[R] R <--> JVM

[R. Michael Weylandt]

On Fri, Jun 15, 2012 at 11:03 AM,  <ANGELO.LINARDI at bancaditalia.it> wrote:
> Hello,
>
> first of all thanks to both of you for your fast response.
> Going back to Michael's wonderful ASCII art masterpiece, what we have now is something like this:
>
> -------  JVM -----------
>
>   ----  JAVA  ----
>
>          JDBC
>               |
>               |
>        Algorithm
>               |
>    ---- JAVA ----
> -------  JVM -----------
>              |
>           RNI
>              |
>             R
>
> What we want is something like the following (on the same virtual machine):
>
> -------  JVM1 -----------                       -------  JVM2 -----------
>
>   ----  JAVA  ----                             ----  JAVA  ----
>
>          JDBC                                          JDBC
>               |                                                |
>               |                                                |
>        Algorithm                                       Algorithm
>               |                                                |
>    ---- JAVA ----                              ---- JAVA ----
> -------  JVM1 -----------                       -------  JVM2 -----------
>              |                                         |
>           RNI                                       RNI
>              |                                         |
>             R(1)                                               R(2)
>
> My question is: is that possible ? How can I address R(1) from JVM1 and R(2) from JVM2 ? Is data calculated in R(1) and R(2) completely independent or the 2 instances "share" something in memory ?

Best I understand it (and RNI seems Windows-only so I can't verify)
you have nothing to worry about. As long as you start 2 R processes
(which seems to be the only thing that could happen with two JVMs) the
memory should be kept independently. The only exception I can think of
is that if you choose to install a new package on one R process it
might be available to the other as a read-only resource (but I'm not
sure even this would happen depending on how your VM handles that bit)
but data integrity should be guaranteed.

Michael

> Thanks again for you kindness and help.
>
> Angelo
>
> -----Messaggio originale-----
> Da: Oliver Ruebenacker [mailto:curoli at gmail.com]
> Inviato: venerdì 15 giugno 2012 17.36
> A: R. Michael Weylandt
> Cc: LINARDI ANGELO; r-help at r-project.org
> Oggetto: Re: [R] R: Securities earning covariance
>
>
>     Hello,
>
> On Fri, Jun 15, 2012 at 10:15 AM, R. Michael Weylandt
> <michael.weylandt at gmail.com> wrote:
>> ii) There does not exist -- to my knowledge -- an implementation of R
>> which runs on the JVM.
>
>  I think he means driving the R framework from Java via JNI. I think
> the questions boils down to whether you can open multiple independent
> R sessions on the same system and then address them separately via JNI
> (I don't know, but I would assume you can do that without multiplying
> the installation).
>
>     Take care
>     Oliver
>
> --
> Oliver Ruebenacker
> Bioinformatics Consultant (http://www.knowomics.com/wiki/Oliver_Ruebenacker)
> Knowomics, The Bioinformatics Network (http://www.knowomics.com)
> SBPAX: Turning Bio Knowledge into Math Models (http://www.sbpax.org)
>
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