Re: running only 1 process on 1 cpu

[Jesper Juhl]

On 16/05/06, fritzsch <fritzsch@xxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
> Hallo,
> i have one process, which i want to run on a cpu (> CPU0). The special
> thing here is, that this process is very time critical and  should NOT
> be interrupted by anything (cpusets/cpus_allowed would not be enough).
> (the process is not doing any system calls and is communicating to the
> world by shared memory).
> so i wanted to run the process on a CPU1, when all irqs are disabled and
> so the process could not be interrupted.
>
>
> I tried very simple to
>
> (1) migrate all processes to CPU0 by cpu_set_allowed
> (2) gave my process (running on CPU1) the highest priority
> (3) run schedule and make sure that the irqs are disables
> (disable_irqs())
> ...

Some ideas :

- Play with CPU affinity : "man sched_setaffinity" / "man sched_getaffinity" [1]
- Try a RealTime patched kernel (Ingo's -rt patchset) and set the
processes nice level to least nice & RT priority to the max [2]
- Implement the code as a kernel module if it really is that time critical


[1] http://www.linuxjournal.com/article/6799
[2] http://www.captain.at/howto-linux-real-time-patch.php

--
Jesper Juhl <jesper.juhl@xxxxxxxxx>
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