Apple M1's high swap memory, should Prefs turn down GPU?

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rsf123

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Apple M1's high swap memory, should Prefs turn down GPU?

PostWed Mar 10, 2021 8:11 am

When using an Apple M1 computer, what are the best Davinci Resolve preference settings that control GPU usage - in view of the high swap memory usage of the Apple M1 chip?

For background information, do a search for: apple m1 high swap memory

In my observation of my 16GB M1 computer, when running Davinci particularly the Fusion tab, I noticed the 16GB memory is usually maxxed out, with high swap memory usage, typically around 2 to 3 GB swap memory. There are user reports of people seeing swap memory usage around 12GB. This is leading to concerns that the high swap memory usage of the M1 could lead to premature SSD degradation.

However, from what I've seen, during such high swap memory usage, I notice that the CPU is hardly pushing over 10% usage, typically around 8%.

To me, this is consistent with Greekbench scores which show that the M1 chip has a very high single-core CPU performance, but mediocre GPU performance.

Therefore, my question is, are there any Preference settings in Davinci Resolve where I can cause greater use of the CPU, and less use of the GPU?

e.g. in Preferences / System tab / Memory and GPU / GPU Configuration, would it help to un-tick the GPU processing mode or GPU selection? Would this force Davinci to use more of the CPU rather than the GPU?

(Currently using 17.1)
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Hendrik Proosa

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Re: Apple M1's high swap memory, should Prefs turn down GPU?

PostWed Mar 10, 2021 9:39 am

Resolve processing (real image manipulation processing, not decoding/encoding) is GPU only. You can’t fall back to CPU here, unless there is some kind of emulation mode and even that won’t change necessary ram usage one bit due to M1 architecture where ram is unified and shared. M1 architecture has high swapping built in as a ”feature”.
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Uli Plank

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Re: Apple M1's high swap memory, should Prefs turn down GPU?

PostWed Mar 10, 2021 9:45 am

Well, DR alone is running pretty well even on a MB Air with only 8 GB RAM, but I wouldn't seriously use Fusion with the current M1 machines, which are all entry-level offers. Rather wait for 32 GB.

That said, I'd say modern SSDs will probably last longer than your computer getting outdated even with quite some swapping going on.
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