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

[Naoaki Maeda <maeda.naoaki@jp.fujitsu.com>]

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.

> +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.)

Thanks,
MAEDA Naoaki