Here we use NFS and Sage: we have 3 computers. The first one receives all the users'directories in a directory /ws. /ws is exported to the 2nd and 3rd computer and we have no performance problems. But ok, this is not the same configuration as yours where you have a lot of computers and only one nfs server.
The worsheets are very small objects; so I guess that the problem is somewhere else. If your nfs server is a linux machine, try to optimize it. There are some references about this: have more nfs daemons, have larger packet size. But may be you an other sort of network problem. t.d. Pablo Angulo a écrit : > Hello: > In my university, we have a room with 24 computers and one nfs server > serving the home folders for all of them. SAGE is installed in each of > the computers individually. As the course progresses, we're running into > severe performance problems when using SAGE in this setting. We have now > switched to local access, and we can proceed with the course without > problems, but we'd like to have the home folders shared between the > different computers if at all possible. > These are the clues to the issue: > * Other courses, running other software, use the nfs mounted home > folders with no problem, and with all the students logging in at the > same time. > * If only one, or a few computers log in, performance is good. > * If all the students use SAGE at once with local access, performance > is good, too. > * When they log into their nfs accounts, performance is poor but, > after a while that is getting longer, students can work normally. > * As a side comment, the nfs server seems to have enough RAM, CPU and > bandwith idle when all the computers struggle to open up SAGE. > So I'd say our problem is related to the big size of the .mozilla and > .sage folders going through the nfs folder (compared to the small > configuration folders of other programs). As the course progresses, > these folders are getting bigger, and that would explain the performance > issues and non-issues. > > My questions are: > * Does this make sense to you? > * Has any of you tried a similar configuration? > * Any hints on how we can get shared folders back? Maybe samba would > do better? Maybe rsync the folders on login and logout? Maybe use a > single SAGE server? > > Thanks >
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