enabling "Use JACK Midi" cause CPU overload - PRECISIONS
i'm using mscore 4af604c on kxstudio 12.04.3 updated and a low latency kernel 3.11
easy to reproduce :
1- start musescore
2- go to preferences > E/S
3- check "Use JACK Midi"
4- apply
5- one of my 4 core loads to 100% and never down back
to stop the isssue:
1- start musescore
2- go to preferences > E/S uncheck "Use JACK Midi"
3- restart musescore
4- cpu load is normal.
Comments
and "E/S" most probably is "I/O" in English...
you are right :-)
This happens ONLY when i have internal synth and ALSA checked. When ALSA or internal synth are uncheck, there is no issue (but start doesn't work for playing the score)
If I check Jack Audio Server, there is no overload, even if I use the "Use JACK midi" option.
Does it could be a wrong interaction between JACK and ALSA ?
I just gave some try with portaudio and it's the same result, musescore makes my cpu overload if I use "Use JACK Midi" AND another option in the use internal synth list.
In addition, i've no midi output, as related here : http://musescore.org/fr/node/22814
Futher tests seems to show that this overload is caused when activating MIDI Jack and other sound driver (ALSA or Portaudio). So the only workaround since now (and version 04d2ec7) is to use jack for both (MIDI and Audio).
Fixed in musescore 2.0