April 1, 2019 at 14:59 #5768
I’m curious; in my first tests my macbook 15″ touchbar runs fine with liveprofessor and RME madiface USB.
However, is the i7 turboboost potentially dangerous? If the CPU speed varies during live processing, what would happen?
There is this app “turbo boost switcher” that can disable turbo boost.
Would that be a good idea to use ? (It does lower the base CPU frequency, so it gives me less power)
HuubApril 2, 2019 at 00:41 #5769NikolaiParticipant
I have not made any tests on this really, but I agree with your theory that turning up/down CPU speed would be a bad idea.
It, of course, depends how hard you push it. It would be bad if your session relies on the extra clock speed of turbo boost and then gets hot and disables turbo during the session.April 2, 2019 at 06:57 #5770
If I leave turboboost enabled, the cpu load in liveprofessor stays very stable (at about 13% in my test setup) for several hours.
If I disable turboboost, liveprofessor stays at a stable 16 or so %.. So who knows what’s the safest bet? 🙂
HuubApril 2, 2019 at 12:34 #5771rapace312Participant
it’s been a while since i am doing some stability/performance tests on OSX (Mac Book Pro Retina, Mac Mini 2018,..)
Time has proven that disabling Turbo Boost has been a real gain of stability for real-time audio (64 buffer spl in LivePro).
You can try by yourself, with TB on, load a big LP project, change desktop and open Firefox Browser, audio is crackling (if you monitor with “intel agent gadget” app, you can see that the CPU is Throttling down, this is where audio crackling happens…)
Disable TB, do the same test, everything runs smooth.
CPU throttling is a BIG issue on all mac (except G5 tower), because every users thinks, wow my Mac is opening apps so fast ! BUT it is normal because of the TBoost, the CPU is always Overclocking…But CPU is going down as soon as the temperature goes too high due to overclocking.
We don’t need that when doing real-time audio treatment. We need a stable CPU clock, not going up not going down.
I use “Volta” app to limit the TDP of the CPU at 65W (MacMini 2018 I7 6-cores) and at 45W (MBP Retina i7 4-cores).
I also, when available, load every app in “low resolution mode” (right click on app, “get info”, tick the “low resolution mode”) this will force OSX to NOT load the app in Retina graphics.
Hope this will help !
April 2, 2019 at 13:33 #5773
- This reply was modified 2 weeks, 5 days ago by rapace312.
Thanks for sharing your experience Romain.
The utter cpu stability of turning off turbo boost gives me way more confidence actually.
Looking at the intel gadget, turbo boost makes the cpu speed go all over the place. Not sure if this is bad per se, but stable is always good, and the difference in “live professor dsp” is not even that big.
For me, the low resolution does not make a difference. It did make a difference on my earlier macbook that only had integrated graphics though.
HuubApril 3, 2019 at 01:25 #5774NikolaiParticipant
Thank you for that insight Romain, makes total sense.
I also read up on the turbo boost and came to the same conclusion, it will only boost for a short time, and then get hot, and then lower the cycles to cool off.
The absolute goal is to get the tasks LiveProfessor needs done every couple of milliseconds to be completed within the time window, and the CPU going up and down in speed sure does not help.
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