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GpuResources_c.h
/**
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD+Patents license found in the
* LICENSE file in the root directory of this source tree.
*/
// Copyright 2004-present Facebook. All Rights Reserved.
// -*- c -*-
#ifndef FAISS_GPU_RESOURCES_C_H
#define FAISS_GPU_RESOURCES_C_H
#include <cuda_runtime_api.h>
#include <cublas.h>
#include "faiss_c.h"
#ifdef __cplusplus
extern "C" {
#endif
/// Base class of GPU-side resource provider; hides provision of
/// cuBLAS handles, CUDA streams and a temporary memory manager
FAISS_DECLARE_CLASS(GpuResources)
FAISS_DECLARE_DESTRUCTOR(GpuResources)
/// Call to pre-allocate resources for a particular device. If this is
/// not called, then resources will be allocated at the first time
/// of demand
int faiss_GpuResources_initializeForDevice(FaissGpuResources*, int);
/// Returns the cuBLAS handle that we use for the given device
int faiss_GpuResources_getBlasHandle(FaissGpuResources*, int, cublasHandle_t*);
/// Returns the stream that we order all computation on for the
/// given device
int faiss_GpuResources_getDefaultStream(FaissGpuResources*, int, cudaStream_t*);
/// Returns the available CPU pinned memory buffer
int faiss_GpuResources_getPinnedMemory(FaissGpuResources*, void**, size_t*);
/// Returns the stream on which we perform async CPU <-> GPU copies
int faiss_GpuResources_getAsyncCopyStream(FaissGpuResources*, int, cudaStream_t*);
/// Calls getBlasHandle with the current device
int faiss_GpuResources_getBlasHandleCurrentDevice(FaissGpuResources*, cublasHandle_t*);
/// Calls getDefaultStream with the current device
int faiss_GpuResources_getDefaultStreamCurrentDevice(FaissGpuResources*, cudaStream_t*);
/// Synchronizes the CPU with respect to the default stream for the
/// given device
// equivalent to cudaDeviceSynchronize(getDefaultStream(device))
int faiss_GpuResources_syncDefaultStream(FaissGpuResources*, int);
/// Calls syncDefaultStream for the current device
int faiss_GpuResources_syncDefaultStreamCurrentDevice(FaissGpuResources*);
/// Calls getAsyncCopyStream for the current device
int faiss_GpuResources_getAsyncCopyStreamCurrentDevice(FaissGpuResources*, cudaStream_t*);
#ifdef __cplusplus
}
#endif
#endif