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Introduction

rdma_comm_core is a wrapper of rdma communication primitives implemented in the C++ programming language, which includes SEND, RECV, WRITE, READ, WRITE_WITH_IMM. It support multiple work request processed concurrently to maximun the performance.

rdma_comm_core works for the Linux platform and tested on Ubuntu 1604.

Basic Design

Event Mode

In general, RDMA works in the asynchronous event-driven fashion for high performance, and rdma_comm_core supports three basic working modes.

  • polling-aggressively: In this mode, thread(s) would proactively poll the completion queue without blocking to fetch the executing result (success or failure) of work requests submitted before. Application working in this mode may be latency-sensitive, accordingly, CPU resources are required.
  • completion channel: In this mode, the thread(s) to fetch the results would be stuck in the function (ibv_get_cq_event) until waked up by a new incoming event(success or failure). Application working in this mode can save many CPU resources, accordingly, the processing latency increases.
  • epoll: In this mode, users can set a global epoll resource to listen to the event for a group of completion queues while not being blocked by the API. By setting a timeout, the polling thread can be released to process other workflows despite no new incoming events.

Thread Mode

rdma_comm_core is based on thread mode. Currently, it supports two thread modes as follows:

  • Per-thread-per-QPair: In this mode, assign a private thread to each QPair to track the work request state in their completion queues.
  • Shared-CQ: In this mode, multiple QPairs may share a global completion queue(CQ) to track the wqe executing status.

The Thread Mode is configured in void lazy_config_hca(), which should be implemented by sub-class.

Architecture Overview

The architecture overview of rdma_comm_core is shown below.

Architecture Overview

There are two roles distinguished in rdma_comm_core.

  • ServerSession is inherited from RDMASession and handles the workflow of server sides, such as listen to and accept new connection requests. Once a new connection request is detected, the ServerSession would allocate corresponding resources and interacts with the client side to establish the connection.
  • ClientSession is inherited from RDMASession and handles the workflow of client sides. It interacts with ServerSession to finish the connection.

Both ServerSession and ClientSession use EndPoint to identify the connection. Differently, ServerSession may have multiple EndPoints to deal with different connections individually, while there is only an EndPoint in the ClientSession to deal with data exchange with the server side.

Dive into an EndPoint

rdma_comm_core allocates an individual EndPoint to manage each connection in both ClientSession and ServerSession once a connection request is generated/detected. Below is the inside of an EndPoint. Inside of an EndPoint

Basic Components

Before showing how EndPoint works, we would introduce each component first.

  • RDMADevice is the abstraction of RDMA device, and each instance is bound to the hardware device(e.g., NIC) and provides basic services, such as query/modify device attributes/status, SEND, RECV, WRITE(-WITH_IMM), READ, manage the context/resources of hardware, etc.
  • RDMAAdapter is the lower abstraction of an RDMA connection context. It is instanced once a connection is launched and interacts with RDMADevice to process and connection workflow.
  • RDMAChannel is the higher abstraction of an RDMA connection context. It is inherited from RDMAAdapter and interacts with applications to process and user-space workflow.
  • TCPConnector is a wrapper of TCP Socket and serves as a helper to exchange necessary information when establishing the RDMA connection.
  • RDMABuffer is the memory manager exposed to the upper applications to provide placeholders for communication workflow.

Organization

  • There is at least one TCPConnector owned by an EndPoint as a helper when establishing the connections.
  • Additionally, there may be one or more RDMAChannel in an EndPoint to address different communication services.
  • All communication requests from the upper application are submitted to RDMAAdapter by RDMAChannel and finally processed by RDMADevice.

Installation and Usages

There are three examples included in the repository, located in the subdirectory named example.

Requirements

rdma_comm_core uses customized log and backtraces that may require installation before use. All related third libraries are listed as follows.

  • cmake is used as the project management system, rdma_comm_core requires a cmake with version(>=3.18) to simplify the compiling process.
  • google-glog is a popular log system. rdma_comm_core uses the RLOG customized from google-glog to show the execution process with different levels (specified by RCL_MAX_VLOG_LEVEL=XXX)
  • backward-cpp is a popular backtracing subsystem. rdma_comm_core uses backtrace_service customized from backward-cpp to address the runtime exception.
  • gcc/g++ is used in rdma_comm_core as the default compiler. Particularly, the version of gcc/g++ should be >= 9.3.0 to support the C++ grammar used in rdma_comm_core.

Examples

  • ping_pong_test is a connection test for any rdma connection pair. It uses default processing workflows on server and client sides.
  • lat_bw_benchmark is a customized benchmark to evaluate the latency and throughput of RDMA communication primitives (including SEND, RECV, WRITE, READ), by re-implementing the RDMAClientSession and RDMAServerSession.
  • mesh_comm_service is a full-mesh communication test among N nodes, where each has N-1 ClientSession and a ServerSession to WRITE/RECV data simultaneously.

Run Example

We Run the lat_bw_benchmark as the example to show the whole workflow:

compile

mkdir build; cd build; cmake .. -GNinja; ninja;

Run Server

~/t/F/3/r/build (main)> RCL_MAX_VLOG_LEVEL=3 ./lat_bw_benchmark --role=master
RCL_MAX_VLOG_LEVEL is set to 3, indicating level in VLOG (level) less than 3 would show
WARNING: Logging before InitGoogleLogging() is written to STDERR
I0923 18:30:27.148751 17905 rdma_session.cc:36] Creating a new RDMASession for
I0923 18:30:27.149014 17905 rdma_server_sess.cc:15] Creating a new RDMAServerSession for ConnectionTest
I0923 18:30:27.149031 17905 lat_bw_benchmark.cc:523] Creating SchedulingServer
I0923 18:30:27.149052 17905 tcp_connector.cc:118] Preparing socket for RDMAServerSession
I0923 18:30:27.149076 17905 tcp_connector.cc:123] Creating a socket: 3 for RDMAServerSession
[INFO] Having modified IP ToS for socket: 3 from 0x0(old) to 0x10(new)
[INFO] Having modified IP priority for socket: 3 from 6(old) to 4(new)
[INFO] Having set IP port resue
I0923 18:30:27.149133 17905 tcp_connector.cc:128] [Done] Preparing socket...
I0923 18:30:27.149145 17905 rdma_server_sess.cc:29] RDMAServer is preparing everything for accepting new connections
I0923 18:30:27.149181 17905 rdma_server_sess.cc:46] The server is listening on 2020
I0923 18:30:32.648588 17905 rdma_session.cc:156] Handles new connect request by @ConnectionTest
I0923 18:30:32.648682 17905 rdma_session.cc:159] the remote info of connection request is 12.12.12.113:60878
I0923 18:30:32.648783 17905 rdma_endpoint.cc:23] Create RDMAEndPoint
I0923 18:30:32.648993 17905 rdma_endpoint.cc:29] Connection Test OK for TCPConnector@RDMAEndPoint@[12.12.12.111:2020-->12.12.12.113:60878]@@ConnectionTest
I0923 18:30:32.649061 17905 rdma_endpoint.cc:91] creating&preparing an rdma channel for DataChannel
I0923 18:30:32.649116 17905 rdma_adapter.cc:20] Creating a (virtual) adapter for DataChannel
I0923 18:30:32.649149 17905 rdma_channel.cc:10] Creating RDMAChannel with id: DataChannel
I0923 18:30:32.649423 17905 rdma_server_sess.cc:61] received connection: 1/0
I0923 18:30:32.749850 17906 rdma_adapter.cc:45] RDMAAdapter@(DataChannel)[12.12.12.111:2020-->12.12.12.113:60878]@@ConnectionTest would not use shared_cq, the cq is: RDMAAdapter@(DataChannel)[12.12.12.111:2020-->12.12.12.113:60878]@@ConnectionTest
I0923 18:30:32.749887 17906 rdma_adapter.cc:47] Preparing the resources of RDMAAdapter@(DataChannel)[12.12.12.111:2020-->12.12.12.113:60878]@@ConnectionTest
I0923 18:30:32.749915 17906 rdma_device.cc:102] Try to get the RDMADevice(mlx5_0) for RDMAAdapter@(DataChannel)[12.12.12.111:2020-->12.12.12.113:60878]@@ConnectionTest
I0923 18:30:32.749997 17906 rdma_device.cc:108] Warning: RDMADevice (mlx5_0) do not exist
I0923 18:30:32.750052 17906 rdma_device.cc:67] Creating RDMADevice(mlx5_0)
I0923 18:30:32.750072 17906 rdma_device.cc:128] The sys params are: cache_line: 64, page_size: 4096
I0923 18:30:32.750319 17906 rdma_device.cc:205] found 1 device(s)
I0923 18:30:32.757339 17906 rdma_device.cc:136] Open device (mlx5_0@0x7fd2fdc2c150)
I0923 18:30:32.757390 17906 rdma_device.cc:150] RDMADevice(mlx5_0) has 1 physical ports
I0923 18:30:32.757695 17906 rdma_device.cc:177] Info on (1)th port of RDMADevice(mlx5_0) is:
port_state: 4, max_mtu: 5, activate_mtu: 3, lid: 0, sm_lid: 0, link_layer=2.
For more details, please ref to[https://github.com/linux-rdma/rdma-core/blob/486ecb3f12ab17e4b7970a6d5444cd165cec6ee4/libibverbs/verbs.h#L423]
I0923 18:30:32.757964 17906 rdma_device.cc:74] Try to register an RDMAAdapter in RDMADevice(mlx5_0)
I0923 18:30:32.758067 17906 rdma_device.cc:86] [Success]: Register RDMAAdapter@(DataChannel)[12.12.12.111:2020-->12.12.12.113:60878]@@ConnectionTest into RDMADevice(mlx5_0)
I0923 18:30:32.758093 17906 rdma_device.cc:119] return RDMADevice(mlx5_0) for RDMAAdapter@(DataChannel)[12.12.12.111:2020-->12.12.12.113:60878]@@ConnectionTest
I0923 18:30:32.758273 17906 rdma_adapter.cc:97] Creating protection domain(0x7fd2f4000c40) for RDMAAdapter@(DataChannel)[12.12.12.111:2020-->12.12.12.113:60878]@@ConnectionTest
I0923 18:30:32.758309 17906 rdma_adapter.cc:189] RDMAAdapter@(DataChannel)[12.12.12.111:2020-->12.12.12.113:60878]@@ConnectionTest works in active model, i.e., poll it dramatically
I0923 18:30:32.758383 17906 rdma_device.cc:301] Trying to find the completion queue(CQ), named RDMAAdapter@(DataChannel)[12.12.12.111:2020-->12.12.12.113:60878]@@ConnectionTest in RDMADevice(mlx5_0)
I0923 18:30:32.759755 17906 rdma_device.cc:321] CQ, named RDMAAdapter@(DataChannel)[12.12.12.111:2020-->12.12.12.113:60878]@@ConnectionTest is not found in RDMADevice(mlx5_0), create one (0x7fd2f4001470) now!
I0923 18:30:32.759783 17906 rdma_adapter.cc:132] The CQ@RDMAAdapter@(DataChannel)[12.12.12.111:2020-->12.12.12.113:60878]@@ConnectionTest (@0x7fd2f4001470) is privated
I0923 18:30:32.759793 17906 rdma_adapter.cc:64] Trying to create QPair@RDMAAdapter@(DataChannel)[12.12.12.111:2020-->12.12.12.113:60878]@@ConnectionTest
W0923 18:30:32.759810 17906 rdma_adapter.cc:76] CQ@RDMAAdapter@(DataChannel)[12.12.12.111:2020-->12.12.12.113:60878]@@ConnectionTest would not generate a signal for sqe
I0923 18:30:32.761607 17906 rdma_adapter.cc:88] [OK]: Successfully create queue_pair(0x7fd2f4001738) for RDMAAdapter@(DataChannel)[12.12.12.111:2020-->12.12.12.113:60878]@@ConnectionTest
I0923 18:30:32.761658 17906 rdma_adapter.cc:147] Updating the info of RDMAAdapter@(DataChannel)[12.12.12.111:2020-->12.12.12.113:60878]@@ConnectionTest
W0923 18:30:32.761695 17906 rdma_adapter.cc:157] The actived mtu(3) is less than the config (5), reset it
I0923 18:30:32.761936 17906 rdma_adapter.cc:221] RDMAAdapter@(DataChannel)[12.12.12.111:2020-->12.12.12.113:60878]@@ConnectionTest is trying to connect to the remote (i.e., RDMAAdapter@(DataChannel)[12.12.12.113:60878-->12.12.12.111:2020]@slaver@ConnectionTest)
=====================================================================
=  Local Adapter ID 	= RDMAAdapter@(DataChannel)[12.12.12.111:2020-->12.12.12.113:60878]@@ConnectionTest
=  Remote Adapter ID 	= RDMAAdapter@(DataChannel)[12.12.12.113:60878-->12.12.12.111:2020]@slaver@ConnectionTest
=  Local QP number = 0x2f,	Remote QP number = 0x737c
=  Local LID 	= 0x0,		Remote LID 	= 0x0
=  Self GID 	= 00:00:00:00:00:00:00:00:00:00:ff:ff:0c:0c:0c:6f
=  Remote GID 	= 00:00:00:00:00:00:00:00:00:00:ff:ff:0c:0c:0c:71
=====================================================================
I0923 18:30:32.761981 17906 rdma_adapter.cc:340] Modifying QP to INIT, preparing to work
I0923 18:30:32.762881 17906 rdma_device.cc:277] Querying the attr of QP (0x7fd2f4001738) in RDMADevice(mlx5_0)
I0923 18:30:32.763243 17906 rdma_adapter.cc:140] Show the qp info in (INIT):
qp_state: 1, mtu: 1
I0923 18:30:32.763267 17906 rdma_adapter.cc:289] Modify QP to RTR, ready to receive
I0923 18:30:32.763274 17906 rdma_adapter.cc:299] Configuure the path_mtu to: 3
I0923 18:30:32.763280 17906 rdma_adapter.cc:316] Using RoCE
W0923 18:30:32.763285 17906 rdma_adapter.cc:326] Using traffic class 0
I0923 18:30:32.764590 17906 rdma_device.cc:277] Querying the attr of QP (0x7fd2f4001738) in RDMADevice(mlx5_0)
I0923 18:30:32.764794 17906 rdma_adapter.cc:140] Show the qp info in (RTR):
qp_state: 2, mtu: 3
I0923 18:30:32.764815 17906 rdma_adapter.cc:265] Modify QP to RTS, ready to send
I0923 18:30:32.765151 17906 rdma_device.cc:277] Querying the attr of QP (0x7fd2f4001738) in RDMADevice(mlx5_0)
I0923 18:30:32.765313 17906 rdma_adapter.cc:140] Show the qp info in (RTS):
qp_state: 3, mtu: 3
I0923 18:30:32.766242 17907 rdma_buffer.cc:139] Creating buffer : benchmark_buffer
I0923 18:30:32.766312 17907 rdma_buffer.cc:148] [OK] allocating mem for (benchmark_buffer):  @0x7fd0fffff000, with size: 8388608000
I0923 18:30:32.766335 17907 rdma_buffer.cc:152] Spliting the buffer benchmark_buffer into 1000 piece(s)
I0923 18:30:32.770346 17907 rdma_channel.cc:39] Registering buffer (name = benchmark_buffer, size = 8388608000) into RDMAChannel@(DataChannel)[12.12.12.111:2020-->12.12.12.113:60878]@@ConnectionTest
W0923 18:30:32.770390 17907 rdma_device.cc:598] No flags for the mem buf (benchmark_buffer), using the default access mode: (IBV_ACCESS_LOCAL_WRITE | IBV_ACCESS_REMOTE_READ | IBV_ACCESS_REMOTE_WRITE)
I0923 18:30:35.856914 17907 rdma_device.cc:617] [OK] register mem for (benchmark_buffer):  @0x7fd0fffff000, with size: 8388608000, and flags: 0x7, lkey: 0x6e00, rkey: 0x6e00
I0923 18:30:35.857262 17907 rdma_device.cc:437] Post receive request to RQ
I0923 18:30:35.857275 17907 lat_bw_benchmark.cc:425] Register buffer for test@@ConnectionTest
I0923 18:30:36.065896 17907 rdma_device.cc:383] polled wqe: 1
I0923 18:30:36.065971 17907 rdma_device.cc:394] Post send request to SQ
I0923 18:30:36.065997 17907 lat_bw_benchmark.cc:465] Exchange buffer Done
I0923 18:30:46.022114 17905 lat_bw_benchmark.cc:527] Destroy SchedulingServer
I0923 18:30:46.022150 17905 rdma_server_sess.cc:21] Destroying the RDMAServerSession of @ConnectionTest
I0923 18:30:46.022171 17905 rdma_session.cc:55] Destroying the RDMASession of @ConnectionTest
I0923 18:30:46.022207 17905 rdma_endpoint.cc:10] Destroy RDMAEndPoint
I0923 18:30:46.268671 17905 rdma_device.cc:633] Successfully deregister mem for benchmark_buffer
I0923 18:30:46.268790 17905 rdma_channel.cc:63] Buffer(benchmark_buffer) has been removed from RDMAChannel@(DataChannel)[12.12.12.111:2020-->12.12.12.113:60878]@@ConnectionTest
I0923 18:30:46.268828 17905 rdma_channel.cc:25] Destroying RDMAChannel with id: DataChannel
I0923 18:30:46.268864 17905 rdma_adapter.cc:12] RDMAAdapter is released
I0923 18:30:46.269376 17905 rdma_device.cc:60] RDMADevice(mlx5_0) is released
~/t/F/3/r/build (main)>

Run Client

~/t/F/3/r/build (main)> RCL_MAX_VLOG_LEVEL=3 ./lat_bw_benchmark --role=slaver --master=12.12.12.111
RCL_MAX_VLOG_LEVEL is set to 3, indicating level in VLOG (level) less than 3 would show
WARNING: Logging before InitGoogleLogging() is written to STDERR
I0923 18:30:32.639127 56562 rdma_session.cc:36] Creating a new RDMASession for slaver
I0923 18:30:32.639392 56562 rdma_client_sess.cc:16] Creating a new RDMAClientSession for ConnectionTest
I0923 18:30:32.639410 56562 lat_bw_benchmark.cc:335] Creating SchedulingClient
I0923 18:30:32.639456 56562 tcp_connector.cc:118] Preparing socket for RDMAClientSession
I0923 18:30:32.639480 56562 tcp_connector.cc:123] Creating a socket: 3 for RDMAClientSession
[INFO] Having modified IP ToS for socket: 3 from 0x0(old) to 0x10(new)
[INFO] Having modified IP priority for socket: 3 from 6(old) to 4(new)
[INFO] Having set IP port resue
I0923 18:30:32.639536 56562 tcp_connector.cc:128] [Done] Preparing socket...
I0923 18:30:32.639549 56562 rdma_client_sess.cc:31] RDMAClient has prepared everything for Connecting ...
I0923 18:30:32.639897 56562 rdma_session.cc:156] Handles new connect request by slaver@ConnectionTest
I0923 18:30:32.639953 56562 rdma_session.cc:159] the remote info of connection request is 12.12.12.111:2020
I0923 18:30:32.639997 56562 rdma_endpoint.cc:22] Create RDMAEndPoint
I0923 18:30:32.640374 56562 rdma_endpoint.cc:28] Connection Test OK for TCPConnector@RDMAEndPoint@[12.12.12.113:60878-->12.12.12.111:2020]@slaver@ConnectionTest
I0923 18:30:32.640424 56562 rdma_endpoint.cc:90] creating&preparing an rdma channel for DataChannel
I0923 18:30:32.640468 56562 rdma_adapter.cc:20] Creating a (virtual) adapter for DataChannel
I0923 18:30:32.640497 56562 rdma_channel.cc:10] Creating RDMAChannel with id: DataChannel
I0923 18:30:32.640698 56562 rdma_client_sess.cc:54] [Done] Connecting ...
I0923 18:30:32.741190 56563 rdma_adapter.cc:45] RDMAAdapter@(DataChannel)[12.12.12.113:60878-->12.12.12.111:2020]@slaver@ConnectionTest would not use shared_cq, the cq is: RDMAAdapter@(DataChannel)[12.12.12.113:60878-->12.12.12.111:2020]@slaver@ConnectionTest
I0923 18:30:32.741240 56563 rdma_adapter.cc:47] Preparing the resources of RDMAAdapter@(DataChannel)[12.12.12.113:60878-->12.12.12.111:2020]@slaver@ConnectionTest
I0923 18:30:32.741262 56563 rdma_device.cc:102] Try to get the RDMADevice(mlx5_0) for RDMAAdapter@(DataChannel)[12.12.12.113:60878-->12.12.12.111:2020]@slaver@ConnectionTest
I0923 18:30:32.741369 56563 rdma_device.cc:108] Warning: RDMADevice (mlx5_0) do not exist
I0923 18:30:32.741434 56563 rdma_device.cc:67] Creating RDMADevice(mlx5_0)
I0923 18:30:32.741454 56563 rdma_device.cc:128] The sys params are: cache_line: 64, page_size: 4096
I0923 18:30:32.741744 56563 rdma_device.cc:205] found 1 device(s)
I0923 18:30:32.748852 56563 rdma_device.cc:136] Open device (mlx5_0@0x7f5c2ebc9150)
I0923 18:30:32.748904 56563 rdma_device.cc:150] RDMADevice(mlx5_0) has 1 physical ports
I0923 18:30:32.749178 56563 rdma_device.cc:177] Info on (1)th port of RDMADevice(mlx5_0) is:
port_state: 4, max_mtu: 5, activate_mtu: 3, lid: 0, sm_lid: 0, link_layer=2.
For more details, please ref to[https://github.com/linux-rdma/rdma-core/blob/486ecb3f12ab17e4b7970a6d5444cd165cec6ee4/libibverbs/verbs.h#L423]
I0923 18:30:32.749398 56563 rdma_device.cc:74] Try to register an RDMAAdapter in RDMADevice(mlx5_0)
I0923 18:30:32.749483 56563 rdma_device.cc:86] [Success]: Register RDMAAdapter@(DataChannel)[12.12.12.113:60878-->12.12.12.111:2020]@slaver@ConnectionTest into RDMADevice(mlx5_0)
I0923 18:30:32.749512 56563 rdma_device.cc:119] return RDMADevice(mlx5_0) for RDMAAdapter@(DataChannel)[12.12.12.113:60878-->12.12.12.111:2020]@slaver@ConnectionTest
I0923 18:30:32.749676 56563 rdma_adapter.cc:97] Creating protection domain(0x7f5c24000c10) for RDMAAdapter@(DataChannel)[12.12.12.113:60878-->12.12.12.111:2020]@slaver@ConnectionTest
I0923 18:30:32.749712 56563 rdma_adapter.cc:189] RDMAAdapter@(DataChannel)[12.12.12.113:60878-->12.12.12.111:2020]@slaver@ConnectionTest works in active model, i.e., poll it dramatically
I0923 18:30:32.749773 56563 rdma_device.cc:301] Trying to find the completion queue(CQ), named RDMAAdapter@(DataChannel)[12.12.12.113:60878-->12.12.12.111:2020]@slaver@ConnectionTest in RDMADevice(mlx5_0)
I0923 18:30:32.751170 56563 rdma_device.cc:321] CQ, named RDMAAdapter@(DataChannel)[12.12.12.113:60878-->12.12.12.111:2020]@slaver@ConnectionTest is not found in RDMADevice(mlx5_0), create one (0x7f5c24001410) now!
I0923 18:30:32.751195 56563 rdma_adapter.cc:132] The CQ@RDMAAdapter@(DataChannel)[12.12.12.113:60878-->12.12.12.111:2020]@slaver@ConnectionTest (@0x7f5c24001410) is privated
I0923 18:30:32.751206 56563 rdma_adapter.cc:64] Trying to create QPair@RDMAAdapter@(DataChannel)[12.12.12.113:60878-->12.12.12.111:2020]@slaver@ConnectionTest
W0923 18:30:32.751224 56563 rdma_adapter.cc:76] CQ@RDMAAdapter@(DataChannel)[12.12.12.113:60878-->12.12.12.111:2020]@slaver@ConnectionTest would not generate a signal for sqe
I0923 18:30:32.753010 56563 rdma_adapter.cc:88] [OK]: Successfully create queue_pair(0x7f5c240016f8) for RDMAAdapter@(DataChannel)[12.12.12.113:60878-->12.12.12.111:2020]@slaver@ConnectionTest
I0923 18:30:32.753041 56563 rdma_adapter.cc:147] Updating the info of RDMAAdapter@(DataChannel)[12.12.12.113:60878-->12.12.12.111:2020]@slaver@ConnectionTest
W0923 18:30:32.753072 56563 rdma_adapter.cc:157] The actived mtu(3) is less than the config (5), reset it
I0923 18:30:32.753273 56563 rdma_adapter.cc:221] RDMAAdapter@(DataChannel)[12.12.12.113:60878-->12.12.12.111:2020]@slaver@ConnectionTest is trying to connect to the remote (i.e., RDMAAdapter@(DataChannel)[12.12.12.111:2020-->12.12.12.113:60878]@@ConnectionTest)
=====================================================================
=  Local Adapter ID 	= RDMAAdapter@(DataChannel)[12.12.12.113:60878-->12.12.12.111:2020]@slaver@ConnectionTest
=  Remote Adapter ID 	= RDMAAdapter@(DataChannel)[12.12.12.111:2020-->12.12.12.113:60878]@@ConnectionTest
=  Local QP number = 0x737c,	Remote QP number = 0x2f
=  Local LID 	= 0x0,		Remote LID 	= 0x0
=  Self GID 	= 00:00:00:00:00:00:00:00:00:00:ff:ff:0c:0c:0c:71
=  Remote GID 	= 00:00:00:00:00:00:00:00:00:00:ff:ff:0c:0c:0c:6f
=====================================================================
I0923 18:30:32.753320 56563 rdma_adapter.cc:340] Modifying QP to INIT, preparing to work
I0923 18:30:32.754289 56563 rdma_device.cc:277] Querying the attr of QP (0x7f5c240016f8) in RDMADevice(mlx5_0)
I0923 18:30:32.754738 56563 rdma_adapter.cc:140] Show the qp info in (INIT):
qp_state: 1, mtu: 1
I0923 18:30:32.754760 56563 rdma_adapter.cc:289] Modify QP to RTR, ready to receive
I0923 18:30:32.754767 56563 rdma_adapter.cc:299] Configuure the path_mtu to: 3
I0923 18:30:32.754772 56563 rdma_adapter.cc:316] Using RoCE
W0923 18:30:32.754778 56563 rdma_adapter.cc:326] Using traffic class 0
I0923 18:30:32.755736 56563 rdma_device.cc:277] Querying the attr of QP (0x7f5c240016f8) in RDMADevice(mlx5_0)
I0923 18:30:32.755906 56563 rdma_adapter.cc:140] Show the qp info in (RTR):
qp_state: 2, mtu: 3
I0923 18:30:32.755924 56563 rdma_adapter.cc:265] Modify QP to RTS, ready to send
I0923 18:30:32.756201 56563 rdma_device.cc:277] Querying the attr of QP (0x7f5c240016f8) in RDMADevice(mlx5_0)
I0923 18:30:32.756348 56563 rdma_adapter.cc:140] Show the qp info in (RTS):
qp_state: 3, mtu: 3
I0923 18:30:32.757445 56564 rdma_buffer.cc:139] Creating buffer : benchmark_buffer
I0923 18:30:32.757514 56564 rdma_buffer.cc:148] [OK] allocating mem for (benchmark_buffer):  @0x7f5a2ffff000, with size: 8388608000
I0923 18:30:32.757537 56564 rdma_buffer.cc:152] Spliting the buffer benchmark_buffer into 1000 piece(s)
I0923 18:30:32.766975 56564 rdma_channel.cc:39] Registering buffer (name = benchmark_buffer, size = 8388608000) into RDMAChannel@(DataChannel)[12.12.12.113:60878-->12.12.12.111:2020]@slaver@ConnectionTest
W0923 18:30:32.767031 56564 rdma_device.cc:598] No flags for the mem buf (benchmark_buffer), using the default access mode: (IBV_ACCESS_LOCAL_WRITE | IBV_ACCESS_REMOTE_READ | IBV_ACCESS_REMOTE_WRITE)
I0923 18:30:36.056674 56564 rdma_device.cc:617] [OK] register mem for (benchmark_buffer):  @0x7f5a2ffff000, with size: 8388608000, and flags: 0x7, lkey: 0x3200, rkey: 0x3200
I0923 18:30:36.057029 56564 rdma_device.cc:437] Post receive request to RQ
I0923 18:30:36.057041 56564 lat_bw_benchmark.cc:56] Register buffer for test@slaver@ConnectionTest
I0923 18:30:36.057101 56564 rdma_device.cc:394] Post send request to SQ
I0923 18:30:36.057134 56564 rdma_device.cc:383] polled wqe: 1
I0923 18:30:36.057377 56564 lat_bw_benchmark.cc:97] Exchange buffer Done
I0923 18:30:37.075444 56564 lat_bw_benchmark.cc:164] Latency for send (1 bytes): 6.577 us/op
I0923 18:30:37.089924 56564 lat_bw_benchmark.cc:164] Latency for send (2 bytes): 3.095 us/op
I0923 18:30:37.104373 56564 lat_bw_benchmark.cc:164] Latency for send (4 bytes): 3.126 us/op
I0923 18:30:37.118826 56564 lat_bw_benchmark.cc:164] Latency for send (8 bytes): 3.133 us/op
I0923 18:30:37.133219 56564 lat_bw_benchmark.cc:164] Latency for send (16 bytes): 3.079 us/op
I0923 18:30:37.147665 56564 lat_bw_benchmark.cc:164] Latency for send (32 bytes): 3.141 us/op
I0923 18:30:37.162684 56564 lat_bw_benchmark.cc:164] Latency for send (64 bytes): 3.708 us/op
I0923 18:30:37.180263 56564 lat_bw_benchmark.cc:164] Latency for send (128 bytes): 6.273 us/op
I0923 18:30:37.195271 56564 lat_bw_benchmark.cc:164] Latency for send (256 bytes): 3.699 us/op
I0923 18:30:37.210341 56564 lat_bw_benchmark.cc:164] Latency for send (512 bytes): 3.758 us/op
I0923 18:30:37.225495 56564 lat_bw_benchmark.cc:164] Latency for send (1 K bytes): 3.836 us/op
I0923 18:30:37.240799 56564 lat_bw_benchmark.cc:164] Latency for send (2 K bytes): 4.006 us/op
I0923 18:30:37.256436 56564 lat_bw_benchmark.cc:164] Latency for send (4 K bytes): 4.332 us/op
I0923 18:30:37.272644 56564 lat_bw_benchmark.cc:164] Latency for send (8 K bytes): 4.901 us/op
I0923 18:30:37.292289 56564 lat_bw_benchmark.cc:164] Latency for send (16 K bytes): 8.347 us/op
I0923 18:30:37.312119 56564 lat_bw_benchmark.cc:164] Latency for send (32 K bytes): 8.523 us/op
I0923 18:30:37.335009 56564 lat_bw_benchmark.cc:164] Latency for send (64 K bytes): 11.585 us/op
I0923 18:30:37.364318 56564 lat_bw_benchmark.cc:164] Latency for send (128 K bytes): 17.989 us/op
I0923 18:30:37.406774 56564 lat_bw_benchmark.cc:164] Latency for send (256 K bytes): 31.142 us/op
I0923 18:30:37.475414 56564 lat_bw_benchmark.cc:164] Latency for send (512 K bytes): 57.323 us/op
I0923 18:30:37.595424 56564 lat_bw_benchmark.cc:164] Latency for send (1 M bytes): 108.685 us/op
I0923 18:30:37.823168 56564 lat_bw_benchmark.cc:164] Latency for send (2 M bytes): 216.417 us/op
I0923 18:30:38.255426 56564 lat_bw_benchmark.cc:164] Latency for send (4 M bytes): 420.915 us/op
I0923 18:30:39.100522 56564 lat_bw_benchmark.cc:164] Latency for send (8 M bytes): 833.782 us/op
I0923 18:30:39.104753 56564 lat_bw_benchmark.cc:200] Latency for write (1 bytes): 3.112 us/op
I0923 18:30:39.108773 56564 lat_bw_benchmark.cc:200] Latency for write (2 bytes): 2.903 us/op
I0923 18:30:39.112769 56564 lat_bw_benchmark.cc:200] Latency for write (4 bytes): 2.867 us/op
I0923 18:30:39.116760 56564 lat_bw_benchmark.cc:200] Latency for write (8 bytes): 2.871 us/op
I0923 18:30:39.120793 56564 lat_bw_benchmark.cc:200] Latency for write (16 bytes): 2.913 us/op
I0923 18:30:39.124754 56564 lat_bw_benchmark.cc:200] Latency for write (32 bytes): 2.855 us/op
I0923 18:30:39.128813 56564 lat_bw_benchmark.cc:200] Latency for write (64 bytes): 2.938 us/op
I0923 18:30:39.132819 56564 lat_bw_benchmark.cc:200] Latency for write (128 bytes): 2.904 us/op
I0923 18:30:39.136874 56564 lat_bw_benchmark.cc:200] Latency for write (256 bytes): 2.928 us/op
I0923 18:30:39.141011 56564 lat_bw_benchmark.cc:200] Latency for write (512 bytes): 3.016 us/op
I0923 18:30:39.145241 56564 lat_bw_benchmark.cc:200] Latency for write (1 K bytes): 3.112 us/op
I0923 18:30:39.149686 56564 lat_bw_benchmark.cc:200] Latency for write (2 K bytes): 3.323 us/op
I0923 18:30:39.154464 56564 lat_bw_benchmark.cc:200] Latency for write (4 K bytes): 3.677 us/op
I0923 18:30:39.159955 56564 lat_bw_benchmark.cc:200] Latency for write (8 K bytes): 4.374 us/op
I0923 18:30:39.166767 56564 lat_bw_benchmark.cc:200] Latency for write (16 K bytes): 5.691 us/op
I0923 18:30:39.176163 56564 lat_bw_benchmark.cc:200] Latency for write (32 K bytes): 8.274 us/op
I0923 18:30:39.188625 56564 lat_bw_benchmark.cc:200] Latency for write (64 K bytes): 11.359 us/op
I0923 18:30:39.207278 56564 lat_bw_benchmark.cc:200] Latency for write (128 K bytes): 17.533 us/op
I0923 18:30:39.238997 56564 lat_bw_benchmark.cc:200] Latency for write (256 K bytes): 30.586 us/op
I0923 18:30:39.299543 56564 lat_bw_benchmark.cc:200] Latency for write (512 K bytes): 59.426 us/op
I0923 18:30:39.406946 56564 lat_bw_benchmark.cc:200] Latency for write (1 M bytes): 106.286 us/op
I0923 18:30:39.619195 56564 lat_bw_benchmark.cc:200] Latency for write (2 M bytes): 211.122 us/op
I0923 18:30:40.041168 56564 lat_bw_benchmark.cc:200] Latency for write (4 M bytes): 420.851 us/op
I0923 18:30:40.881762 56564 lat_bw_benchmark.cc:200] Latency for write (8 M bytes): 839.442 us/op
I0923 18:30:40.890528 56564 lat_bw_benchmark.cc:327] Latency for read (1 bytes): 7.647 us/op
I0923 18:30:40.894783 56564 lat_bw_benchmark.cc:327] Latency for read (2 bytes): 3.12 us/op
I0923 18:30:40.899071 56564 lat_bw_benchmark.cc:327] Latency for read (4 bytes): 3.165 us/op
I0923 18:30:40.903365 56564 lat_bw_benchmark.cc:327] Latency for read (8 bytes): 3.168 us/op
I0923 18:30:40.907655 56564 lat_bw_benchmark.cc:327] Latency for read (16 bytes): 3.169 us/op
I0923 18:30:40.911936 56564 lat_bw_benchmark.cc:327] Latency for read (32 bytes): 3.16 us/op
I0923 18:30:40.916200 56564 lat_bw_benchmark.cc:327] Latency for read (64 bytes): 3.142 us/op
I0923 18:30:40.920523 56564 lat_bw_benchmark.cc:327] Latency for read (128 bytes): 3.199 us/op
I0923 18:30:40.924831 56564 lat_bw_benchmark.cc:327] Latency for read (256 bytes): 3.199 us/op
I0923 18:30:40.929280 56564 lat_bw_benchmark.cc:327] Latency for read (512 bytes): 3.321 us/op
I0923 18:30:40.933799 56564 lat_bw_benchmark.cc:327] Latency for read (1 K bytes): 3.397 us/op
I0923 18:30:40.938514 56564 lat_bw_benchmark.cc:327] Latency for read (2 K bytes): 3.608 us/op
I0923 18:30:40.943511 56564 lat_bw_benchmark.cc:327] Latency for read (4 K bytes): 3.873 us/op
I0923 18:30:40.948794 56564 lat_bw_benchmark.cc:327] Latency for read (8 K bytes): 4.173 us/op
I0923 18:30:40.954860 56564 lat_bw_benchmark.cc:327] Latency for read (16 K bytes): 4.937 us/op
I0923 18:30:40.962416 56564 lat_bw_benchmark.cc:327] Latency for read (32 K bytes): 6.421 us/op
I0923 18:30:40.973601 56564 lat_bw_benchmark.cc:327] Latency for read (64 K bytes): 10.053 us/op
I0923 18:30:40.991923 56564 lat_bw_benchmark.cc:327] Latency for read (128 K bytes): 17.246 us/op
I0923 18:30:41.024709 56564 lat_bw_benchmark.cc:327] Latency for read (256 K bytes): 31.651 us/op
I0923 18:30:41.086304 56564 lat_bw_benchmark.cc:327] Latency for read (512 K bytes): 60.474 us/op
I0923 18:30:41.208410 56564 lat_bw_benchmark.cc:327] Latency for read (1 M bytes): 120.985 us/op
I0923 18:30:41.448765 56564 lat_bw_benchmark.cc:327] Latency for read (2 M bytes): 239.237 us/op
I0923 18:30:41.927474 56564 lat_bw_benchmark.cc:327] Latency for read (4 M bytes): 477.588 us/op
I0923 18:30:42.865584 56564 lat_bw_benchmark.cc:327] Latency for read (8 M bytes): 936.959 us/op
I0923 18:30:42.865626 56564 lat_bw_benchmark.cc:370] Using round-robin data buffer for BW test
I0923 18:30:42.867002 56564 lat_bw_benchmark.cc:246] BW for write (1 bytes): 0.030303 Gbps
I0923 18:30:42.868515 56564 lat_bw_benchmark.cc:246] BW for write (2 bytes): 0.040404 Gbps
I0923 18:30:42.870071 56564 lat_bw_benchmark.cc:246] BW for write (4 bytes): 0.0742459 Gbps
I0923 18:30:42.871392 56564 lat_bw_benchmark.cc:246] BW for write (8 bytes): 0.323232 Gbps
I0923 18:30:42.872851 56564 lat_bw_benchmark.cc:246] BW for write (16 bytes): 0.378698 Gbps
I0923 18:30:42.874380 56564 lat_bw_benchmark.cc:246] BW for write (32 bytes): 0.633663 Gbps
I0923 18:30:42.875881 56564 lat_bw_benchmark.cc:246] BW for write (64 bytes): 1.35092 Gbps
I0923 18:30:42.877311 56564 lat_bw_benchmark.cc:246] BW for write (128 bytes): 3.55556 Gbps
I0923 18:30:42.878600 56564 lat_bw_benchmark.cc:246] BW for write (256 bytes): 11.0108 Gbps
I0923 18:30:42.880005 56564 lat_bw_benchmark.cc:246] BW for write (512 bytes): 14.2718 Gbps
I0923 18:30:42.881321 56564 lat_bw_benchmark.cc:246] BW for write (1 K bytes): 43.3439 Gbps
I0923 18:30:42.882778 56564 lat_bw_benchmark.cc:246] BW for write (2 K bytes): 49.0539 Gbps
I0923 18:30:42.884287 56564 lat_bw_benchmark.cc:246] BW for write (4 K bytes): 85.7801 Gbps
I0923 18:30:42.886178 56564 lat_bw_benchmark.cc:246] BW for write (8 K bytes): 87.265 Gbps
I0923 18:30:42.888906 56564 lat_bw_benchmark.cc:246] BW for write (16 K bytes): 81.8688 Gbps
I0923 18:30:42.893222 56564 lat_bw_benchmark.cc:246] BW for write (32 K bytes): 82.0739 Gbps
I0923 18:30:42.900738 56564 lat_bw_benchmark.cc:246] BW for write (64 K bytes): 82.2026 Gbps
I0923 18:30:42.925539 56564 lat_bw_benchmark.cc:246] BW for write (128 K bytes): 44.311 Gbps
I0923 18:30:42.952082 56564 lat_bw_benchmark.cc:246] BW for write (256 K bytes): 82.4903 Gbps
I0923 18:30:43.004007 56564 lat_bw_benchmark.cc:246] BW for write (512 K bytes): 82.5667 Gbps
I0923 18:30:43.106720 56564 lat_bw_benchmark.cc:246] BW for write (1 M bytes): 82.5707 Gbps
I0923 18:30:43.310956 56564 lat_bw_benchmark.cc:246] BW for write (2 M bytes): 82.5996 Gbps
I0923 18:30:43.718415 56564 lat_bw_benchmark.cc:246] BW for write (4 M bytes): 82.5843 Gbps
I0923 18:30:44.533110 56564 lat_bw_benchmark.cc:246] BW for write (8 M bytes): 82.4888 Gbps
I0923 18:30:44.533143 56564 lat_bw_benchmark.cc:376] Using one data buffer for BW test
I0923 18:30:44.534597 56564 lat_bw_benchmark.cc:292] BW for write (1 bytes): 0.0235294 Gbps
I0923 18:30:44.535938 56564 lat_bw_benchmark.cc:292] BW for write (2 bytes): 0.0772947 Gbps
I0923 18:30:44.537402 56564 lat_bw_benchmark.cc:292] BW for write (4 bytes): 0.0943953 Gbps
I0923 18:30:44.538902 56564 lat_bw_benchmark.cc:292] BW for write (8 bytes): 0.170213 Gbps
I0923 18:30:44.540205 56564 lat_bw_benchmark.cc:292] BW for write (16 bytes): 0.719101 Gbps
I0923 18:30:44.541656 56564 lat_bw_benchmark.cc:292] BW for write (32 bytes): 0.780488 Gbps
I0923 18:30:44.543131 56564 lat_bw_benchmark.cc:292] BW for write (64 bytes): 1.50147 Gbps
I0923 18:30:44.544441 56564 lat_bw_benchmark.cc:292] BW for write (128 bytes): 5.88506 Gbps
I0923 18:30:44.545745 56564 lat_bw_benchmark.cc:292] BW for write (256 bytes): 11.7029 Gbps
I0923 18:30:44.547050 56564 lat_bw_benchmark.cc:292] BW for write (512 bytes): 23.4057 Gbps
I0923 18:30:44.548503 56564 lat_bw_benchmark.cc:292] BW for write (1 K bytes): 24.9756 Gbps
I0923 18:30:44.549894 56564 lat_bw_benchmark.cc:292] BW for write (2 K bytes): 64.7589 Gbps
I0923 18:30:44.551398 56564 lat_bw_benchmark.cc:292] BW for write (4 K bytes): 89.7753 Gbps
I0923 18:30:44.553236 56564 lat_bw_benchmark.cc:292] BW for write (8 K bytes): 90.896 Gbps
I0923 18:30:44.555785 56564 lat_bw_benchmark.cc:292] BW for write (16 K bytes): 91.7871 Gbps
I0923 18:30:44.559749 56564 lat_bw_benchmark.cc:292] BW for write (32 K bytes): 92.4018 Gbps
I0923 18:30:44.566542 56564 lat_bw_benchmark.cc:292] BW for write (64 K bytes): 92.4018 Gbps
I0923 18:30:44.578979 56564 lat_bw_benchmark.cc:292] BW for write (128 K bytes): 92.5241 Gbps
I0923 18:30:44.602779 56564 lat_bw_benchmark.cc:292] BW for write (256 K bytes): 92.5445 Gbps
I0923 18:30:44.649219 56564 lat_bw_benchmark.cc:292] BW for write (512 K bytes): 92.5609 Gbps
I0923 18:30:44.740983 56564 lat_bw_benchmark.cc:292] BW for write (1 M bytes): 92.5537 Gbps
I0923 18:30:44.923388 56564 lat_bw_benchmark.cc:292] BW for write (2 M bytes): 92.5481 Gbps
I0923 18:30:45.287003 56564 lat_bw_benchmark.cc:292] BW for write (4 M bytes): 92.5655 Gbps
I0923 18:30:46.013114 56564 lat_bw_benchmark.cc:292] BW for write (8 M bytes): 92.5673 Gbps
I0923 18:30:46.013352 56562 lat_bw_benchmark.cc:339] Destroying SchedulingClient
I0923 18:30:46.013383 56562 rdma_client_sess.cc:22] Destroying the RDMAClientSession of ConnectionTest
I0923 18:30:46.013396 56562 rdma_session.cc:55] Destroying the RDMASession of slaver@ConnectionTest
I0923 18:30:46.013443 56562 rdma_endpoint.cc:9] Destroy RDMAEndPoint
I0923 18:30:46.296687 56562 rdma_device.cc:633] Successfully deregister mem for benchmark_buffer
I0923 18:30:46.296794 56562 rdma_channel.cc:63] Buffer(benchmark_buffer) has been removed from RDMAChannel@(DataChannel)[12.12.12.113:60878-->12.12.12.111:2020]@slaver@ConnectionTest
I0923 18:30:46.296826 56562 rdma_channel.cc:25] Destroying RDMAChannel with id: DataChannel
I0923 18:30:46.296864 56562 rdma_adapter.cc:12] RDMAAdapter is released
I0923 18:30:46.297307 56562 rdma_device.cc:60] RDMADevice(mlx5_0) is released
~/t/F/3/r/build (main)>

Updates

  • The initialization version is uploaded.

References

Belows are some useful references that may help you have a better understanding on RDMA