Re: [Jack-Devel] need a little help with jack_midi_latency_test

On Mon, Apr 11, 2011 at 8:39 PM, Chris Caudle <[hidden]> wrote:
> On Mon, April 11, 2011 9:57 pm, Devin Anderson wrote:
>> Make sure the -Xalsarawmidi switch comes *before* the -dalsa switch
>
> OK, that fixed some things.

Excellent. :)

> This should take only a few seconds, right?

Probably not.

How long the test takes is proportional to the number of messages you
send, the MIDI out port latency, and the MIDI in port latency.

> I start the test, and it
> still hasn't finished after a minute or two, so I think something is
> hanging.
>
> Started everything like this:
>
> /usr/local/bin/jackd -t2000 -Xalsarawmidi -dalsa -dhw:0 -r44100 -p2048 -n2
> -i2 -zt
>
> jack_midi_latency_test -m 3 -s 8192 -t 5 "system:1-1 Lexicon Lambda 1 out"
> "system:1-1 Lexicon Lambda 1 in"

A test with these parameters will take more than a couple minutes.
The program will tell you if a message takes more than 5 seconds to
send and receive (the -t switch).

If you want to speed up the test, start JACK with a smaller period
size (1024, 512, 256, etc.), or send out less messages (-s 8192 means
you're testing with 8192 MIDI messages).

-- 
Devin Anderson
devin (at) charityfinders (dot) com

CharityFinders - http://www.charityfinders.com/
synthclone - http://synthclone.googlecode.com/

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