[mpich-discuss] Does MPICH implements polling mechanism on MPI_Recv?

Dear MPICH forum. I created an endless MPI program. In this program each process calls MPI_Recv from other process, w/o any MPI _Send. When I execute this program I see each process takes ~ 100% CPU core. Is this behavior (I suppose polling) is normal? May I reduce MPI_Recv CPU penalty? Regards, Anatoly.