Re: 2.6.11-mm2

["J.A. Magallon" <jamagallon@able.es>]

On 03.09, Robert Love wrote:
> On Tue, 2005-03-08 at 23:36 +0000, J.A. Magallon wrote:
> 
> > Can cpu affinity really be changed for a running process ?
> 
> Yes.
> 
> > Does it need something like io or yielding to take effect ?
> 
> No.
> 
...
> 
> Although, you have the syntax wrong.  It should be
> 
> 	taskset -c 0 -p 8277
> 

That was what I first tried, but:

werewolf:~> ps -ef | grep box
magallon  8638  8629 99 00:47 pts/0    00:01:54 box-d --out box.srf @opt
magallon  8733  8643  0 00:48 pts/2    00:00:00 grep box
werewolf:~> taskset -c 0 -p 8638
execvp: No such file or directory
failed to execute -p

> 
> > The program uses posix threads, 2 in this case. The two threads change from
> > cpu sometimes (not too often), but do not go into the same processor
> > immediately as when I start the program directly with runon/taskset.
> 
> You have to bind all of the threads individually.
> 

Ahh, damn, that explains it. I use a main thread that does nothing but
wait for the worker threads. So it sure gets moved to CPU0, but as it
does not waste CPU time, I do not see it...

Thanks. Will see what can I do with my threads. cpusets, perhaps...

--
J.A. Magallon <jamagallon()able!es>     \               Software is like sex:
werewolf!able!es                         \         It's better when it's free
Mandrakelinux release 10.2 (Cooker) for i586
Linux 2.6.11-jam3 (gcc 3.4.3 (Mandrakelinux 10.2 3.4.3-3mdk)) #1