1 `JACK2 <http://jackaudio.org/>`_
2 ################################
4 .. image:: https://travis-ci.org/jackaudio/jack2.svg?branch=master
5 :target: https://travis-ci.org/jackaudio/jack2
7 JACK2 aka jackdmp is a C++ version of the JACK low-latency audio server for
8 multi-processor machines. It is a new implementation of the JACK server core
9 features that aims at removing some limitations of the JACK1 design. The
10 activation system has been changed for a data flow model and lock-free
11 programming techniques for graph access have been used to have a more dynamic
14 - uses a new client activation model, that allows simultaneous client
15 execution (on a SMP machine) when parallel clients exist in the graph (client
16 that have the same inputs). This activation model allows to better use
17 available CPU on a smp machine, but also works on mono-processor machine.
19 - uses a lock-free way to access (read/write) the client graph, thus
20 allowing connections/disconnection to be done without interrupting the audio
21 stream. The result is that connections/disconnections are glitch-free.
23 - can work in two different modes at the server level:
25 - *synchronous activation*: in a given cycle, the server waits for all
26 clients to be finished (similar to normal jackd)
28 - *asynchronous activation*: in a given cycle, the server does not wait for
29 all clients to be finished and use output buffer computed the previous
31 The audible result of this mode is that if a client is not activated
32 during one cycle, other clients may still run and the resulting audio
33 stream will still be produced (even if its partial in some way). This
34 mode usually result in fewer (less audible) audio glitches in a loaded