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

A.J. Rossini rossini at blindglobe.net
Tue Apr 20 18:02:03 CEST 2004

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.


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
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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
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