Hi,
On Linux with R 3.5.1 and OpenMPI 2.1.0 I have built Rmpi and can run a
simple example just using Rmpi and printing out the rank of each worker.
However, when I try to use doMPI by running the following
library(Rmpi)
library(doMPI)
cl <- startMPIcluster(count=2)
registerDoMPI(cl)
clusterSize(cl)
closeCluster(cl)
mpi.quit()
with
mpirun -np 1 --mca mpi_warn_on_fork 0 R --no-save -f mwe.r
I get the following output
> library("Rmpi")
> library(doMPI)
Loading required package: foreach
Loading required package: iterators
> cl <- startMPIcluster(count=2)
2 slaves are spawned successfully. 0 failed.
> registerDoMPI(cl)
> clusterSize(cl)
[1] 2
> closeCluster(cl)
but the program hangs and I have to end it with Ctl-C.
Can anyone shed any light on what might be wrong?
Cheers,
Loris
--
Dr. Loris Bennett (Mr.)
ZEDAT, Freie Universit?t Berlin Email loris.bennett at fu-berlin.de
Loris Bennett <loris.bennett at fu-berlin.de> writes:> Hi, > > On Linux with R 3.5.1 and OpenMPI 2.1.0 I have built Rmpi and can run a > simple example just using Rmpi and printing out the rank of each worker. > > However, when I try to use doMPI by running the following > > library(Rmpi) > library(doMPI) > cl <- startMPIcluster(count=2) > registerDoMPI(cl) > clusterSize(cl) > closeCluster(cl) > mpi.quit() > > with > > mpirun -np 1 --mca mpi_warn_on_fork 0 R --no-save -f mwe.r > > I get the following output > > > library("Rmpi") > > library(doMPI) > Loading required package: foreach > Loading required package: iterators > > cl <- startMPIcluster(count=2) > 2 slaves are spawned successfully. 0 failed. > > registerDoMPI(cl) > > clusterSize(cl) > [1] 2 > > closeCluster(cl) > > but the program hangs and I have to end it with Ctl-C. > > Can anyone shed any light on what might be wrong?Having come across the following link: https://www.sharcnet.ca/help/index.php/Using_R_and_MPI I rebuilt with OpenMPI 1.8.6 and the problem disappeared. Cheers, Loris -- This signature is currently under construction.