How Linux restricts the use of resources

Many people say Virmach is not good, always suspend, I have never been suspend, build station is also very stable, so I would like to say how to operate (in fact, follow their TOS, if you are abusive user, rolling coarse):

To read the TOS first, the core rules are:
(1) The CPU can not be more than 5 minutes of burst more than 95%, two hours not higher than 50%,
(2) Limit Io, not more than 300 consecutive 10 minutes,
(3) Limit mail, no more than 100 per hour,

So do a few things in a targeted way:
One, under the/root/to establish the cpulimit.sh to execute the authority (the release occupancy rate below 10% the procedure, limits 60% above the procedure)
CPULimit--pid ' ps Aux|awk ' {if ($ <) print $ "--limit=99
CPULimit--pid ' ps Aux|awk ' {if ($ >) print $ "--limit=25
Second, install Cpulimt,apt-get installed cpulimit-y
Three, the execution cpulimt.sh write to Crontab, every five minutes to execute once, if there is any program CPU use more than 60%, it is limited to 25%, while releasing the low-occupancy program limit.

If you build a station, that's enough.

If you want to limit Io, then go to Cgroup/blkio. As for the mail, that's my thing ...

From Forum http://www.hostloc.com/thread-327153-1-1.html

How Linux restricts the use of resources