Re: [ckrm-tech] [patch 25/38] CKRM e18: Add fork rate control to the numtasks controller

Chandra Seetharaman
2005-06-27T19:11:09Z

On Mon, 2005-06-27 at 16:07 +0900, Naoaki Maeda wrote:
> Gerrit Huizenga wrote:
>
> > +As with any other resource under the CKRM framework, numtasks also assigns
> > +all the resources to the detault class(/rcfs/taskclass). Since , the number
> > +of tasks in a system is not limited, this resource controller provides a
> > +way to set the total number of tasks available in the system through the config
> > +file. By default this value is 128k(131072). In other words, if not changed,
> > +the total number of tasks allowed in a system is 131072.
> > +
> > +The config variable that affect this is sys_total_tasks.
>
> Because there are people who do not want to use the numtask controller,
> no limit is a preferable default value for sys_total_tasks.

It is not a limit, it is the system level number of tasks assumed by the
numtasks controller, so, it cannot be a _no limit_, it has to be real
number.

If one doesn't want a controller, they can avoid compiling it in, and
numtasks even allows one to use it as a module.

If your real concern is that the number is too small, we can make it
bigger.
>
> > +Usage
> > +-----
> > +
> > +For brevity, unless otherwise specified all the following commands are
> > +executed in the default class (/rcfs/taskclass).
> > +
> > +As explained above the config file shows sys_total_tasks and forkrate
> > +info.
> > +
> > + # cd /rcfs/taskclass
> > + # cat config
> > + res=numtasks,sys_total_tasks=131072,forkrate=1000000,forkrate_interval=3600
> > +
> > +By default, the sys_total_tasks is set to 131072(128k), and forkrate is set
> > +to 1 million and forkrate_interval is set to 3600 seconds. Which means the
> > +total number of tasks in a system is limited to 131072 and the forks are
> > +limited to 1 million per hour.
>
> >From the same point of view, the default value of forkrate should be
> no limit. (In addition, 1 million tasks per hour is not an abnormally
> high rate.)

we can make it 1 million / second (or minute).
>
> Thanks,
> MAEDA Naoaki
>
>
>
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Chandra Seetharaman | Be careful what you choose....
- sekharan@us.ibm.com | .......you may get it.
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