* suspend a thread with an another thread
@ 2009-09-18 6:53 maxime louvel
2009-09-18 7:29 ` Peter Zijlstra
0 siblings, 1 reply; 2+ messages in thread
From: maxime louvel @ 2009-09-18 6:53 UTC (permalink / raw)
To: linux-kernel
HI all,
I'm doing a phd related to QoS and resources management within
distributed systems.
I would like to affect a CPU budget to my applications, one
application being a thread.
As I would like to experiment quickly my ideas in order to test them,
I wanted to use a little trick :
instead of modifying the linux scheduler (which I guess will take me a
lot of time because I'm not familiar with it) I tried to use a "super
thread".
My try was that this "super thread" with higher priority is suspending
the other threads if they overcome their cpu budget.
I thought of something like activate an application thread, make the
super thread sleep for X time (cpu budget) and then wake up and
suspend the application thread until next time.
However I haven't been able to do that because I've read (and test
myself :) ) that :
- it is not possible to suspend a thread by an another thread (I don't
think I can use the pthread_cond facilities)
- as threads within a process share the signals and signal handlers I
can't send a signal (like SIGUSR1 or SIGSTOP) to a specific thread.
Correct me if I'm wrong
Is there a way I can do what I want ?
Or should I start by looking at how to modify the linux scheduler ?
thanks a lot,
Maxim
--
Maxime Louvel
+33 6 85 91 05 30
3 rue charreton
38000 Grenoble
France
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: suspend a thread with an another thread
2009-09-18 6:53 suspend a thread with an another thread maxime louvel
@ 2009-09-18 7:29 ` Peter Zijlstra
0 siblings, 0 replies; 2+ messages in thread
From: Peter Zijlstra @ 2009-09-18 7:29 UTC (permalink / raw)
To: maxime louvel; +Cc: linux-kernel
On Fri, 2009-09-18 at 08:53 +0200, maxime louvel wrote:
> HI all,
>
> I'm doing a phd related to QoS and resources management within
> distributed systems.
> I would like to affect a CPU budget to my applications, one
> application being a thread.
>
> As I would like to experiment quickly my ideas in order to test them,
> I wanted to use a little trick :
> instead of modifying the linux scheduler (which I guess will take me a
> lot of time because I'm not familiar with it) I tried to use a "super
> thread".
Kernel thread or userspace? I read the below as if you're meaning
user-space, since you talk about pthread stuff (at which point this
mailing list is off-topic).
> My try was that this "super thread" with higher priority is suspending
> the other threads if they overcome their cpu budget.
> I thought of something like activate an application thread, make the
> super thread sleep for X time (cpu budget) and then wake up and
> suspend the application thread until next time.
>
> However I haven't been able to do that because I've read (and test
> myself :) ) that :
> - it is not possible to suspend a thread by an another thread (I don't
> think I can use the pthread_cond facilities)
No, pthread_cond() is for waiting for an event to occur.
> - as threads within a process share the signals and signal handlers I
> can't send a signal (like SIGUSR1 or SIGSTOP) to a specific thread.
> Correct me if I'm wrong
try: man pthread_kill
> Or should I start by looking at how to modify the linux scheduler ?
Depends on what you want to do... how hard can it be right ;-)
^ permalink raw reply [flat|nested] 2+ messages in thread
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2009-09-18 6:53 suspend a thread with an another thread maxime louvel
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