[zeromq-dev] zmq_socket and threads

Nishant Mittal nmittal at rblt.com
Thu Jan 3 16:39:49 CET 2013


Andy, your arguments make sense and I am now creating/closing sockets
inside each thread. and at some point, as Pieter suggested, we will look at
redesigning the app so work load is distributed using zeromq to worker
threads.

thanks


On Thu, Jan 3, 2013 at 7:09 AM, Andy Ballingall TF <
ballingall at thefoundry.co.uk> wrote:

> Nishant,
>
> Though not directly related to your question (which is useful to know), I
> wondered if your use-case should present problems in any event.
>
> Isn't the only issue with file descriptors and tcp sockets that the file
> descriptor cannot be released until TIME_WAIT has elapsed?
>
> TIME_WAIT is 'maximum segment lifetime * 2' (MSL*2), and is usually
> something between 2 and 10 minutes.
>
> 'http://en.wikipedia.org/wiki/Maximum_segment_lifetime
>
> In your use case, you're only opening a few sockets a minute, so you
> shouldn't overwhelm the system with sockets in TIME_WAIT state.
>
> As far as I know, the only use-cases where this matters is if your rate of
> socket creation and destruction is sufficiently high to result in a
> steadily growing number of TIME_WAIT sockets which hit the kernel limit.
>
> If, over any specific period of time of length TIME_WAIT, your rate of
> socket destruction is guaranteed to be below the kernel limit, then you
> shouldn't reach that limit at all should you?
>
> Andy
>
>
>
>
> On 2 January 2013 21:23, Nishant Mittal <nmittal at rblt.com> wrote:
>
>> I know that zmq_sockets are not thread safe. however, is it an issue if I
>> ensure a socket is used ONLY by 1 thread at a time?
>>
>> the reason is ...
>> 1) my application creates 5 threads, does some calcs and then the threads
>> exit
>> 2) this is done every minute. so every minute 5 new threads are created.
>> 3) I think i will run into a file descriptor issue if i create sockets
>> inside the thread (every time the thread is launched). so planning to
>> create 5 sockets when my application starts and then use 1 socket from 1
>> thread.
>>
>> is this going to be an issue?
>>
>> thanks
>> Nishant
>>
>>
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>>
>>
>
>
> --
> Andy Ballingall
> Senior Software Engineer
>
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-- 
*Nishant Mittal*
Director, Product Development
*Rosenblatt Securities Inc*.
20 Broad Street
New York, NY 10005

Direct: 212-607-3159
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