[zeromq-dev] ZeroMQ background threads

[Francesco]

Ok, but just to be sure: a PR would be a Github issue?

Thanks,
Francesco

2017-05-19 13:00 GMT+02:00 Luca Boccassi <luca.boccassi at gmail.com>:
> On Fri, 2017-05-19 at 12:37 +0200, Francesco wrote:
>> However I realized that the API does not provide affinity control,
>> which
>> can be controlled with the sched_setaffinity() API:
>>   https://linux.die.net/man/2/sched_setaffinity
>>
>> Could we add a ZMQ_THREAD_AFFINITY option to zmq_ctx_set() ?
>>
>> Thanks,
>> Francesco
>
> Sure, feel free to send a PR to libzmq.
>
> Should be pretty easy to implement simply copying what it's being done
> for the other two options.
>
> Kind regards,
> Luca Boccassi
>
>> 2017-05-19 12:25 GMT+02:00 Francesco <francesco.montorsi at gmail.com>:
>>
>> > Wow, great, I didn't know about ZMQ_THREAD_SCHED_POLICY and
>> > ZMQ_THREAD_PRIORITY, thanks!!
>> >
>> > Francesco
>> >
>> >
>> > 2017-05-19 12:20 GMT+02:00 Luca Boccassi <luca.boccassi at gmail.com>:
>> > > On Fri, 2017-05-19 at 11:58 +0200, Francesco wrote:
>> > > > Hi,
>> > > > I'm using ZeroMQ in an applications with several threads (up to
>> > > > 40).
>> > > > I noticed that in the "master" branch of ZeroMQ the background
>> > > > threads
>> > > > it creates are given a name. That's VERY useful, thanks!
>> > >
>> > > No problem. Had the same issue myself. One day I'd like to
>> > > further
>> > > improve it to have more specific names (I/O, reaper, shutdown),
>> > > but it
>> > > would require a lot more refactoring so for now all threads have
>> > > the
>> > > same name.
>> > >
>> > > > However my question is: my application sets the affinity and
>> > > > the
>> > > > priority of all threads it creates explicitly. Of course
>> > > > it  cannot
>> > > > set the affinity/priority of ZMQ background threads.
>> > > > Is it possible to add an API to get the pthread_t (on Linux) or
>> > > > the
>> > > > generic thread handle (platform-dependent) associated with the
>> > > > ZMQ
>> > > > background threads?
>> > > >
>> > > > In that way my application would be able to set affinity and
>> > > > increase
>> > > > priority also of ZMQ background threads...
>> > >
>> > > There is already an API to set those. Check the manpage for
>> > > zmq_ctx_set, and the following options: ZMQ_THREAD_SCHED_POLICY
>> > > ZMQ_THREAD_PRIORITY
>> > >
>> > > Note that as the manpage says you need to set them before
>> > > creating any
>> > > socket, immediately after creating the context.
>> > >
>> > > Kind regards,
>> > > Luca Boccassi
>> > > _______________________________________________
>> > > zeromq-dev mailing list
>> > > zeromq-dev at lists.zeromq.org
>> > > https://lists.zeromq.org/mailman/listinfo/zeromq-dev
>>
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