[mvapich-discuss] mixed stdout lines

[Mark Potts]

Hi,
    We observe that when large numbers of MVAPICH processes
    (1000+) send even small bits to stdout, the output from the
    various processes gets commingled.  That is, we observe that
    even "Hello World from rank=NN" lines from various ranks result
    in many overlapping lines, dropped characters, etc to the
    screen when output directly from the mpirun_rsh process in a
    large job.  If the mpirun_rsh output is piped through "tee"
    into a file, all output lines are available in perfect order in
    that file.  So this is not a loss of print data between children
    and parent, but rather a parent-centric problem.  Since "tee"
    can not always be used, is there something that you/we can change
    to prevent this garbled stdout data?

           regards,
-- 
***********************************
 >> Mark J. Potts, PhD
 >>
 >> HPC Applications Inc.
 >> phone: 410-992-8360 Bus
 >>        410-313-9318 Home
 >>        443-418-4375 Cell
 >> email: potts at hpcapplications.com
 >>        potts at excray.com
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