Well, OMPI will see this as a 14 separate devices and will create ~28 openib btl instances (one per each port). Can you try to limit OpenMPI to run with a single device/port and see what happens ?
Best, Pasha From: users <users-boun...@open-mpi.org<mailto:users-boun...@open-mpi.org>> on behalf of John Marshall <john.marsh...@ssc-spc.gc.ca<mailto:john.marsh...@ssc-spc.gc.ca>> Reply-To: Open Users <us...@open-mpi.org<mailto:us...@open-mpi.org>> List-Post: users@lists.open-mpi.org Date: Friday, October 16, 2015 2:16 PM To: Open Users <us...@open-mpi.org<mailto:us...@open-mpi.org>> Subject: Re: [OMPI users] openib issue with 1.6.5 but not later releases On 10/16/2015 01:35 PM, Shamis, Pavel wrote: Did you try to run ibdiagnet to check the network ? Also, how many devices you have on the same node ? It say "mlx4_14" - do you have 14 HCA on the same machine ?! Yes. ibdiagnet seems to check out fine except for a few warning which do not seem to be consequential (e.g., more recent firmware available). There is a single card with two ports but many interfaces (16/port, but we are using only 1 port). We are using SRIOV. John Best, Pavel (Pasha) Shamis --- Computer Science Research Group Computer Science and Math Division Oak Ridge National Laboratory On Oct 16, 2015, at 10:26 AM, John Marshall <john.marsh...@ssc-spc.gc.ca<mailto:john.marsh...@ssc-spc.gc.ca>> wrote: Hi, I have encountered a problem when running with 1.6.5 over IB (openib, ConnectX-3): [[51298,1],2][btl_openib_component.c:3496:handle_wc] from ib7-bc2qq42-be01p02 to: 3 error polling LP CQ with status RETRY EXCEEDED ERROR status number 12 for wr_id 217ce00 opcode 0 vendor error 129 qp_idx 0 -------------------------------------------------------------------------- The InfiniBand retry count between two MPI processes has been exceeded. "Retry count" is defined in the InfiniBand spec 1.2 (section 12.7.38): The total number of times that the sender wishes the receiver to retry timeout, packet sequence, etc. errors before posting a completion error. This error typically means that there is something awry within the InfiniBand fabric itself. You should note the hosts on which this error has occurred; it has been observed that rebooting or removing a particular host from the job can sometimes resolve this issue. Two MCA parameters can be used to control Open MPI's behavior with respect to the retry count: * btl_openib_ib_retry_count - The number of times the sender will attempt to retry (defaulted to 7, the maximum value). * btl_openib_ib_timeout - The local ACK timeout parameter (defaulted to 20). The actual timeout value used is calculated as: 4.096 microseconds * (2^btl_openib_ib_timeout) See the InfiniBand spec 1.2 (section 12.7.34) for more details. Below is some information about the host that raised the error and the peer to which it was connected: Local host: ib7-bc2qq42-be01p02 Local device: mlx4_14 Peer host: 3 You may need to consult with your system administrator to get this problem fixed. -------------------------------------------------------------------------- [[51298,1],0][btl_openib_component.c:3496:handle_wc] from ib7-bc2qq42-be02p02 to: 1 error polling LP CQ with status RETRY EXCEEDED ERROR status number 12 for wr_id 15a4e00 opcode 10979 vendor error 129 qp_idx 0 -------------------------------------------------------------------------- mpirun has exited due to process rank 2 with PID 534 on node 2 exiting improperly. There are two reasons this could occur: 1. this process did not call "init" before exiting, but others in the job did. This can cause a job to hang indefinitely while it waits for all processes to call "init". By rule, if one process calls "init", then ALL processes must call "init" prior to termination. 2. this process called "init", but exited without calling "finalize". By rule, all processes that call "init" MUST call "finalize" prior to exiting or it will be considered an "abnormal termination" This may have caused other processes in the application to be terminated by signals sent by mpirun (as reported here). -------------------------------------------------------------------------- [ib7-bc2qq42-be02p02:01438] 1 more process has sent help message help-mpi-btl-openib.txt / pp retry exceeded * We are using logical names for our targets (which explains Peer host: 3 above). This is reproducible with a simple program which does send+recv around a ring and calls barrier before each iteration. The problem occurs at the barrier. When I search for details on what this problem is, all I can find are suggestions that this is hardware (cabling) related. Our network guys have checked and everything appears to be set up correctly. But, when I run the same program build with 1.8.8 and 1.10.0 on the same system, the problem does not occur (at least for the parameters I am using). Also, when running with 1.6.5 using IB on another system (openib, ConnectX ), I do _not_ encounter the problem. Does anyone have some insight into what might be going on? Should I really be looking more into the hardware? I could begin migrating to >1.6.5, but I am concerned that the problem would just pop up somewhere else. Thanks, John _______________________________________________ users mailing list us...@open-mpi.org<mailto:us...@open-mpi.org> Subscription: http://www.open-mpi.org/mailman/listinfo.cgi/users Link to this post: http://www.open-mpi.org/community/lists/users/2015/10/27881.php _______________________________________________ users mailing list us...@open-mpi.org<mailto:us...@open-mpi.org> Subscription: http://www.open-mpi.org/mailman/listinfo.cgi/users Link to this post: http://www.open-mpi.org/community/lists/users/2015/10/27882.php
