[R] Running R under Mosix

B.Rowlingson@lancaster.ac.uk B.Rowlingson at lancaster.ac.uk
Thu May 3 16:28:01 CEST 2001

Luke Tierney wrote:

> Strange how these things go: we just had a discussion about this very
> issue among the R core group yesterday.

 Possibly because I brought it up on the Mosix list and the  
discussion migrated across? :)

> However, Thomas Lumley, who has been using R with Mosix, mentioned
> that there is a way you can tell Mosix that it is OK to migrate an R
> process even though it makes many of these system calls--I'm sure he
> can provide the details of how to do this.

 Yes, you can do 'mosrun -c R <args>', but you don't win. R still has
to make the system calls and they slow down the processing. Unless
got a spare Mosix node that is over twice as fast as your home node
Mosix will keep it on the home node (with my test job, anyway).

> In the longer term it is likely that we will make changes to the
> control flow in R that reduce the number of setjmp's and at the same
> time we can avoid saving the signal mask and just restore it when we
> know it has changed.

 Great. setjmp/longjmp do my head in.

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