11 Apr
2015
11 Apr
'15
12:25 p.m.
Nonetheless,
if I have 40 instances of zyn, I'd
like to (actually must) compute them concurrently. So how to do this with
one client?
By using your own internal graph mechanism that has parallel capabilities.
See, for excample, https://github.com/flowprogramming/dspatch The best way I
can see is using an array of jack clients, and hoping
they'll process() at the same time. However, this sounds very tricky...
There can be very good reasons for using JACK 1. If a user is doing that,
you won't get any parallelization at all. 
11 Apr
11 Apr
1:46 p.m.
New subject: [Jack-Devel] Avoiding spinlocks in a parallel sequencer
On Sat, Apr 11, 2015 at 1:25 PM, Johannes Lorenz <
johannes89(a)mailueberfall.de> wrote:
capabilities.
it was just an example. ultimately, *some* synchronization primitive is
required. the question is what is the least bad choice ....
Does JACK 2 allow to use multiple jack clients that call process() at the
same time? Or does it allow to enter process() with multiple threads? There
seems to be no documentation/tutorial about JACK 2.
clients do not "call process". process() is called on their behalf, by the
server, in a thread chosen by the server.
the relationship between threads and callbacks is an undocumented,
implementation specific part of JACK, and differs between JACK1 and JACK2.
>
Nonetheless, if I have 40 instances of zyn, I'd
> like to (actually must) compute them concurrently. So how to do this
with
one
client?
By using your own internal graph mechanism that has parallel See, for excample,
https://github.com/flowprogramming/dspatch
This one is based on pthread_cond_wait(), which is either implemented as a
spinlock or not realtime safe (I guess the second). So how can this help?
The best
way I can see is using an array of jack clients, and hoping
they'll process() at the same time. However, this sounds very tricky...
There can be very good reasons for using JACK 1. If a user is doing that,
you won't get any parallelization at all. 
6:11 p.m.
New subject: [Jack-Devel] Avoiding spinlocks in a parallel sequencer
On Sat, April 11, 2015 19:25, Johannes Lorenz wrote:
Does JACK 2 allow to use multiple jack clients that
call process() at the
same time?
Do you want to synchronize JACK clients so they do something in the same
cycle / at the same sample time?
You could inject an event to JACK that's being distributed to the clients
(inside JACK). The clients would then receive the events in the same cycle
and can process (at given sample pos) in that cycle.
Not sure if that's what you're looking for though :)
Regards
Thomas
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Paul Davis -
tom＠trellis.ch