Could it be connected with the fact that each R session creates an
Rtmpsmth directory in tmp (at least on UNIX-alike) and that if started
simultaneously on machines with the same time stamp they might want to
use a directory with the same smth? It still does not explain the
behaviour much as, first, loading a package (with a shared object and
external dependencies) does not seem to cause creation of any files
there, and, second, I have never experienced such problems of our Linux
farm although there were situations where I launched about a hundred of
R session on a farm at the same time. Maybe the external library itself
uses this temp space and locks it?
Oleg
Vadim Organovich wrote:
Hi,
I am debugging intermittent crashes of R that seem to happen when multiple R
sessions nearly summaltaneously load same dll-based library.
I have R and my libraries installed on a network drive (everything is
Windows). The drive is visible from a farm of servers. I have an R script,
foo.R, that just loads a dll-based library (to be precise it loads a library
that requires a dll-based library). When I start R (via Rscript --vanilla
foo.R) from all of the farm computers summaltaneously some of the sessions
often crash. It doesn't seem to be specific to the library, I was able to
reproduce this with the gbm library as well as with my own library. It feels
that the longer it takes to load the library the higher the probability of
the crash.
foo.R :
library(vmisc)
The most informative error message I've got so far looks like this, here
vmisc dll is the required library that dynamically loads a dll.
Loading required package: vmiscdll
Error in file(file, r) : unable to open connection
In addition: Warning message:
In file(file, r) :
cannot open file 'q:/R/vogranovich/library/vmisc/R/vmisc', reason
'Permission denied'
Error : unable to load R code in package 'vmisc'
Error: package/namespace load failed for 'vmisc'
Execution halted
Exit Code 1 - Process forcefully killed by the TestMaster
In stand alone sessions, interactive or not, everything loads fine.
Does loading a library place some sort of a lock?
I would appreciate any help with this matter.
Regards,
Vadim
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