On my OS X box, "R" is a link to the R script located on an NFS mounted file system:
[166]% ls -l /usr/local/bin/R
lrwxr-xr-x 1 root wheel 42 9 Dec 12:25 /usr/local/bin/R@ -> /statsrvr/apps/R/R-2.0.1/darwin/bin/R
[167]% df -k | grep statsrvr
statbox:/APPS1 9830344 9161202 659312 93% /private/automount/statsrvr/apps
statbox is a Solaris machine.
So, R is "installed", by which I mean all of its files are located on, a server, but when I run it, it runs locally.
So I think should be able to arrange things so that each student's R session runs on the eMac in front of him, instead of on the server.
-Don
At 12:11 PM +0100 1/17/05, Sam Parvaneh wrote:
Hi everyone!
I'm using R 2.0.1 for Mac OS X in a classroom with 40 eMacs running Mac OS X version 10.3.6. These Macs are network based, meaning that the students log in to an XServe G4 where their user accounts and home directories are stored.
Do they actually log in to the XServe, or do they login to the eMac and have their home directories mounted on the eMac?
The problem that I'm having each time a group of students (usually 7 to 10) use R is that the whole system get incredibly slow. The response time for opening an application while the students are running R is around 5 minutes. If a student wants to log into the system while others are running R, it can take up to 10 minutes for the student to get logged in. Everything gets very slow that it's almost impossible to work. When I look at the server Graphs, the CPU usage of the first CPU is always 100% when these students are using R. The second CPU is left at 15%.
When these students quit R, then everything's is back to normal again. The usage of both CPUs go back down to between 5-10%. Is there anyone out there using R in a university like this? Does anyone have an idea what this might depend one or maybe a solution? I can provide some more information if anyone wants, if you think you can help me.
Thanks in advance /Sam
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-- -------------------------------------- Don MacQueen Environmental Protection Department Lawrence Livermore National Laboratory Livermore, CA, USA
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