Ограничение ресурсов

# apt-cache show cpulimit
Package: cpulimit
Priority: optional
Section: universe/admin
Installed-Size: 60
Maintainer: Ubuntu MOTU Developers <ubuntu-motu@lists.ubuntu.com>
Original-Maintainer: gregor herrmann <gregor+debian@comodo.priv.at>
Architecture: i386
Version: 1.1-10
Depends: libc6 (>= 2.5-0ubuntu1)
Filename: pool/universe/c/cpulimit/cpulimit_1.1-10_i386.deb
Size: 9236
MD5sum: ce39e3ff946e5b3d1a17dc2cfff2c92a
SHA1: 4b79eae396a6500ed5a2d12991953332ac6a667f
SHA256: e1583f66a430548aa7af3f43fda38ac23d202c09980ede79ce7e94d5bc9602de
Description: limits the cpu usage of a process
 cpulimit is a simple program that attempts to limit the cpu usage of a
 process (expressed in percentage, not in cpu time). This is useful to
 control batch jobs, when you don't want them to eat too much cpu. It does
 not act on the nice value or other priority stuff, but on the real cpu
 usage.  Besides it is able to adapt itself to the overall system load,
 dynamically and quickly.
 .
  Homepage: http://cpulimit.sourceforge.net/
Bugs: mailto:ubuntu-users@lists.ubuntu.com
Origin: Ubuntu

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или man sh на предмет ulimit

nice?

Нице приоритетная фигня, и если не ошибаюсь - то ее алгоритм основан на процентном соотношении. В результате когда система простаивает - на скорости выполнения процесса это не отобразится.

Необходимы более жесткие варианты.