[PD] slow midi on osX / pd-0.49

cyrille henry ch at chnry.net
Tue Apr 9 23:41:09 CEST 2019

My problem is very different than this issue.
It's about sending data, not receiving.
The problem is that the speed is not fast enough: latency can occur with large amount of data, but the midi port is not stuck.

I did not look at the code: I don't have a mac, I can just occasionally test on this platform.


Le 09/04/2019 à 22:55, Lucas Cordiviola a écrit :
> Hi Cyrille,
> Yes there's an open issue for it and it is for macOS & Windows :
> https://github.com/pure-data/pure-data/issues/554
> Would be great if it gets fixed.
> May be you spot the bug in the code?
> ?
> :)
> Mensaje telepatico asistido por maquinas.
> On 4/9/2019 3:29 PM, cyrille henry wrote:
>> Hello,
>> I noticed a change between pd-extended and pd 0.49 on OSX regarding
>> midi out.
>> My test patch is a 20ms metro that send 512 random midi control change.
>> This patch works perfectly under linux, with all pd version. (The
>> usb-midi device can handle it without any problem.)
>> On osX, I don't have any problem with pd extended. With pd 0.49, I
>> can't send that much data. pd is buffering the midi message : when I
>> stop the metro it keep sending data for few seconds or more before the
>> buffer is empty.
>> So, is there anything I can do to make 0.49 faster?
>> Should I fill a bug report?
>> (if you are wondering why I need to send so much midi data, it's
>> because I use a MIDI to DMX device to control a huge amount of led. I
>> use this interface for 15 years under linux, so I know there are no
>> problem on this side.)
>> cheers
>> Cyrille
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