| /************************************************************************************\ |
| * * |
| * Copyright � 2014 Advanced Micro Devices, Inc. * |
| * Copyright (c) 2015 Mark D. Hill and David A. Wood * |
| * Copyright (c) 2021 Gaurav Jain and Matthew D. Sinclair * |
| * All rights reserved. * |
| * * |
| * Redistribution and use in source and binary forms, with or without * |
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| \************************************************************************************/ |
| |
| #ifndef KERNEL_H |
| #define KERNEL_H |
| |
| #include "hip/hip_runtime.h" |
| |
| /** |
| * @brief pagerank 1 |
| * @param row csr pointer array |
| * @param col csr column array |
| * @param data weight array |
| * @param page_rank1 pagerank array 1 |
| * @param page_rank2 pagerank array 2 |
| * @param num_nodes number of vertices |
| * @param num_edges number of edges |
| */ |
| __global__ void |
| pagerank1(int *row, int *col, int *data, float *page_rank1, float *page_rank2, |
| const int num_nodes, const int num_edges) |
| { |
| // Get my workitem id |
| int tid = hipBlockDim_x * hipBlockIdx_x + hipThreadIdx_x; |
| |
| if (tid < num_nodes) { |
| // Get the starting and ending pointers of the neighborlist |
| int start = row[tid]; |
| int end; |
| if (tid + 1 < num_nodes) { |
| end = row[tid + 1]; |
| } else { |
| end = num_edges; |
| } |
| |
| int nid; |
| // Navigate the neighbor list |
| for (int edge = start; edge < end; edge++) { |
| nid = col[edge]; |
| // Transfer the PageRank value to neighbors |
| atomicAdd(&page_rank2[nid], page_rank1[tid] / (float)(end - start)); |
| } |
| } |
| } |
| |
| /** |
| * @brief pagerank 2 |
| * @param row csr pointer array |
| * @param col csr column array |
| * @param data weight array |
| * @param page_rank1 pagerank array 1 |
| * @param page_rank2 pagerank array 2 |
| * @param num_nodes number of vertices |
| * @param num_edges number of edges |
| */ |
| __global__ void |
| pagerank2(int *row, int *col, int *data, float *page_rank1, float *page_rank2, |
| const int num_nodes, const int num_edges) |
| { |
| // Get my workitem id |
| int tid = hipBlockDim_x * hipBlockIdx_x + hipThreadIdx_x; |
| |
| // Update pagerank value with the damping factor |
| if (tid < num_nodes) { |
| page_rank1[tid] = 0.15 / (float)num_nodes + 0.85 * page_rank2[tid]; |
| page_rank2[tid] = 0.0f; |
| } |
| } |
| |
| /** |
| * @brief inibuffer |
| * @param row csr pointer array |
| * @param page_rank1 pagerank array 1 |
| * @param page_rank2 pagerank array 2 |
| * @param num_nodes number of vertices |
| */ |
| __global__ void |
| inibuffer(int *row, float *page_rank1, float *page_rank2, const int num_nodes, |
| const int num_edges) |
| { |
| // Get my thread id |
| int tid = hipBlockDim_x * hipBlockIdx_x + hipThreadIdx_x; |
| |
| if (tid < num_nodes) { |
| page_rank1[tid] = 1 / (float)num_nodes; |
| page_rank2[tid] = 0.0f; |
| } |
| } |
| |
| #endif // KERNEL_H |