Try using the deadline scheduler On Mon, Feb 20, 2012 at 12:14 PM, Tilghman Lesher <[email protected]> wrote: > On Mon, Feb 20, 2012 at 11:59 AM, tocsa <[email protected]> wrote: >> The server in our laboratory has some problems. A PhD student is >> running computation which has very heavy I/O load, but no CPU load. >> The lack of CPU load means that there's nothing which would hold back >> the process to hog the hard drive. Many of you are server >> administrators so you know the concept of "server load". If it is >> above 3, then the server is under very heavy load, above 6-7 it can >> happen that you cannot log-in remotely. >> So far my techniques is that I keep an open root console on my desktop >> machine at the university, that console is always alive. Last week I >> saw load above 22. Today I had to take a screenshot, so when I'll be a >> grandpa I can show it to my grandchildren: load above 76. >> >> The machine is a server hardware, quad core with 16GB RAM, I don't >> exactly know the HDD subsystem, browsing the /proc I think it's some >> kind of SAS disks. It is running Ubuntu Server LTS. >> >> Question: how can I limit the I/O access of a process? >> >> I've seen numerous articles on disk quotas, network bandwidth tuning, >> some on CPU load tuning, but no I/O load tuning. > > There's nothing I can see that would do that. However, since what > you're really aiming to do is to avoid resource starvation, why not > re-nice his process? Give it a slightly lower priority, and > everything else will preempt his process when those other processes > need CPU and I/O time. Ask him nicely, and he may even start his next > process with a nice'd priority. > > -- > You received this message because you are subscribed to the Google Groups > "NLUG" group. > To post to this group, send email to [email protected] > To unsubscribe from this group, send email to > [email protected] > For more options, visit this group at > http://groups.google.com/group/nlug-talk?hl=en
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