[mvapich-discuss] Buffering of STDOUT with MVAPICH.

[Pavel Shamis (Pasha)]

I think the mpiexec have some stdout redirections. Try to run the code 
with mpirun_rsh.

Peter Diener wrote:
> Hi,
> 
> I'm trying to debug a parallel code the old fashioned way by inserting
> print statements. However, it seems that STDOUT are buffered by MPI on all
> processors except processor 0. This happens even though we have a command
> line option to do unbuffered or line buffered output from the code. This
> makes it hard to figure out when and on which processor the problem 
> occurs.
> 
> Is it true that MVAPICH does this kind of buffering? And if so, is there a 
> way to turn it off?
> 
> I'm using MVAPICH version 0.9.8 on an opteron cluster with infiniband 
> interconnect.
> 
> The code is started with mpiexec.
> 
> Cheers,
> 
>   Peter
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> 


-- 
Pavel Shamis (Pasha)
Software Engineer
Mellanox Technologies LTD.
pasha at mellanox.co.il