Re: [uml-user] concurent UMLs and cpu quota

[Cees de G. <cg...@cd...>]

Pavel Mihaylov wrote:
> Hi,
> 
> I need to run several UMLs at the same time but each of them should have
> access to a guaranteed part of the CPU power. It will be best to control
> CPU access by percents, i.e. this UML will have 5% guaranteed and that
> will have 10%. 
 >
It'd be easiest if the host Linux system would support this, but fat 
chance. Personally, I would monitor CPU usage (read the relevant 
/proc/<pid>/ stuff every 30 seconds or so) and renice UML's down that 
were over quota. The exact algorithms depend on what level of 
granularity you put 5% on, of course (at some level of granularity, the 
time slice, any process will have 100% CPU available, so you need to 
move up 'high' enough to have this make sense; a second at least).

Maybe there is some kernel extension that does this sort of scheduling; 
if not, it might be an interesting excercise to build one - it will have 
lots of value for UML users.