Sylvain Jeaugey
3c223c105a
Add network communication through another GPU connected with NVLink (PXN). Add aggregation of messages coming from different local GPUs through PXN and going to the same destination. Add new v5 plugin API with grouped receives and tags. Add compat for v4 plugins. Add naming of NCCL threads to help debugging. Fix NVLink detection and avoid data corruption when some NVLinks are down. Add support for Relaxed Ordering for IB. Add profiling and timing infrastructure.
221 строка
11 KiB
C
221 строка
11 KiB
C
/*************************************************************************
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* Copyright (c) 2017-2022, NVIDIA CORPORATION. All rights reserved.
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*
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* See LICENSE.txt for license information
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************************************************************************/
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#ifndef NCCL_NET_H_
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#define NCCL_NET_H_
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#include "nccl.h"
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#include <stdint.h>
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#define NCCL_NET_HANDLE_MAXSIZE 128
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#define NCCL_PTR_HOST 0x1
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#define NCCL_PTR_CUDA 0x2
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// Maximum number of requests per comm object
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#define NCCL_NET_MAX_REQUESTS 8
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typedef enum {NCCL_LOG_NONE=0, NCCL_LOG_VERSION=1, NCCL_LOG_WARN=2, NCCL_LOG_INFO=3, NCCL_LOG_ABORT=4, NCCL_LOG_TRACE=5} ncclDebugLogLevel;
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typedef enum {NCCL_INIT=1, NCCL_COLL=2, NCCL_P2P=4, NCCL_SHM=8, NCCL_NET=16, NCCL_GRAPH=32, NCCL_TUNING=64, NCCL_ENV=128, NCCL_ALLOC=256, NCCL_ALL=~0} ncclDebugLogSubSys;
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typedef void (*ncclDebugLogger_t)(ncclDebugLogLevel level, unsigned long flags, const char *file, int line, const char *fmt, ...);
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typedef struct {
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char* name; // Used mostly for logging.
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char* pciPath; // Path to the PCI device in /sys.
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uint64_t guid; // Unique identifier for the NIC chip. Important for
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// cards with multiple PCI functions (Physical or virtual).
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int ptrSupport; // NCCL_PTR_HOST or NCCL_PTR_HOST|NCCL_PTR_CUDA
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int speed; // Port speed in Mbps.
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int port; // Port number.
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float latency; // Network latency
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int maxComms; // Maximum number of comms we can create
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int maxRecvs; // Maximum number of grouped receives.
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}ncclNetProperties_v5_t;
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typedef ncclNetProperties_v5_t ncclNetProperties_t;
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typedef struct {
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// Name of the network (mainly for logs)
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const char* name;
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// Initialize the network.
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ncclResult_t (*init)(ncclDebugLogger_t logFunction);
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// Return the number of adapters.
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ncclResult_t (*devices)(int* ndev);
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// Get various device properties.
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ncclResult_t (*getProperties)(int dev, ncclNetProperties_v5_t* props);
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// Create a receiving object and provide a handle to connect to it. The
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// handle can be up to NCCL_NET_HANDLE_MAXSIZE bytes and will be exchanged
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// between ranks to create a connection.
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ncclResult_t (*listen)(int dev, void* handle, void** listenComm);
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// Connect to a handle and return a sending comm object for that peer.
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// This call must not block for the connection to be established, and instead
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// should return successfully with sendComm == NULL with the expectation that
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// it will be called again until sendComm != NULL.
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ncclResult_t (*connect)(int dev, void* handle, void** sendComm);
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// Finalize connection establishment after remote peer has called connect.
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// This call must not block for the connection to be established, and instead
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// should return successfully with recvComm == NULL with the expectation that
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// it will be called again until recvComm != NULL.
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ncclResult_t (*accept)(void* listenComm, void** recvComm);
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// Register/Deregister memory. Comm can be either a sendComm or a recvComm.
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// Type is either NCCL_PTR_HOST or NCCL_PTR_CUDA.
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ncclResult_t (*regMr)(void* comm, void* data, int size, int type, void** mhandle);
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ncclResult_t (*deregMr)(void* comm, void* mhandle);
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// Asynchronous send to a peer.
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// May return request == NULL if the call cannot be performed (or would block)
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ncclResult_t (*isend)(void* sendComm, void* data, int size, int tag, void* mhandle, void** request);
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// Asynchronous recv from a peer.
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// May return request == NULL if the call cannot be performed (or would block)
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ncclResult_t (*irecv)(void* recvComm, int n, void** data, int* sizes, int* tags, void** mhandles, void** request);
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// Perform a flush/fence to make sure all data received with NCCL_PTR_CUDA is
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// visible to the GPU
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ncclResult_t (*iflush)(void* recvComm, int n, void** data, int* sizes, void** mhandles, void** request);
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// Test whether a request is complete. If size is not NULL, it returns the
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// number of bytes sent/received.
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ncclResult_t (*test)(void* request, int* done, int* sizes);
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// Close and free send/recv comm objects
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ncclResult_t (*closeSend)(void* sendComm);
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ncclResult_t (*closeRecv)(void* recvComm);
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ncclResult_t (*closeListen)(void* listenComm);
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} ncclNet_v5_t;
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typedef ncclNet_v5_t ncclNet_t;
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#define NCCL_PLUGIN_SYMBOL ncclNetPlugin_v5
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typedef struct {
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// Name of the collective network (mainly for logs)
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const char* name;
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// Initialize the collective network.
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ncclResult_t (*init)(ncclDebugLogger_t logFunction);
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// Return the number of adapters capable of doing collective operations.
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// If ndev returns 0, all other functions might be set to NULL.
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ncclResult_t (*devices)(int* ndev);
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// Get various device properties.
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ncclResult_t (*getProperties)(int dev, ncclNetProperties_v5_t* props);
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// Create a receiving object and provide a handle to connect to it. The
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// handle can be up to NCCL_NET_HANDLE_MAXSIZE bytes and will be exchanged
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// between ranks to create connections.
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ncclResult_t (*listen)(int dev, void* handle, void** listenComm);
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// Create a group for collective operations. handles have been created
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// using listen() above. rank indicates caller's rank in the collective network.
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ncclResult_t (*connect)(void* handles[], int nranks, int rank, void* listenComm, void** collComm);
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// Returns whether a reduction operation on a data type is supported.
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// 1 for supported, 0 otherwise.
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ncclResult_t (*reduceSupport)(ncclDataType_t dataType, ncclRedOp_t redOp, int* supported);
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// Register/Deregister memory. Type is either NCCL_PTR_HOST or NCCL_PTR_CUDA.
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ncclResult_t (*regMr)(void* collComm, void* data, int size, int type, void** mhandle);
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ncclResult_t (*deregMr)(void* collComm, void* mhandle);
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// Performs an asynchronous allreduce operation on the collective group.
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// May return request == NULL if the call cannot be performed (or would block).
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ncclResult_t (*iallreduce)(void* collComm, void* sendData, void* recvData, int count,
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ncclDataType_t dataType, ncclRedOp_t redOp, void* sendMhandle, void* recvMhandle, void** request);
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// Perform a flush/fence to make sure all data received with NCCL_PTR_CUDA is
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// visible to the GPU
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ncclResult_t (*iflush)(void* collComm, void* data, int size, void* mhandle, void** request);
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// Test whether a request is complete. If size is not NULL, it returns the
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// number of bytes sent/received.
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ncclResult_t (*test)(void* request, int* done, int* size);
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// Close and free collective comm objects
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ncclResult_t (*closeColl)(void* collComm);
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ncclResult_t (*closeListen)(void* listenComm);
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} ncclCollNet_v5_t;
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typedef ncclCollNet_v5_t ncclCollNet_t;
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#define NCCL_COLLNET_PLUGIN_SYMBOL ncclCollNetPlugin_v5
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typedef struct {
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char* name; // Used mostly for logging.
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char* pciPath; // Path to the PCI device in /sys.
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uint64_t guid; // Unique identifier for the NIC chip. Important for
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// cards with multiple PCI functions (Physical or virtual).
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int ptrSupport; // NCCL_PTR_HOST or NCCL_PTR_HOST|NCCL_PTR_CUDA
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int speed; // Port speed in Mbps.
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int port; // Port number.
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int maxComms; // Maximum number of comms we can create
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} ncclNetProperties_v4_t;
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typedef struct {
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// Name of the network (mainly for logs)
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const char* name;
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// Initialize the network.
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ncclResult_t (*init)(ncclDebugLogger_t logFunction);
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// Return the number of adapters.
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ncclResult_t (*devices)(int* ndev);
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// Get various device properties.
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ncclResult_t (*getProperties)(int dev, ncclNetProperties_v4_t* props);
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// Create a receiving object and provide a handle to connect to it. The
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// handle can be up to NCCL_NET_HANDLE_MAXSIZE bytes and will be exchanged
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// between ranks to create a connection.
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ncclResult_t (*listen)(int dev, void* handle, void** listenComm);
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// Connect to a handle and return a sending comm object for that peer.
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ncclResult_t (*connect)(int dev, void* handle, void** sendComm);
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// Finalize connection establishment after remote peer has called connectHandle
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ncclResult_t (*accept)(void* listenComm, void** recvComm);
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// Register/Deregister memory. Comm can be either a sendComm or a recvComm.
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// Type is either NCCL_PTR_HOST or NCCL_PTR_CUDA.
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ncclResult_t (*regMr)(void* comm, void* data, int size, int type, void** mhandle);
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ncclResult_t (*deregMr)(void* comm, void* mhandle);
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// Asynchronous send to a peer.
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// May return request == NULL if the call cannot be performed (or would block)
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ncclResult_t (*isend)(void* sendComm, void* data, int size, void* mhandle, void** request);
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// Asynchronous recv from a peer.
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// May return request == NULL if the call cannot be performed (or would block)
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ncclResult_t (*irecv)(void* recvComm, void* data, int size, void* mhandle, void** request);
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// Perform a flush/fence to make sure all data received with NCCL_PTR_CUDA is
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// visible to the GPU
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ncclResult_t (*iflush)(void* recvComm, void* data, int size, void* mhandle, void** request);
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// Test whether a request is complete. If size is not NULL, it returns the
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// number of bytes sent/received.
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ncclResult_t (*test)(void* request, int* done, int* size);
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// Close and free send/recv comm objects
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ncclResult_t (*closeSend)(void* sendComm);
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ncclResult_t (*closeRecv)(void* recvComm);
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ncclResult_t (*closeListen)(void* listenComm);
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} ncclNet_v4_t;
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typedef struct {
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// Name of the collective network (mainly for logs)
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const char* name;
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// Initialize the collective network.
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ncclResult_t (*init)(ncclDebugLogger_t logFunction);
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// Return the number of adapters capable of doing collective operations.
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// If ndev returns 0, all other functions might be set to NULL.
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ncclResult_t (*devices)(int* ndev);
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// Get various device properties.
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ncclResult_t (*getProperties)(int dev, ncclNetProperties_v4_t* props);
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// Create a receiving object and provide a handle to connect to it. The
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// handle can be up to NCCL_NET_HANDLE_MAXSIZE bytes and will be exchanged
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// between ranks to create connections.
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ncclResult_t (*listen)(int dev, void* handle, void** listenComm);
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// Create a group for collective operations. handles have been created
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// using listen() above. rank indicates caller's rank in the collective network.
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ncclResult_t (*connect)(void* handles[], int nranks, int rank, void* listenComm, void** collComm);
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// Returns whether a reduction operation on a data type is supported.
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// 1 for supported, 0 otherwise.
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ncclResult_t (*reduceSupport)(ncclDataType_t dataType, ncclRedOp_t redOp, int* supported);
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// Register/Deregister memory. Type is either NCCL_PTR_HOST or NCCL_PTR_CUDA.
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ncclResult_t (*regMr)(void* collComm, void* data, int size, int type, void** mhandle);
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ncclResult_t (*deregMr)(void* collComm, void* mhandle);
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// Performs an asynchronous allreduce operation on the collective group.
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// May return request == NULL if the call cannot be performed (or would block).
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ncclResult_t (*iallreduce)(void* collComm, void* sendData, void* recvData, int count,
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ncclDataType_t dataType, ncclRedOp_t redOp, void* sendMhandle, void* recvMhandle, void** request);
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// Perform a flush/fence to make sure all data received with NCCL_PTR_CUDA is
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// visible to the GPU
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ncclResult_t (*iflush)(void* collComm, void* data, int size, void* mhandle, void** request);
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// Test whether a request is complete. If size is not NULL, it returns the
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// number of bytes sent/received.
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ncclResult_t (*test)(void* request, int* done, int* size);
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// Close and free collective comm objects
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ncclResult_t (*closeColl)(void* collComm);
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ncclResult_t (*closeListen)(void* listenComm);
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} ncclCollNet_v4_t;
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#endif // end include guard
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