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Subject: [OMPI users] problem with rankfile
From: Siegmar Gross (Siegmar.Gross_at_[hidden])
Date: 2012-09-03 15:43:56


Hi,

the man page for "mpiexec" shows the following:

         cat myrankfile
         rank 0=aa slot=1:0-2
         rank 1=bb slot=0:0,1
         rank 2=cc slot=1-2
         mpirun -H aa,bb,cc,dd -rf myrankfile ./a.out So that

       Rank 0 runs on node aa, bound to socket 1, cores 0-2.
       Rank 1 runs on node bb, bound to socket 0, cores 0 and 1.
       Rank 2 runs on node cc, bound to cores 1 and 2.

Does it mean that the process with rank 0 should be bound to
core 0, 1, or 2 of socket 1?

I tried to use a rankfile and have a problem. My rankfile contains
the following lines.

rank 0=tyr.informatik.hs-fulda.de slot=0:0
rank 1=tyr.informatik.hs-fulda.de slot=1:0
#rank 2=rs0.informatik.hs-fulda.de slot=0:0

Everything is fine if I use the file with just my local machine
(the first two lines).

tyr small_prog 115 mpiexec -report-bindings -rf my_rankfile rank_size
[tyr.informatik.hs-fulda.de:01133] [[9849,0],0]
  odls:default:fork binding child [[9849,1],0] to slot_list 0:0
[tyr.informatik.hs-fulda.de:01133] [[9849,0],0]
  odls:default:fork binding child [[9849,1],1] to slot_list 1:0
I'm process 0 of 2 available processes running on tyr.informatik.hs-fulda.de.
MPI standard 2.1 is supported.
I'm process 1 of 2 available processes running on tyr.informatik.hs-fulda.de.
MPI standard 2.1 is supported.
tyr small_prog 116

I can also change the socket number and the processes will be attached
to the correct cores. Unfortunately it doesn't work if I add one
other machine (third line).

tyr small_prog 112 mpiexec -report-bindings -rf my_rankfile rank_size
--------------------------------------------------------------------------
We were unable to successfully process/set the requested processor
affinity settings:

Specified slot list: 0:0
Error: Cross-device link

This could mean that a non-existent processor was specified, or
that the specification had improper syntax.
--------------------------------------------------------------------------
[tyr.informatik.hs-fulda.de:01520] [[10212,0],0]
  odls:default:fork binding child [[10212,1],0] to slot_list 0:0
[tyr.informatik.hs-fulda.de:01520] [[10212,0],0]
  odls:default:fork binding child [[10212,1],1] to slot_list 1:0
[rs0.informatik.hs-fulda.de:12047] [[10212,0],1]
  odls:default:fork binding child [[10212,1],2] to slot_list 0:0
[tyr.informatik.hs-fulda.de:01520] [[10212,0],0]
  ORTE_ERROR_LOG: A message is attempting to be sent to a process
  whose contact information is unknown in file
  ../../../../../openmpi-1.6/orte/mca/rml/oob/rml_oob_send.c at line 145
[tyr.informatik.hs-fulda.de:01520] [[10212,0],0] attempted to send
  to [[10212,1],0]: tag 20
[tyr.informatik.hs-fulda.de:01520] [[10212,0],0] ORTE_ERROR_LOG:
  A message is attempting to be sent to a process whose contact
  information is unknown in file
  ../../../../openmpi-1.6/orte/mca/odls/base/odls_base_default_fns.c
  at line 2501
--------------------------------------------------------------------------
mpiexec was unable to start the specified application as it
  encountered an error:

Error name: Error 0
Node: rs0.informatik.hs-fulda.de

when attempting to start process rank 2.
--------------------------------------------------------------------------
tyr small_prog 113

The other machine has two 8 core processors.

tyr small_prog 121 ssh rs0 psrinfo -v
Status of virtual processor 0 as of: 09/03/2012 19:51:15
  on-line since 07/26/2012 15:03:14.
  The sparcv9 processor operates at 2400 MHz,
        and has a sparcv9 floating point processor.
Status of virtual processor 1 as of: 09/03/2012 19:51:15
...
Status of virtual processor 15 as of: 09/03/2012 19:51:15
  on-line since 07/26/2012 15:03:16.
  The sparcv9 processor operates at 2400 MHz,
        and has a sparcv9 floating point processor.
tyr small_prog 122

Is it necessary to specify another option on the command line or
is my rankfile faulty? Thank you very much for any suggestions in
advance.

Kind regards

Siegmar