[Beowulf] mpich buffering problem?

[knomura123]

I have a cluster running with Fedra Core2 + Opteron, and I recently
installed MPICH-1.2.6 + PathScale2.0. 

I'm having a problem of output from MPI job. If I redirect standard output
into a file like

mpirun -np 8 a.out > log

I won't be able to see the output data until the amount of output data
reaches 4096 bytes.

I want to check my result in real time, but I have to wait due to the
buffering. 

The same problem happens when I save the output into files.  

I ran my code only using fileserver remove NFS effect, but it still
happened. 

Does anyone have any idea?

 

Ken

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