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在 R/snowfall 中，使用“MPI”类型初始化集群时，会显示错误消息。任何人都可以帮忙吗？谢谢！

library(snowfall)
library(Rmpi)
sfInit(parallel=TRUE,cpus=3,type='MPI')
sfStop()

运行时sfInit(parallel=TRUE,cpus=3,type='MPI')，出现如下错误信息：

Library Rmpi loaded.
Error in Rmpi::mpi.comm.spawn(slave = mpitask, slavearg = args, nslaves = count,  : 
  Internal MPI error!, error stack:
MPI_Comm_spawn(cmd="/usr/bin/env", argv=0x0000029F97E7E448, maxprocs=3, MPI_INFO_NULL, root=0, MPI_COMM_SELF, intercomm=0x0000029FF870FCF8, errors=0x0000029FF6B92140) failed
Internal MPI error!  FAILspawn not supported without process manager
Error in sfInit(parallel = TRUE, cpus = 3, type = "MPI") : 
  Starting of snow cluster failed! Error in Rmpi::mpi.comm.spawn(slave = mpitask, slavearg = args, nslaves = count,  : 
  Internal MPI error!, error stack:
MPI_Comm_spawn(cmd="/usr/bin/env", argv=0x0000029F97E7E448, maxprocs=3, MPI_INFO_NULL, root=0, MPI_COMM_SELF, intercomm=0x0000029FF870FCF8, errors=0x0000029FF6B92140) failed
Internal MPI error!  FAILspawn not supported without process manager
 Error in Rmpi::mpi.comm.spawn(slave = mpitask, slavearg = args, nslaves = count,  : 
  Internal MPI error!, error stack:
MPI_Comm_spawn(cmd="/usr/bin/env", argv=0x0000029F97E7E448, maxprocs=3, MPI_INFO_NULL, root=0, MPI_COMM_SELF, intercomm=0x0000029FF870FCF8, errors=0x0000029FF6B92140) failed
Internal MPI error!  FAILspawn not supported without process manager
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