sdatkinson
[BUG] NAM works fine at 128 samples, but eat huge cpu percentage at 256 and higher?
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Description
NAM is seems to be "tuned" for low latency, and that hurts higher latencies. Explanation: for me NAM actually works at 128 samples, better than at 512 samples latency. 16 samples - 50% RT CPU, hitches. 32 samples - 4% RT CPU, 64 samples - 2-3% RT CPU, 128 samples - 1,0% RT CPU during playback, 256 samples - SKYROCKETS! to 120-150% RT CPU, massive hitches, 512 samples - SKYROCKETS! to 150-170% RT CPU, massive hitches. And then more samples - more RT CPU usage and more hitches.
Tested using VST3 in Reaper v7.36 using Audient ID4 Asio driver, and happened with at least two Ryzen CPU, Ryzen 7 2700x and Ryzen 7 7700.
To reproduce
Steps to reproduce the behavior:
- Set your latency in ASIO for anything higher than 256 samples.
- Playback audio
- Observe CPU usage and listen for hitches.
Expected behavior
Plugin should work fine at lower samples if PC can handle it, can work fine on higher samples, instead - it works worse on higher latencies.
Screenshots
- 128 samples
- 512 samples
Computer & other info
(please provide the following information):
- OS Windows 11, 23H2
- RTX 4060
- v 0.7.13, but I think I observed this behaviour on earlier versions too.
- VST3
- Reaper
- Audient ID4 MK2
- 48KHZ
- Listed above
- Provide a model that the bug happens with (except if the bug happens without a model loaded) - I personally have multiple NAMs with different models stacked in project, but I'm not sure whether this behaviour happens only with multiple nams or not, and if model matters. - Folder with two nam models - https://drive.google.com/drive/folders/1WoSbFnh1k6IiVhmfhypLtqzER2dZhhAd?usp=sharing
- Provide an IR that the bug happens with (except if the bug happens without an IR loaded) - IR makes no difference.
- Does the bug not happen under some other conditions? If you can find what one thing makes the difference between the bug appearing and not, this drastically improves the chances I can fix it. - Listed above.
Additional context
Of course I understand that such plugins are expected to used at more lower latencies, but that shouldn't mean that higher latencies need to awful.
I have done thorough testing and I was able to confirm that NAM Universal misbehaves and is not setup properly for multithreading in FL studio. Each instance uses one CPU core!
Additionally, what the @DivannKokos reports about the number of samples is correct as well - about 20% CPU per instance of NAM at 128 samples, doubles to 40% per instance above 256 samples, and reaches up to 60% per instance above that.
Additionally, what the @DivannKokos reports about the number of samples is correct as well - about 20% CPU per instance of NAM at 128 samples, doubles to 40% per instance above 256 samples, and reaches up to 60% per instance above that.
Just for curiosity, what is your CPU? AMD Ryzen too, or an Intel one?
Additionally, what the @DivannKokos reports about the number of samples is correct as well - about 20% CPU per instance of NAM at 128 samples, doubles to 40% per instance above 256 samples, and reaches up to 60% per instance above that.
Just for curiosity, what is your CPU? AMD Ryzen too, or an Intel one?
Intel Core i9-12900H