[Pw_forum] Use -npool with ph.x?

[Miguel Martínez Canales]

Dear fellows,

I've been running some phonons calculations (Itanium 2, Linux, probably 
MPICH) and was amazed to see huge differences between serial espresso 3.1.1 
runs and parallel 3.2.1 runs. I've narrowed the search, though, and the 
problem seems to arise whenever I call ph.x with the "-npool" suffix. Is it 
stupid to run ph.x the following way?

mpirun -np 4 ph.x -npool 4 < inpnut > output

Note that this would be running on the same node, with 4 internal ia64 
chips. I also would like to note that pw.x seems to run OK.

Thanks in advance,

Miguel


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Miguel Martínez Canales
    Dto. Física de la Materia Condensada
    UPV/EHU
    Facultad de Ciencia y Tecnología
    Apdo. 644
    48080 Bilbao (Spain)
Fax:  +34 94 601 3500
Tlf:  +34 94 601 5437
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