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Hello, I want to run MPI_Bcast collective communication based on mvapich2-2. 3. 7 version, using RoCE V2 and UD hardware multicast. Could you please let me know if the mvapich2/2. 3. 7 supports this? If it is supported, how should the environment
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<div style="line-height:1.7;color:#000000;font-size:14px;font-family:Arial"><p>Hello,</p><p>I want to run MPI_Bcast collective communication based on mvapich2-2.3.7 version, using RoCE V2 and UD hardware multicast. Could you please let me know if the mvapich2/2.3.7 supports this? If it is supported, how should the environment variable parameters be set?</p><p>NIC card is mlx5_0 and link_layer is Ethernet.</p><p>The relevant environment variables were set as follows:</p><p>MV2_USE_RDMA_CM_MCAST=1 </p><p>MV2_USE_MCAST=1</p><div>But it doesn't work properly,The error message reads as follows:</div><div><br></div><div>""</div><div>[work1:mpi_rank_0][mv2_mcast_process_comm_init_req] MCAST process Comm init failed comm_id:1383 retries :129</div><p>[work1:mpi_rank_0][mv2_mcast_remove_comm_init_req] End MCAST Comm init comm_id:1383</p><p><br></p><p>Can the environment variables MV2_USE_RDMA_CM=1 and MV2_USE_MCAST=1 、MV2_USE_RDMA_CM_MCAST=1,be used together? When running with these variables enabled simultaneously, the following error occurs：</p><p>[work4:mpi_rank_0][mv2_mcast_prepare_ud_ctx] MCAST UD QP creation failedFatal error in MPI_Init:</p><p>Other MPI error, error stack:</p><p>MPIR_Init_thread(493):</p><p>MPID_Init(419).......: channel initialization failed</p><p>MPIDI_CH3_Init(804)..: Error in create multicast UD context for multicast</p><p><br></p><p>[cli_0]: aborting job:</p><p>Fatal error in MPI_Init:</p><p>Other MPI error, error stack:</p><p>MPIR_Init_thread(493):</p><p>MPID_Init(419).......: channel initialization failed</p><p>MPIDI_CH3_Init(804)..: Error in create multicast UD context for multicast</p><p><br></p><p>[work4:mpispawn_0][mtpmi_processops] parse_str() failed with error code -105</p><p>""</p><p>Best regards </p></div><br>