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[Chart] FM3 Block CPU Usage Estimates

chris

Legend!
As I did with previous gear, I've calculated estimates of CPU usage of all Blocks and Types for the FM3. I say this in the article I'm linking, but it's important so I'll repost it here first:

  • These values are only estimates.
  • The CPU meter changes quickly, so all % are within +/- 0.1% or so.
  • These values were calculated with no audio running through the FM3 and no USB cable connected. Real-time audio and processing does increase CPU a bit.
  • Values are calculated using the hardware CPU meter, not FM3-Edit.
  • All blocks are at Default Values for each type, unless noted in the Details column - endless combinations of values could change the CPU level.
As mentioned, these are just estimates. Adding numbers together that may work based off this sheet may not work on the actual unit by a few % due to many factors of running real-time processing. Some numbers move extremely quickly, so "best guess" is used at times. Again, just estimates for a general idea of CPU usage.

https://axefxtutorials.com/fm3/fm3-block-cpu-usage-estimates/
 

DLC86

Fractal Fanatic
Thanks Chris!

PS: a couple question for @FractalAudio or @Admin M@ .
The cpu load for the delay blocks is surprisingly low, I guess they run on the second core or on an accelerator?
The drive block is lower than I expected too (basically the same percentages I get on the axe fx III), is it running on a different core/accelerator or is it just less oversampled?
 
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Thanks for posting this! I am new to amp modeling, I just sold my tube amp and I'm waiting for my name to get called on for the FM3.

I have a question though, the Fractal Wiki states "On the FM3, amp modeling and reverb run on the same processor."
What does that mean? I'm assuming reverbs still take up 25-35% of the available CPU power. What is the benefit of it running on the same CPU?
 

blaggers

Inspired
Does the cpu usage report the maximum from the selected blocks across the four channels? Ie the highest drive pedal from channel A/B/C/D, or just the currently selected one?
 

gatgod77

Member
The base cpu @11 %
Is this used at all times as default by the System?
So we lose 11% straight off the Bat?
 

chris

Legend!
Does the cpu usage report the maximum from the selected blocks across the four channels? Ie the highest drive pedal from channel A/B/C/D, or just the currently selected one?
Always whatever is actually loaded.
The base cpu @11 %
Is this used at all times as default by the System?
So we lose 11% straight off the Bat?
Yes. A blank layout uses 11% and the approximate usable limit is 80%. These numbers on their own don’t really mean much. Actually using and adding blocks on the unit brings it all together.

The FM3 just launched. We will probably see improvements to all of this over time. Majority of blocks have had decreased CPU usage during testing so it can probably get even better from here.
 

jefferski

Fractal Fanatic
Wondering the same thing about the reverbs. If they're on the same core as the amps, then I'd think they wouldn't really show any usage, maybe a couple of points for having the block on the grid, but not 25%+. Does the meter show the combined total of both cores? Did the reverb get moved to the core that has the fx on it? Or ... ??
 

nota

Member
The amp block seems really low. I'm assuming that's because it's "offloading" the processing to its own CPU? I wonder what % of the other CPU it is actually using?
 

lyricbread

Experienced
Only 11% ?.

Take a look at how much hard drive space, memory and CPU Windows 10 uses. LOLOLOLOLOL @ 11% Thats a fart in a hurricane.
And don’t forget that the FM3 is still on it’s first public firmware version. I’m sure future releases will be more streamlined yielding better performance and optimization.
 

Pete1959

Inspired
If not for the horrible coding, premature releases, security flaws, etc found in Windows, I would have never have had a 25 year career in IT.
Perhaps unable to buy stuff from FAS, Roland, Fender, Peavey, Soundcraft, etc over that time as I would have had to settle for a lower paying job.
 
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