusRequired);
|
||||
for (int i = 0; i < kNumGpusRequired; i++) {
|
||||
launchParamsList[i].func = (void *)multiGpuConjugateGradient;
|
||||
launchParamsList[i].gridDim = dimGrid;
|
||||
launchParamsList[i].blockDim = dimBlock;
|
||||
launchParamsList[i].sharedMem = sMemSize;
|
||||
launchParamsList[i].stream = nStreams[i];
|
||||
launchParamsList[i].args = kernelArgs;
|
||||
}
|
||||
|
||||
printf("Launching kernel\n");
|
||||
|
||||
checkCudaErrors(cudaLaunchCooperativeKernelMultiDevice(
|
||||
launchParamsList, kNumGpusRequired,
|
||||
cudaCooperativeLaunchMultiDeviceNoPreSync |
|
||||
cudaCooperativeLaunchMultiDeviceNoPostSync));
|
||||
deviceId = bestFitDeviceIds.begin();
|
||||
device_count = 0;
|
||||
while (deviceId != bestFitDeviceIds.end()) {
|
||||
checkCudaErrors(cudaSetDevice(*deviceId));
|
||||
checkCudaErrors(cudaLaunchCooperativeKernel(
|
||||
(void *)multiGpuConjugateGradient, dimGrid, dimBlock, kernelArgs,
|
||||
sMemSize, nStreams[device_count++]));
|
||||
multi_device_data.deviceRank++;
|
||||
deviceId++;
|
||||
}
|
||||
|
||||
checkCudaErrors(cudaMemPrefetchAsync(x, sizeof(float) * N, cudaCpuDeviceId));
|
||||
checkCudaErrors(
|
||||
|
|
@ -690,6 +768,7 @@ int main(int argc, char **argv) {
|
|||
}
|
||||
}
|
||||
|
||||
checkCudaErrors(cudaFreeHost(multi_device_data.hostMemoryArrivedList));
|
||||
checkCudaErrors(cudaFree(I));
|
||||
checkCudaErrors(cudaFree(J));
|
||||
checkCudaErrors(cudaFree(val));
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user