/****************************************************************************** * Copyright (c) 2011, Duane Merrill. All rights reserved. * Copyright (c) 2011-2018, NVIDIA CORPORATION. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * Neither the name of the NVIDIA CORPORATION nor the * names of its contributors may be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL NVIDIA CORPORATION BE LIABLE FOR ANY * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * ******************************************************************************/ /****************************************************************************** * Simple example of DeviceSelect::Flagged(). * * Selects flagged items from from a sequence of int keys using a * corresponding sequence of unsigned char flags. * * To compile using the command line: * nvcc -arch=sm_XX example_device_select_flagged.cu -I../.. -lcudart -O3 * ******************************************************************************/ // Ensure printing of CUDA runtime errors to console #define CUB_STDERR #include #include #include #include "../../test/test_util.h" using namespace cub; //--------------------------------------------------------------------- // Globals, constants and typedefs //--------------------------------------------------------------------- bool g_verbose = false; // Whether to display input/output to console CachingDeviceAllocator g_allocator(true); // Caching allocator for device memory //--------------------------------------------------------------------- // Test generation //--------------------------------------------------------------------- /** * Initialize problem, setting flags at distances of random length * chosen from [1..max_segment] */ void Initialize( int *h_in, unsigned char *h_flags, int num_items, int max_segment) { unsigned short max_short = (unsigned short) -1; int key = 0; int i = 0; while (i < num_items) { // Select number of repeating occurrences unsigned short repeat; RandomBits(repeat); repeat = (unsigned short) ((float(repeat) * (float(max_segment) / float(max_short)))); repeat = CUB_MAX(1, repeat); int j = i; while (j < CUB_MIN(i + repeat, num_items)) { h_flags[j] = 0; h_in[j] = key; j++; } h_flags[i] = 1; i = j; key++; } if (g_verbose) { printf("Input:\n"); DisplayResults(h_in, num_items); printf("Flags:\n"); DisplayResults(h_flags, num_items); printf("\n\n"); } } /** * Solve unique problem */ int Solve( int *h_in, unsigned char *h_flags, int *h_reference, int num_items) { int num_selected = 0; for (int i = 0; i < num_items; ++i) { if (h_flags[i]) { h_reference[num_selected] = h_in[i]; num_selected++; } else { h_reference[num_items - (i - num_selected) - 1] = h_in[i]; } } return num_selected; } //--------------------------------------------------------------------- // Main //--------------------------------------------------------------------- /** * Main */ int main(int argc, char** argv) { int num_items = 150; int max_segment = 40; // Maximum segment length // Initialize command line CommandLineArgs args(argc, argv); g_verbose = args.CheckCmdLineFlag("v"); args.GetCmdLineArgument("n", num_items); args.GetCmdLineArgument("maxseg", max_segment); // Print usage if (args.CheckCmdLineFlag("help")) { printf("%s " "[--n= " "[--device=] " "[--maxseg=] " "[--v] " "\n", argv[0]); exit(0); } // Initialize device CubDebugExit(args.DeviceInit()); // Allocate host arrays int *h_in = new int[num_items]; int *h_reference = new int[num_items]; unsigned char *h_flags = new unsigned char[num_items]; // Initialize problem and solution Initialize(h_in, h_flags, num_items, max_segment); int num_selected = Solve(h_in, h_flags, h_reference, num_items); printf("cub::DeviceSelect::Flagged %d items, %d selected (avg distance %d), %d-byte elements\n", num_items, num_selected, (num_selected > 0) ? num_items / num_selected : 0, (int) sizeof(int)); fflush(stdout); // Allocate problem device arrays int *d_in = NULL; unsigned char *d_flags = NULL; CubDebugExit(g_allocator.DeviceAllocate((void**)&d_in, sizeof(int) * num_items)); CubDebugExit(g_allocator.DeviceAllocate((void**)&d_flags, sizeof(unsigned char) * num_items)); // Initialize device input CubDebugExit(cudaMemcpy(d_in, h_in, sizeof(int) * num_items, cudaMemcpyHostToDevice)); CubDebugExit(cudaMemcpy(d_flags, h_flags, sizeof(unsigned char) * num_items, cudaMemcpyHostToDevice)); // Allocate device output array and num selected int *d_out = NULL; int *d_num_selected_out = NULL; CubDebugExit(g_allocator.DeviceAllocate((void**)&d_out, sizeof(int) * num_items)); CubDebugExit(g_allocator.DeviceAllocate((void**)&d_num_selected_out, sizeof(int))); // Allocate temporary storage void *d_temp_storage = NULL; size_t temp_storage_bytes = 0; CubDebugExit(DeviceSelect::Flagged(d_temp_storage, temp_storage_bytes, d_in, d_flags, d_out, d_num_selected_out, num_items)); CubDebugExit(g_allocator.DeviceAllocate(&d_temp_storage, temp_storage_bytes)); // Run CubDebugExit(DeviceSelect::Flagged(d_temp_storage, temp_storage_bytes, d_in, d_flags, d_out, d_num_selected_out, num_items)); // Check for correctness (and display results, if specified) int compare = CompareDeviceResults(h_reference, d_out, num_selected, true, g_verbose); printf("\t Data %s ", compare ? "FAIL" : "PASS"); compare |= CompareDeviceResults(&num_selected, d_num_selected_out, 1, true, g_verbose); printf("\t Count %s ", compare ? "FAIL" : "PASS"); AssertEquals(0, compare); // Cleanup if (h_in) delete[] h_in; if (h_reference) delete[] h_reference; if (d_out) CubDebugExit(g_allocator.DeviceFree(d_out)); if (d_num_selected_out) CubDebugExit(g_allocator.DeviceFree(d_num_selected_out)); if (d_temp_storage) CubDebugExit(g_allocator.DeviceFree(d_temp_storage)); if (d_in) CubDebugExit(g_allocator.DeviceFree(d_in)); if (d_flags) CubDebugExit(g_allocator.DeviceFree(d_flags)); printf("\n\n"); return 0; }