Yes. I believe your i5 machine has least two cores. So it is indeed a parallel machine. You should observe some speedup when you run program with two MPI processes. 

--Junchao Zhang

On Tue, Mar 3, 2015 at 5:44 AM, Chafik sanaa <san.chafik@gmail.com> wrote:

I use the MPICH2 to parallelize my algorithm on an i5 machine, is the time calculated in this type of machinery is the time actually consumed or estimated in my programe? I ask this question because someone told me that if you do not work on a parallel machine then even if you calculate the execution time in your parallel algorithm and you compare it with the algorithm that you do not use parallelism is not correct.effectively I tried to compare the execution time of both programs but really I find that there's a accelerartion when I use the parallelism

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