Midi & VST & VSTParameters

[matti]

Do you have a schematic you can email to us that shows the high cpu load you're experiencing?

If you could send us something that would be great.

Many thanks!

Yeah sure
Here they are:
https://dl.dropbox.com/u/880206/ipmidi.zip
https://dl.dropbox.com/u/880206/knobmidi.zip
I also emailed you the links. There's the schematics inside + vsti plugins and an exe + reaper project files to demo the effect.

Two cases:
1. IpMidi: Sending incoming midi as text over lan(client vsti) and receiving it to a standalone that outputs it to a midi port(server exe) - the broken thing in this scenario is the midi-input of the plugin. It's raising cpu usage by huge amounts, and less but still too much if there's nothing connected to the midi-event splitter primitive.

2. KnobMidi: Sending a knobs value as midi to a midi-port. Basic CC message. This sucks the hell out of a 3ghz quad cpu with just one CC message stream.

As i was making those examples i also made a shocking discovery! The slowdowns are more aggressive with USB-midi ports! Class compliant drivers might be more prone to this.. Can't say for sure as an E-MU port is having quite a big cpu usage too, with its own driver, whereas M-Audio port doesn't.. and pci based ones have lower, but still not normal, cpu usages.
Didn't see that coming, but it kind of makes sense. Slower port and bad driver + FS oddity = very bad performance.

Let me know if you can duplicate the problem.. or better yet find possible solutions for me to test out