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Old 01-07-2013, 12:03 PM   #1
alieblice
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limiting users ram usage by limits.conf


Hi
i want to limit ram usage of one user with /etc/limits.conf
the problem is that i don't know which parameter is for ram.
is it
Code:
memlock
               maximum locked-in-memory address space (KB)
or it's other parameters.
 
Old 01-07-2013, 12:25 PM   #2
johnsfine
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I don't think you can (with limits.conf).

The correct parameter would be rss, but I think that is not implemented.
 
Old 01-07-2013, 01:40 PM   #3
alieblice
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thanks for reply.
well rss is unusable in kernel above 2.4.30.

from limits.conf man page :
Code:
rss
               maximum resident set size (KB) (Ignored in Linux 2.4.30 and higher)
 
Old 01-07-2013, 08:41 PM   #4
chrism01
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How about
Quote:
as
address space limit (KB)
 
Old 01-08-2013, 12:32 PM   #5
alieblice
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Quote:
Originally Posted by chrism01 View Post
How about
thanks.
i will test it and put results here.
 
Old 01-09-2013, 02:48 PM   #6
alieblice
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i put this limit as hard limit but user cant even open vi or nano and get this error:
Code:
$ nano
nano: error while loading shared libraries: libtinfo.so.5: failed to map segment from shared object: Cannot allocate memory

Code:
lili    hard    as      500000
 
Old 01-09-2013, 05:09 PM   #7
johnsfine
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I think you are limiting virtual memory per process for a user, when you want to limit physical ram total (across processes) for that user.

If you use virtual memory as a limit on physical ram, you can't set the limit with any accuracy. Some processes might use as much physical ram as they use virtual memory, so a higher limit on virtual would let them use more physical than you want. Other processes (as you seem to have discovered already) use a small fraction physical ram for a large amount of virtual. Stopping them from doing so stops them from running at all, even if running them unlimited would have used very little physical ram.

Pre user across multiple processes is also hard to do. The relevant limits are per process for the specified user.

If I knew the solution, I would tell you. I'm posting to explain that the place you are looking for the solution is further from a real solution than it might appear.
 
Old 01-09-2013, 05:13 PM   #8
jmc1987
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From what I understand you have to isolate every user in a virtual environment using virtual technology. Something that cloudlinux make capable. I could be wrong though. There may be other ways.
 
  


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