[Jack-Devel] subgraph timeout [was Re: softmode for dummy driver]

On Fri, August 29, 2014 12:09 pm, Joakim Hernberg wrote:
> On Fri, 29 Aug 2014 01:10:28 +1000 (EST)
> "Patrick Shirkey" <[hidden]> wrote:
>
>> As the dummy driver is not affected by xruns is there an easy/obvious
>> way to identify the actual cause of the delay that is triggering the
>> subgraph timeout error?
>
> You can try to build jack2 with it's profiling option.  it allows you
> to get nice graphs and analyze if it's the hardware or a client giving
> you a xruns.  See:  http://lac.zkm.de/2005/papers/letz_et_al.pdf for
> the gory details :)
>

In this case the issue appears not to be related to xruns as the dummy
driver doesn't do that.

Does jackdmp provide details on subgraph timeout issues? I presume it
would only see them when they happen rather than predict that they might
happen.

What does this error message imply exactly:

subgraph starting at jack-smf-player timed out (subgraph_wait_fd=16,
status = 0, state = Triggered, pollret = 0 revents = 0x0)

Are there specific details I can print in the app or in the jack error
message to assist with identifying the cause of the delay?





--
Patrick Shirkey
Boost Hardware Ltd

1409295447.29242_0.ltw:2, <63790.86.107.254.57.1409295438.squirrel at boosthardware dot com>