Datatype::copy(recvbuf, count, datatype,sendtmpbuf, count, datatype);
/* inter-node allreduce */
if(MV2_Allreducection == &MPIR_Allreduce_pt2pt_rd_MV2){
Datatype::copy(recvbuf, count, datatype,sendtmpbuf, count, datatype);
/* inter-node allreduce */
if(MV2_Allreducection == &MPIR_Allreduce_pt2pt_rd_MV2){