Re: running only 1 process on 1 cpu

From: Jesper Juhl
Date: Tue May 16 2006 - 15:48:31 EST

On 16/05/06, fritzsch <fritzsch@xxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
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

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


Jesper Juhl <jesper.juhl@xxxxxxxxx>
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