145 lines
4.4 KiB
Plaintext
145 lines
4.4 KiB
Plaintext
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD+Patents license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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// Copyright 2004-present Facebook. All Rights Reserved.
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#include "../../IndexFlat.h"
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#include "../../utils.h"
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#include "../GpuIndexFlat.h"
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#include "IndexWrapper.h"
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#include "../test/TestUtils.h"
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#include "../utils/DeviceTensor.cuh"
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#include "../utils/DeviceUtils.h"
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#include "../utils/HostTensor.cuh"
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#include "../utils/Timer.h"
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#include <gflags/gflags.h>
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#include <map>
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#include <memory>
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#include <vector>
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#include <cuda_profiler_api.h>
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DEFINE_int32(k, 3, "final number of closest results returned");
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DEFINE_int32(num, 128, "# of vecs");
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DEFINE_int32(dim, 128, "# of dimensions");
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DEFINE_int32(num_queries, 3, "number of query vectors");
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DEFINE_bool(diff, true, "show exact distance + index output discrepancies");
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DEFINE_bool(use_float16, false, "use encodings in float16 instead of float32");
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DEFINE_bool(transposed, false, "store vectors transposed");
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DEFINE_int64(seed, -1, "specify random seed");
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DEFINE_int32(num_gpus, 1, "number of gpus to use");
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DEFINE_int64(pinned_mem, 0, "pinned memory allocation to use");
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using namespace faiss::gpu;
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int main(int argc, char** argv) {
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gflags::ParseCommandLineFlags(&argc, &argv, true);
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cudaProfilerStop();
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auto seed = FLAGS_seed != -1L ? FLAGS_seed : time(nullptr);
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printf("using seed %ld\n", seed);
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auto numQueries = FLAGS_num_queries;
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auto index = std::unique_ptr<faiss::IndexFlatL2>(
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new faiss::IndexFlatL2(FLAGS_dim));
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HostTensor<float, 2, true> vecs({FLAGS_num, FLAGS_dim});
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faiss::float_rand(vecs.data(), vecs.numElements(), seed);
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index->add(FLAGS_num, vecs.data());
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printf("Database: dim %d num vecs %d\n", FLAGS_dim, FLAGS_num);
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printf("L2 lookup: %d queries, total k %d\n",
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numQueries, FLAGS_k);
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printf("float16 encoding %s\n", FLAGS_use_float16 ? "enabled" : "disabled");
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printf("transposed storage %s\n", FLAGS_transposed ? "enabled" : "disabled");
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// Convert to GPU index
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printf("Copying index to %d GPU(s)...\n", FLAGS_num_gpus);
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auto initFn = [&index](faiss::gpu::GpuResources* res, int dev) ->
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std::unique_ptr<faiss::gpu::GpuIndexFlatL2> {
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((faiss::gpu::StandardGpuResources*) res)->setPinnedMemory(
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FLAGS_pinned_mem);
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GpuIndexFlatConfig config;
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config.device = dev;
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config.useFloat16 = FLAGS_use_float16;
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config.storeTransposed = FLAGS_transposed;
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auto p = std::unique_ptr<faiss::gpu::GpuIndexFlatL2>(
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new faiss::gpu::GpuIndexFlatL2(res, index.get(), config));
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return p;
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};
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IndexWrapper<faiss::gpu::GpuIndexFlatL2> gpuIndex(FLAGS_num_gpus, initFn);
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printf("copy done\n");
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// Build query vectors
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HostTensor<float, 2, true> cpuQuery({numQueries, FLAGS_dim});
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faiss::float_rand(cpuQuery.data(), cpuQuery.numElements(), seed);
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// Time faiss CPU
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HostTensor<float, 2, true> cpuDistances({numQueries, FLAGS_k});
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HostTensor<faiss::Index::idx_t, 2, true> cpuIndices({numQueries, FLAGS_k});
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float cpuTime = 0.0f;
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{
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CpuTimer timer;
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index->search(numQueries,
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cpuQuery.data(),
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FLAGS_k,
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cpuDistances.data(),
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cpuIndices.data());
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cpuTime = timer.elapsedMilliseconds();
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}
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printf("CPU time %.3f ms\n", cpuTime);
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HostTensor<float, 2, true> gpuDistances({numQueries, FLAGS_k});
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HostTensor<faiss::Index::idx_t, 2, true> gpuIndices({numQueries, FLAGS_k});
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CUDA_VERIFY(cudaProfilerStart());
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faiss::gpu::synchronizeAllDevices();
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float gpuTime = 0.0f;
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// Time GPU
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{
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CpuTimer timer;
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gpuIndex.getIndex()->search(cpuQuery.getSize(0),
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cpuQuery.data(),
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FLAGS_k,
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gpuDistances.data(),
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gpuIndices.data());
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// There is a device -> host copy above, so no need to time
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// additional synchronization with the GPU
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gpuTime = timer.elapsedMilliseconds();
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}
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CUDA_VERIFY(cudaProfilerStop());
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printf("GPU time %.3f ms\n", gpuTime);
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compareLists(cpuDistances.data(), cpuIndices.data(),
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gpuDistances.data(), gpuIndices.data(),
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numQueries, FLAGS_k,
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"", true, FLAGS_diff, false);
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CUDA_VERIFY(cudaDeviceSynchronize());
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// printf("\ncudaMalloc usage %zd\n",
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// resources.getMemoryManager().getHighWaterCudaMalloc());
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return 0;
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}
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