[R] (correction) snowfall+Rmpi: sfExport error

[Mario Valle]

Sorry for wasting your time with an incorrect diagnosis in my previous mail!

I'm running my script using mpirun -mp 4 and using snowfall+Rmpi on
Linux 64bits. I receive the following error, that terminates the run.
Any idea?

I'm able to reproduce the problem with a minimal script (below).
If n < 16371 it completes 9 iterations without problems. Already at 
16371 it dies at iteration 7 (with the error below).

This value of n is suspiciously close to 2^14 (16kb). So maybe it is a 
configuration problem of my MPI installation. Or it is an undocumented 
limitation of snowfall/snow/Rmpi. My real variable size is around 
100000, so I prefer not to implement workarounds to sfExport variables 
whose size is < 16k.

If you can point me in the right direction will be really helpful.
Thanks!
		mario


TERM: Undefined variable.
TERM: Undefined variable.
TERM: Undefined variable.
TERM: Undefined variable.
Loading required package: utils
Loading required package: utils
Loading required package: utils
Loading required package: utils
Library Rmpi loaded.
snowfall 1.70 initialized: parallel execution on 3 CPUs.

Error in unserialize(obj) : unknown input format
Calls: sfExport ... mpi.recv.Robj -> .mpi.unserialize -> unserialize ->
.Call
Execution halted
MPI Application rank 0 exited before MPI_Finalize() with status 1
/users/mvalle/snow/snow/inst/RMPISNOW: line 40: 15028
Terminated              R --no-save $*
/users/mvalle/snow/snow/inst/RMPISNOW: line 40: 23906
Terminated              R --no-save $*
/users/mvalle/snow/snow/inst/RMPISNOW: line 40: 22094
Terminated              R --no-save $*


--- script ------------------------------------
library('Rmpi')
library('snowfall')

sfInit(parallel=TRUE, cpus=3, type="MPI")

for(i in 1:9) {

    n <- 20000
    logx <- runif(n, 0.02, 0.54)

    sfExport("logx")
}
sfStop()

-- 
Ing. Mario Valle
Data Analysis and Visualization Group            | 
http://www.cscs.ch/~mvalle
Swiss National Supercomputing Centre (CSCS)      | Tel:  +41 (91) 610.82.60
v. Cantonale Galleria 2, 6928 Manno, Switzerland | Fax:  +41 (91) 610.82.82

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