Re: [Discuss-gnuradio] issues with thread priority

[Simone Ciccia S210664]

Hi Marcus,
thank you for the support.

Yes, I configured the files as follows:

/etc/security/limits.conf

#<domain>      <type>  <item>         <value>
#

#*               soft    core            0
#root            hard    core            100000
#*               hard    rss             10000
address@hidden        hard    nproc           20
address@hidden        soft    nproc           20
address@hidden        hard    nproc           50
#ftp             hard    nproc           0
#ftp             -       chroot          /ftp
address@hidden        -       maxlogins       4
#di base:
@usrp            -       rtprio          99

# End of file

/etc/group

simone:x:1000:
usrp:x:1001:simone

I discovered that, testing the following code (e.g in codeblocks),

#include <iostream>
#include <sched.h>   //cpu_set_t , CPU_SET
#include <pthread.h> //pthread_t
#include <stdio.h>

using namespace std;

int main()
{
        int policy = SCHED_RR;
        int min_pri = sched_get_priority_min(policy);
        int max_pri = sched_get_priority_max(policy);

        sched_param sp;
        sp.sched_priority = int((max_pri - min_pri)) + min_pri;

        int ret1 = pthread_setschedparam(pthread_self(), policy, &sp);
        if (ret1 != 0)
                std::cout << "\nError in pthread_setschedparam\n";
        else
                std::cout << "\nPriority success\n";
}

it succeed to set priority.
However, within a gnuradio block it fails.
Any suggestion?



Il 20.02.2016 15:57 Marcus Müller ha scritto:
> Hi Simone,
>
> is your user allowed to set thread priority? See the Linux notes under 
> [1].
>
> Best regards,
> Marcus
>
> [1] http://files.ettus.com/manual/page_general.html#general_threading
>
>
> On 02/19/2016 12:22 PM, Simone Ciccia S210664 wrote:
> > Hello,
> >
> > I'm experiencing some issue trying to set block thread priorities.
> >
> > I discovered that my USRP is not able to set thread priorities since
> > the function pthread_setschedparam(pthread_self(), policy, &sp); 
> > fails.
> >
> > Therefore, I tryed to test a simple block (whatever), inserting the
> > core affinity to a processor (e.g. CPU 0) directly in the block GUI,
> > then, in the block constructor I set the thread priority with
> >
> > gr::thread::set_thread_priority(gr::thread::get_current_thread_id(),99);
> >
> > The priority value is retrieved in the work function, and tells that
> > the thread priority is set to 0 (wrong).
> >
> > I suspect that there is a limitation somewhere (probably in the linux
> > kernel or in some configuration file), I tryed it on another machine
> > without problems (all works correctly).
> >
> > Can you help me?
> >
> > _______________________________________________
> > Discuss-gnuradio mailing list
> > address@hidden
> > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>
>
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