我如何让mpi4py在Pycharm中工作并打印正确的结果？

Question

这是我的代码：

from mpi4py import MPI
comm = MPI.COMM_WORLD

world_size = comm.Get_size()
world_rank = comm.Get_rank()
processor_name = MPI.Get_processor_name()

print("MPI Hello World Program")
print("Processor Name:", processor_name)
print("Processor Rank:", world_rank)
print("World Size:", world_size)

MPI.Finalize()

我的输出是：

MPI Hello World Program
Processor Name: joshua
Processor Rank: 0
World Size: 1

如果我没记错，（如果我记错了，请纠正我）此程序打印的次数不应与计算机的内核数相同吗？我的macbook pro有2个核心，当我尝试在终端中执行此程序时，出现如下错误：

Fatal error in MPI_Init_thread: Other MPI error, error stack:
MPIR_Init_thread(565)..............: 
MPID_Init(224).....................: channel initialization failed
MPIDI_CH3_Init(105)................: 
MPID_nem_init(324).................: 
MPID_nem_tcp_init(178).............: 
MPID_nem_tcp_get_business_card(425): 
MPID_nem_tcp_init(384).............: gethostbyname failed, joshua (errno 1)

关于为什么它不起作用的任何想法？