about MPI_Comm_size(PETSC_COMM_WORLD,&size)

Matthew Knepley knepley at gmail.com
Wed Oct 25 20:47:00 CDT 2006

On 10/25/06, Yixun Liu <yxliu at fudan.edu.cn> wrote:
>  Hi,
> My computer is a standare dual processors PC of Dell corp., but after
> calling   ierr = PI_Comm_size(PETSC_COMM_WORLD,&size), I find the size is
> one. Is it correct?

MPI only knows what mpiruns tells it. You ran the exampe with -np 1. If you
use -np 2, then it will have size 2.


> Yixun
"Failure has a thousand explanations. Success doesn't need one" -- Sir Alec
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