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Subject: [OMPI users] random IB failures when running medium core counts
From: Brock Palen (brockp_at_[hidden])
Date: 2010-08-30 12:22:19

We recently installed a modest IB network to our cluster,
When running a 1884 core IB HPL job after a run we will get an error about IB, it does not always happen in the same place, some iterations will pass others will fail the error is below, we are using openmpi/1.4.2 with the intel 11 compilers.
Note that 1000 core jobs and other sizes work well also but this larger one does not. Thanks!

[[62713,1],1867][btl_openib_component.c:3224:handle_wc] from to: nyx5120 error polling LP CQ with status RETRY EXCEEDED ERROR status number 12 for wr_id 413569408 opcode 11112 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 10). 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:
  Local device: mlx4_0
  Peer host: nyx5120

You may need to consult with your system administrator to get this
problem fixed.
mpirun has exited due to process rank 1867 with PID 3474 on
node nyx5011 exiting without calling "finalize". This may
have caused other processes in the application to be
terminated by signals sent by mpirun (as reported here).
[nyx5049:07901] *** Process received signal ***
[nyx5049:07901] Signal: Aborted (6)
[nyx5049:07901] Signal code: (-6)
[nyx5049:07901] [ 0] /lib64/ [0x2b5dcbc70b10]
[nyx5049:07901] [ 1] /lib64/ [0x2b5dcbeae265]
[nyx5049:07901] [ 2] /lib64/ [0x2b5dcbeafd10]
[nyx5049:07901] [ 3] /home/software/rhel5/openmpi-1.4.2/intel-11.0/lib/ [0x2b5dcacdb7e6]
[nyx5049:07901] [ 4] /home/software/rhel5/openmpi-1.4.2/intel-11.0/lib/ [0x2b5dcaf3a9aa]
[nyx5049:07901] [ 5] /home/software/rhel5/openmpi-1.4.2/intel-11.0/lib/ [0x2b5dcaf2d26e]
[nyx5049:07901] [ 6] /home/software/rhel5/openmpi-1.4.2/intel-11.0/lib/openmpi/ [0x2b5dcce37e5c]
[nyx5049:07901] [ 7] /home/software/rhel5/openmpi-1.4.2/intel-11.0/lib/ [0x2b5dcacdb97e]
[nyx5049:07901] [ 8] /home/software/rhel5/openmpi-1.4.2/intel-11.0/lib/ [0x2b5dcaf3a9aa]
[nyx5049:07901] [ 9] /home/software/rhel5/openmpi-1.4.2/intel-11.0/lib/ [0x2b5dcaf2d26e]
[nyx5049:07901] [10] /home/software/rhel5/openmpi-1.4.2/intel-11.0/lib/openmpi/ [0x2b5dcce37e5c]
[nyx5049:07901] [11] /home/software/rhel5/openmpi-1.4.2/intel-11.0/lib/ [0x2b5dcacdb97e]
[nyx5049:07901] [12] /home/software/rhel5/openmpi-1.4.2/intel-11.0/lib/ [0x2b5dcaf3a9aa]
[nyx5049:07901] [13] /home/software/rhel5/openmpi-1.4.2/intel-11.0/lib/ [0x2b5dcaf3a6d8]
[nyx5049:07901] [14] /home/software/rhel5/openmpi-1.4.2/intel-11.0/lib/ [0x2b5dcacdb15f]
[nyx5049:07901] [15] orted [0x401ad6]
[nyx5049:07901] [16] /lib64/ [0x2b5dcbe9b994]
[nyx5049:07901] [17] orted [0x401999]
[nyx5049:07901] *** End of error message ***

Brock Palen
Center for Advanced Computing