Plain: Problem with Rmpi
Why are you calling mpi.close.Rslaves? I believe that you should only do that if you've started the slaves via mpi.spawn.Rslaves. I'm not sure if that has any bearing on your problem, however. But I wouldn't draw too many conclusions based on not seeing messages to stdout from the slaves right before quitting, especially messages that are produced on different machines. To improve the chances of it working, I suggest that you add a call to flush(stdout()) after the cat. But you might want to do something else to prove whether the slaves are really running. - Steve
On Mon, Jan 18, 2010 at 8:42 AM, <sebastian.rohrer at basf.com> wrote:
Dear List, I have the following problem with R (2.10.0) Rmpi using OpenMPI 1.3.3.: I use Dirk Eddelbuettels test script for testing if Rmpi works. (http://dirk.eddelbuettel.com/papers/ismNov2009introHPCwithR.pdf, the example is on Slide 96) The script looks as follows: require(Rmpi) rk <- mpi.comm.rank(0) sz <- mpi.comm.size(0) name <- mpi.get.processor.name() cat("Hello, rank", rk, "size", sz, "on", name, "\n") mpi.close.Rslaves() mpi.quit() According to Dirk's slides, the output should look something like: Hello, rank 4 size 8 on ron Hello, rank 0 size 8 on ron Hello, rank 3 size 8 on mccoy Hello, rank 7 size 8 on mccoy Hello, rank Hello, rank 21 size 8 on joe size 8 on tony Hello, rank 6 size 8 on tony Hello, rank 5 size 8 on joe I call the script: /programs/openmpi-1.3.3/bin/orterun -host node02,node03 -n 4 /programs/R/R-2.10.0/bin/Rscript mpiTest_03.R The output looks like: master (rank 0, comm 1) of size 4 is running on: node02 slave1 (rank 1, comm 1) of size 4 is running on: node03 slave2 (rank 2, comm 1) of size 4 is running on: node02 slave3 (rank 3, comm 1) of size 4 is running on: node03 Hello, rank 0 size 4 on node02 So, in my understanding there is a master and 3 slaves are spawned. But the call for the processor name is executed only on the master. Right? Any suggestions on what could be the problem? Thanks a lot! Sebastian ? ? ? ?[[alternative HTML version deleted]]
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