有没有一种方法使用MPI让产生的进程与MPI_WORLD中的所有其他参与者进行通信,而不仅仅与产生该进程的父进程通信?可以产生一个进程与“主”MPI通信器通信
现在我有两个主要剂,所谓的主设备和从该运行下面的代码(spawn.py):
# Spawn test: master and first slave
import sys
from mpi4py import MPI
comm = MPI.COMM_WORLD
rank = comm.Get_rank()
if rank == 0 : # master code
print "i am the master on rank %i" % (rank)
running = True
while running :
msg = comm.recv(source=MPI.ANY_SOURCE,tag=0)
print "master received message: ", msg
if msg == "Done" :
running = False
print "master is done"
if rank == 1 : # slave code
no_spawn = 1
print "I am a slave on rank %i, about the spawn lower slaves" % (rank)
icomm = MPI.COMM_SELF.Spawn(sys.executable,args=["Cpi.py","ben"],maxprocs=no_spawn)
comm.send("Test_comm",dest=0,tag=0)
icomm.send("Test_icomm",dest=0,tag=0)
isize = icomm.Get_size()
print "on slave, isize= %i" % (isize)
rec = 0
while rec <= (no_spawn-1) :
msg = icomm.recv(source=MPI.ANY_SOURCE,tag=20)
print "slave received message: %s (rec=%i)" % (msg, rec)
rec = rec +1
import time
print "slave going to sleep\n"
time.sleep(1)
for i in range(no_spawn) :
message = ("To spawn from slave",)
icomm.send(message,dest=i,tag=0)
for i in range(no_spawn) :
message = ("Done",)
icomm.send(message,dest=i,tag=0)
msg = comm.recv(source=MPI.ANY_SOURCE,tag=0)
print "slave received message: ", msg
comm.send("Done",dest=0,tag=0)
MPI.Finalize()
从属,反过来,产卵1个运行如下多个进程代码(CPi.py,所述mpi4py教程文件命名):
#!/usr/bin/env python
import sys
from mpi4py import MPI
comm = MPI.COMM_WORLD
icomm = MPI.Comm.Get_parent()
irank = icomm.Get_rank()
print "Spawn irank=%i" % (irank)
message = "From_Spawn_%i"%(irank)
icomm.send(message,dest=0,tag=20)
running = True
while running :
msg = icomm.recv(source=MPI.ANY_SOURCE,tag=0)
print "Spawn on irank %i received message: %s " %(irank,msg)
if msg[0] == "Done" :
running = False
print "spawn %i sending a last msg to the master and the slave" % (irank)
comm.send(("To master from spawn",), dest=0,tag=0)
comm.send(("To slave from spawn",), dest=0,tag=0)
主设备和从我可以通过使用comm
通信发送消息之间。在奴隶和产生的过程之间,我可以通过icomm
通信器发送消息。但我真正想要的是产生一个进程,并且这个进程可以通过comm
通信器与主设备和从设备进行通信;看到产生的过程的最后两行。那可能吗?并且产生的过程是否有可能听从奴隶和主人使用的主要comm
?它将被发送到/听哪个级别?
提供的代码不会终止,因为生成的进程发送的最后两条消息不会被从属设备或主设备接收。 (我使用mpiexec -n 2 python spawn.py
运行代码)
从你的其他合并命令[post](http://stackoverflow.com/questions/9970409/mpi-spawn-root-process-does-not-communicate-to-child-processes)不会做?我可以重写代码并初始化1个主,n个从属和n个spawnees,但为了提高效率,spawnees和slave在同一个处理器上似乎很重要。我试过1.函数调用2.线程,3. MPI.Spawn。 1和2我不能动态地安排从属和spawnees之间的通信。使用3.我可以在slave和spawnee之间进行通信,但不能在slave之间同时进行通信:icomm.recv或comm.recv – user989762
您无法通过合并来完成此操作。它不合并两个传播者,只是一个互通者。 –