On Tue, 18 Jan 2005, bogdan romocea wrote: > It appears you wouldn't get much improvement at all even if the 2nd CPU > were used at 100%. Five R sessions can easily overwhelm one CPU. I > think you need (a lot) more CPUs than 2 to solve your problem. > > Possible solutions: > 1. Install R on each eMac. Since you have 40 of them, you might want to > put together a script to do this. > 2. Get some boxes that can run Windows. On Windows, you can run R from > a CD/zip drive/USB drive. (So you could burn 40 CDs and have everyone > run their R session on their box.) As far as I know the same is not > true for GNU/Linux and Mac OS. >
Mac OS X is certainly capable of running programs on CD/Zip/USB drive. > -----Original Message----- > From: Sam Parvaneh > Sent: Monday, January 17, 2005 6:11 AM > To: [email protected] > Subject: [R] help wanted using R in a classroom > > 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. > > 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 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? You didn't mention where R is currently installed. What is the path to the R framework and is that located on the XServe? If only the student's personal R library directory is involved, that shouldn't cause these problems. Did you try creating a disk image (dot-dmg) containing the R application and have it mount locally on each eMac? ---------------------------------------------------------- SIGSIG -- signature too long (core dumped) ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
