[R-sig-hpc] Problem with the Rmpi package

[Hao Yu]

It is related to MPI_INITIALIZE and MPI_FINALIZE. Either one can only be
called once. Hence once detach() is used, R is no longer to be a MPI aware
process and cannot be a MPI process again.

Hao


Blanchette, Marco wrote:
> Dear all,
>
> I just started to use the snow package to send multiple jobs on our
> cluster using MPI and the Rpmi package as the communication method.
>
> However, the Rmpi package have been behaving strangely. When I try to
> detach the Rmpi package I get the following error message:
>
>> library(Rmpi)
>> detach()
> Error in dyn.unload(file.path(libpath, "libs", paste("Rmpi",
> .Platform$dynlib.ext,  :
>   dynamic/shared library
> '/Users/mab/Library/R/2.8/library/Rmpi/libs/Rmpi.so' was not loaded
>
> Following that error, the snow package seems to be unable to initiate a
> new cluster, whatever method is used. The fix is to kill  and restart my R
> session.
>
> Any suggestion as to what is the problem?
>
> --
> Marco Blanchette, Ph.D.
> Assistant Investigator
> Stowers Institute for Medical Research
> 1000 East 50th St.
>
> Kansas City, MO 64110
>
> Tel: 816-926-4071
> Cell: 816-726-8419
> Fax: 816-926-2018
>
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>


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