[mvapich-discuss] mixed stdout lines

[Jonathan L. Perkins]

Mark Potts wrote:
> 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,

We'll take a look into this behavior and see what can be done about it.

-- 
Jonathan Perkins
http://www.cse.ohio-state.edu/~perkinjo