Re: [Discuss-gnuradio] issues with thread priority

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
#@student hard nproc 20
#@faculty soft nproc 20
#@faculty hard nproc 50
#ftp hard nproc 0
#ftp - chroot /ftp
#@student - 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
>> Discuss-gnuradio@gnu.org
>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>
>
> _______________________________________________
> Discuss-gnuradio mailing list
> Discuss-gnuradio@gnu.org
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio

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