网络计算技术加速 GPU 应用.pdf

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1、NVIDIAIN-NETWORK COMPUTINGPROGRAMMING FOR GPUAPPLICATIONSGTC CHINA 2020Qingchun SongDecember 2020#page#AGENDAREMOTE DIRECT MEMORY ACCESS (RDMAGPU DIRECT RDMA（GDR）GPU DIRECT STORAGE (GDS） SCALABLE HIERARCHICAL AGGREGATION ANDREDUCTION PROTOCOL (SHARPNCCL SHARP会#page#REMOTE DIRECT MEMORYACCESS (RDMA）#

2、page#INFINIBANDS LAYERED ARCHITECTUREUpper LevelClientClientprotocolsIBAIBAOperationsOperationsTransportMessagesLayerQP）SARSARInter Subnet RoutingNetworkNetworkNetwork（IFv6）LayerPacket5UdLink买LinkyuEncodingEncodingLinkLayerMediaMediaFlowMAAcCOSSACCOSSControrControlControlSignaingPhysicalEnd NodeSwit

3、chRouterEndNodeLayer#page#RDMA DATA TRANSFER MODELQueue Pair (QP）QPs are in pairs (Send/Receive）TransmitReceiveWork Request（WR）RecetvdTransmitRemote QPLocal QPWork items that the HW should performWorkQueueConWork Completion （completion）When a WR is completed,it may create a Work Completionwhich prov

4、ides information about the ended WRWQEWQEWork Queue (WQ）WorkQueueWQEWQEA queue which contains WRsScheduled by the HWCompletiow QueuICQEICQECQECQECan be either Send or Receive QueueCompletion Queue （CQ）#page#RDMA OPERATION: SENDThe responder Post Receive Requests (before datais received）RequesterResb

5、onderThe requester Post Send RequestSyncPost RROnly data is sent over the wirePost SRdataACK is sent only in reliable transport typesACKPollcaPollcQ#page#RDMA OPERATION: RDMA WRITEThe requester Post Send RequestRequesterResponderData and remote memory attributes are sentResponder is passivePostSRKa+

6、ppe+elepImmediate data can be used to consume RRs atthe responder sideACKACK is sent only in reliable transport typesPollcQ#page#RDMA OPERATION: RDMA READThe requester Post Send RequestRequesterResponderData and remote memory attributes are sentResponder is passivePost SRaddr+rkeyData is sent from t