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Subject: [OMPI users] openib issues
From: Eloi Gaudry (eg_at_[hidden])
Date: 2010-07-19 10:38:57


I've been working on a random segmentation fault that seems to occur during a collective communication when using the openib btl (see [OMPI users] [openib] segfault when using openib btl).

During my tests, I've come across different issues reported by OpenMPI-1.4.2:

[[12770,1],0][btl_openib_component.c:3227:handle_wc] from bn0103 to: bn0122 error polling LP CQ with status LOCAL LENGTH ERROR status number 1 for wr_id 560618664 opcode 1 vendor error 105 qp_idx 3

[[992,1],6][btl_openib_component.c:3227:handle_wc] from pbn04 to: pbn05 error polling LP CQ with status REMOTE ACCESS ERROR status number 10 for wr_id 162858496 opcode 1 vendor error 136 qp_idx
0[[992,1],5][btl_openib_component.c:3227:handle_wc] from pbn05 to: pbn04 error polling HP CQ with status WORK REQUEST FLUSHED ERROR status number 5 for wr_id 485900928 opcode 0 vendor error 249
qp_idx 0
The OpenFabrics stack has reported a network error event. Open MPI will try to continue, but your job may end up failing.
  Local host: p'"
  MPI process PID: 20743
  Error number: 3 (IBV_EVENT_QP_ACCESS_ERR)
This error may indicate connectivity problems within the fabric; please contact your system administrator.

I'd like to know what these two errors mean and where they come from.

Thanks for your help,

Eloi Gaudry
Free Field Technologies
Company Website:
Company Phone:   +32 10 487 959