[LAD] Is Piperware a successor to Jack/Pulseaudio?

[Wim Taymans]

On Tue, 6 Jul 2021 at 21:41, Fons Adriaensen <fons at linuxaudio.org> wrote:
>
>
> I'll give PW its chance when the developers tell me it's ready for
> real life. Which will mean a session with around 15 jack clients
> with a total of 800 or so ports. Should run without hickups while
> watching a youtube movie and compiling a kernel at the same time
> (which I can do now without any problem).

Challenge accepted!... I made a little jack client with 32 input and 32 output
ports that memcpy the samples. Then I started 16 of those and linked them
all in a long chain.

Then I linked the input of the chain to a USB mic and the output to another
USB card (it needs to do adaptive resampling to keep this going),

That takes about 6 seconds to setup on my machine. I run this with a buffer
size of 128 samples and 48KHz.

Then I started firefox and loaded a video. Then I also started compiling
all of GStreamer on all cores.

Here is the screenshot: https://people.freedesktop.org/~wtay/pw-load.png

Works okish, some xruns here and there and this is a stock fedora setup
with extra rtprio for the user. No low latency kernel or any tuning. I had to
increase the max fds to 8192. I'm sure you can eliminate more xruns with
some tuning. This utterly fails with jackd on this system, it doesn't even want
to start all the clients, I'm sure it's something with the config somewhere...

This is probably not a representative setup but at 16+ clients and 1024+ ports
we're ballpark.. It probably starts to fail more with some real processing.

While testing I found a scalability bug in the feedback loop detection, which
should be fixed now. It might explain startup delays with complex projects...

Wim




>
> Ciao,
>
> --
> FA
>
>
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