Restarting Engine after Song Load

[Torsten]

@dave_dore

I am reviving this thread because of the behaviors I am experiencing on my performance rigs. I preload some hungry plugs and when the set-list finishes loading and loads Song one on the list the load value is on average about 30% higher than it would be if I did an engine reset before playing anything. On my rig while running Ivory, B-3X and MODO bass with a single reverb buss running Eventide ultra reverb that would be around 70 to 75% but after the engine reset it settles at about 40 to 45% so it is a great load reduction and gives the load headroom needed for B-3X Leslie speed ramping.

I came across this some time last year when we had another computer config discussion:

Feedback computer config

Now here’s an interesting discovery: I start Cantabile, set audio engine to “Null Audio” I load the song “Perftest” - Time load settles at around 32% average on my studio PC now I stop the audio engine (on/off switch) - time load (obviously) goes down to zero now I turn the audio engine back on - bindings fire again and start playback (since Song->onLoad also fires on turning the audio engine back on) now the time load is only at around 14% average and 20% maximum same on my old live laptop - …

Interesting enough, I ran Cantabile on 4 machines; the problem only occurred on two of them.

@brad promised to run some tests on this at the time, but apparently nothing conclusive came from that - I imagine it’s pretty difficult when you can’t reproduce the issue…

I just tested the scenario again on my studio PC - now the time load stays stubbornly at around 35%, now matter how often I restart the audio engine.

And TBH, I think that this 35% is a fair representation of the CPU load - maybe the reduction in time load was a reporting / measuring issue? It doesn’t really make sense that my (weaker) old live laptop should run the performance test song at far lower time load than my newer one after engine restart.