[R] Re: [openMosix-general] openMosix and R: File I/O issues?

[James Thomas]

Thanks for the response.  Are there any documented reasons as to why oM "dislikes" I/O?  Our network hardware works fine with SNOW and rMPI, so our problem must lie somewhere within the mosix framework.

Jim

---- "(A.J. Rossini)" <rossini at blindglobe.net> wrote:
>
> 
> Other than OpenMOSIX disliking I/O, I havn't seen any problems.  I
> would suspect network hardware and drivers -- while generally robust, cluster
> computations stress it much more than daily use, with less tolerance
> for problems.
> 
> best,
> -tony
> 
> 
> Jim Thomas <james at staarfunds.com> writes:
> 
> > Hi there,
> >
> > We're attempting to run an LVQ analysis over a cluster of machines via
> > R and openMosix.  R spawns several child processes simply by writing
> > commands to several files and using system() to start a slave
> > process. The processes migrate perfectly, and often finish with no
> > reported errors, writing their results into respective files for the
> > parent process to piece together.  However, occasionally we have had
> > the problem that the results from a child process never make it into a
> > file. The process finishes, and exits, with no errors - but the file
> > never turns up.  Repeated tests with the same data have shown that the
> > specific process that dies is random, and stress tests of R I/O have
> > shown that there are no issues there.  Does anyone know of I/O issues
> > with openMosix, either specifically related to R or not?
> >
> > using:
> > openMosix kernel 2.4.21
> > R 1.8.1
> > RedHat Enterprise Edition
> >
> > Thanks,
> > Jim
> >
> >
> >
> > -------------------------------------------------------
> > This SF.Net email is sponsored by: IBM Linux Tutorials
> > Free Linux tutorial presented by Daniel Robbins, President and CEO of
> > GenToo technologies. Learn everything from fundamentals to system
> > administration.http://ads.osdn.com/?ad_id=1470&alloc_id=3638&op=click
> > _______________________________________________
> > openMosix-general mailing list
> > openMosix-general at lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/openmosix-general
> >
> 
> -- 
> rossini at u.washington.edu            http://www.analytics.washington.edu/ 
> Biomedical and Health Informatics   University of Washington
> Biostatistics, SCHARP/HVTN          Fred Hutchinson Cancer Research Center
> UW (Tu/Th/F): 206-616-7630 FAX=206-543-3461 | Voicemail is unreliable
> FHCRC  (M/W): 206-667-7025 FAX=206-667-4812 | use Email
> 
> CONFIDENTIALITY NOTICE: This e-mail message and any attachments may be
> confidential and privileged. If you received this message in error,
> please destroy it and notify the sender. Thank you.
> 
>