Re: Percent of CPU/Mem Usage for User

Question: Instead of just grabbing % of cpu/mem usage, is it possible to restrict or cap the usage, but put the script in a wait until it can continue? I'm curious if someone developed a module to do this. For instance, if the user is approaching the mem limit, dump some mem onto the HD. Or if the CPU limit is reached, wait until other jobs are finished processing, if possible, otherwise timeout.

Demize

Comment on Re: Percent of CPU/Mem Usage for User

Replies are listed 'Best First'.
Re^2: Percent of CPU/Mem Usage for User by geekt (Novice) on Jun 12, 2010 at 00:08 UTC
I was thinking about doing this. However, this would mean that the process would stay active, and I don't want that. Should be simple enough to do. I considered doing a slight wait, maybe a second or less, but considering this is actually going to be used in a CGI, not a good idea. You could use something similar to this to check if there are enough resources for a heavy task, and keep checking, with a maximum wait time...	[reply]
Re^3: Percent of CPU/Mem Usage for User by deMize (Monk) on Jun 14, 2010 at 15:12 UTC
Response: Yes, the process would stay active, but isn't that what's needed, at least until the script ends, or the process is terminated? My guess would be to fork this check. I'm uncertain why there aren't any hooks already into the Linux kernel to do this... perhaps there are, afterall, I come from the MS world :) Demize	[reply]
Re^4: Percent of CPU/Mem Usage for User by geekt (Novice) on Jun 14, 2010 at 17:03 UTC
Well, if this script is being called only once, such as with a cron job, that's fine. However, if you were to put this into a CGI script, the number of processes or memory could quickly get out of control. You could add a check to see how many processes are running under the user. Then you could kill it (or something else that's cleaner) if there are too many processes, or too much memory is used. This might be the best of both worlds.	[reply]