Karl,
I have the following notes to self that may be pertinent:
options(java.parameters=
## Must preceed `library(XLConnect)` in order to prevent "Java
## requested System.exit(130), closing R." which happens when
## rJava quits R upon trapping INT (control-c), as is done by
## XLConnect (and playwith?), below. (c.f.:
## https://www.rforge.net/bugzilla/show_bug.cgi?id=237)
"-Xrs")
~Malcolm
>-----Original Message-----
>From: r-devel-boun...@r-project.org [mailto:r-devel-boun...@r-project.org] On
>Behalf Of Karl Forner
>Sent: Monday, November 11, 2013 11:41 AM
>To: r-devel@r-project.org
>Cc: Martin Studer
>Subject: [Rd] problem using rJava with parallel::mclapply
>
>Dear all,
>
>I got an issue trying to parse excel files in parallel using XLConnect, the
>process hangs forever.
>Martin Studer, the maintainer of XLConnect kindly investigated the issue,
>identified rJava as a possible cause of the problem:
>
>This does not work (hangs):
>library(parallel)
>require(rJava)
>.jinit()
>res <- mclapply(1:2, function(i) {
> J("java.lang.Runtime")$getRuntime()$gc()
> 1
> }, mc.cores = 2)
>
>but this works:
>library(parallel)
>res <- mclapply(1:2, function(i) {
> require(rJava)
> .jinit()
> J("java.lang.Runtime")$getRuntime()$gc()
> 1
>}, mc.cores = 2)
>
>To cite Martin, it seems to work with mclapply when the JVM process is
>initialized after forking.
>
>Is this a bug or a limitation of rJava ?
>Or is there a good practice for rJava clients to avoid this problem ?
>
>Best,
>Karl
>
>P.S.
>> sessionInfo()
>R version 3.0.1 (2013-05-16)
>Platform: x86_64-unknown-linux-gnu (64-bit)
>
>locale:
> [1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C
> [3] LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8
> [5] LC_MONETARY=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8
> [7] LC_PAPER=C LC_NAME=C
> [9] LC_ADDRESS=C LC_TELEPHONE=C
>[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C
>
>attached base packages:
>[1] stats graphics grDevices utils datasets methods base
>
>loaded via a namespace (and not attached):
>[1] tools_3.0.1
>
> [[alternative HTML version deleted]]
>
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