[Jack-Devel] shm registry full errors

[marcin at saepia.net]

Well I understand but what I observe is that JACK has unpredictable amount
of total clients which is an issue, regardless if it's closer to 10 than
1000.

I have found out at least 3 conditions that affect this:

- compilation flags, which by the way may cause jack to segfault if they
are set too high

- parameter to jackd

- MAX_SHM_ID

I suggest integrating this into one runtime command line parameter.

M.
09.06.2016 1:39 PM "Paul Davis" <paul at linuxaudiosystems.com> napisał(a):

> shared memory is not a very malleable resource. you can't just arbitrarily
> increase the size of it like you can with heap memory.
>
> But running 250 JACK clients is not a viable workflow either. It doesn't
> scale in that way unless you're not interested in latency, in which case
> use PulseAudio.
>
> On Thu, Jun 9, 2016 at 6:32 AM, marcin at saepia.net <marcin at saepia.net>
> wrote:
>
>> Hello,
>>
>> I've found a piece of code that can be responsible for this:
>>
>> #define MAX_SHM_ID 256
>>
>> This is used to determine size of the registry.
>>
>> What is rationale for hardcoding this like this?
>>
>> m.
>>
>> 2016-06-09 12:02 GMT+02:00 marcin at saepia.net <marcin at saepia.net>:
>>
>>> Hello,
>>>
>>> at some point I am getting the following errors from JACK
>>>
>>> Jun  9 11:57:19 001-can1-plumber jackd[21110]: shm registry full
>>> Jun  9 11:57:19 001-can1-plumber jackd[21110]: Cannot create shared
>>> memory segment of size = 422
>>> Jun  9 11:57:19 001-can1-plumber jackd[21110]: JackShmMem::new bad alloc
>>> Jun  9 11:57:19 001-can1-plumber jackd[21110]: Cannot open client
>>> Jun  9 11:57:19 001-can1-plumber jackd[21110]: Cannot create new client
>>>
>>> Max locked memory for this process is set to 134217728 while launching
>>> JACK via systemd.
>>>
>>> It effectively causes JACK to hang.
>>>
>>> I am using 1.9.10 (commit 1ed50c92) on ubuntu 16.04.
>>>
>>> The configure flags are --clients=500 --ports-per-application=4 (I am
>>> not reaching 500 clients limit when that occurs, they are around 250).
>>>
>>> JACK is started with dummy driver, and --port-max set to 2000.
>>>
>>> What is the reason for hitting SHM limit? Can I overcome this in any way?
>>>
>>> m.
>>>
>>
>>
>> _______________________________________________
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>> Jack-Devel at lists.jackaudio.org
>> http://lists.jackaudio.org/listinfo.cgi/jack-devel-jackaudio.org
>>
>>
>
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