[Beowulf] MPICH question

John Lau cflau at clustertech.com
Mon Feb 21 17:30:29 PST 2005


I have a question on the number of processes spawned by MPICH. I am
using MPICH --with-device=ch_p4. When I use mpirun -np 4 to
start a mpi process, total 8 processes will be spawned. But only 4
processes have loadings on CPUs. I would like to know if it is the
correct behavior of MPICH? And what's the use of the 4 no-loading
process? Thank you.

Best regards,
John Lau
John Lau Chi Fai
Cluster Technology Ltd.
cflau at clustertech.com
Tel: (852) 2994-3727
Fax: (852) 2994-2101

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