CPULimits [FreeBSD WIKI]

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====== CPU percentage limits ======

===== Project description =====

The goal of the project is to add the CPU percentage usage accounting to the existing racct/rctl infrastructure. I want to make it possible for the system administrator to limit either a particular process, a particular user or a particular jail to for example 30% CPU.

===== Deliverables =====
  * CPU limits for process
  * CPU limits for user
  * CPU limits for jail

===== Milestones =====
  * **May 21 - June 10**: add racct/rctl cpu usage accounting, applicable only to a thread, support only for one scheduler.
  * **June 11 - June 24**: add racct/rctl cpu usage accounting, applicable also to a user, support only for one scheduler.
  * **June 25 - July 1**: add support for the second scheduler
  * **July 2 - July 8**: testing
  * **July 9 - July 13: Mid-term Evaluations**
  * **July 9 - July 22**: switch implementation to the second approach using periodic racct_set() iterating over all processes from racctd
  * **July 23 - August 5**: revising/improving the percentage calculation algorithm
  * **August 6 - August 12**: documentation, testing
  * **August 13: End of coding (soft)**
  * **August 13 - August 19**: documentation, testing
  * **August 20: End of coding (hard)**

===== Contact =====
  * [[/RudolfTomori|Rudo Tomori]] - student
  * [[/EdwardTomaszNapierala|Edward Tomasz Napierała]] - mentor

===== SVN repositary =====
  * https://socsvn.freebsd.org/socsvn/soc2012/rudot/

===== Patches =====
  * %%FreeBSD%%-CURRENT http://www.ms.mff.cuni.cz/~tomor6am/racct-pcpu/racct_pcpu_current_oct_25_2012.patch
  * %%FreeBSD%% 9-STABLE http://www.ms.mff.cuni.cz/~tomor6am/racct-pcpu/racct_pcpu_releng_9_oct_25_2012.patch

==== Apply the patch as follows ====

cd /usr/src\\ 
patch -p1 < //patch-file.patch//

==== Required kernel options ====
options RACCT\\ 
options RCTL

==== Usage examples ====

rctl -a user:tom:pcpu:deny=60
Adds a 60% cpu limit for user tom.

rctl -a process:1657:pcpu:deny=70
Adds a 70% cpu limit for process with id 1657.

===== Useful links =====

  * [[/Hierarchical_Resource_Limits]]