[Ardour-Users] jackd --sync

Will Godfrey willgodfrey at musically.me.uk
Mon Aug 19 00:54:15 PDT 2019

On Mon, 19 Aug 2019 08:41:44 +0200
Giso Grimm <gg3137 at vegri.net> wrote:

>On 18.08.19 22:11, jonetsu wrote:
>> Hello,
>> From time immemorial I always copy/pasted the same jackd command line.
>> And basically never questioned much about the other params except the
>> three last one which I've adjusted.
>> /usr/bin/jackd --sync -P80 -ndefault -dalsa -dhw:M1010LT -r44100 -p512
>> -n8
>> This is about:
>> jackd   5   
>> jackd2  1.9.12~dfsg-2
>> My question is, what is the purpose of the --sync option ?  
>with --sync, jack2 behaves the same way as jack1 in the way of
>scheduling the clients (no parallel graphs, but one block less
>processing delay).
>The --sync is important when extreme low delay processing matters -
>without the flag, jack2 uses three buffers even when set to two.
>This was recently discussed on the jack-dev list ("What about the number
>of buffers?").

Interesting. I never knew that.

As an aside, does anyone know what qjackctl does about this?
I always start jack with that at switch-on regardless of what other
audio software I use.

Will J Godfrey
Say you have a poem and I have a tune.
Exchange them and we can both have a poem, a tune, and a song.

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