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Old 06-02-2017, 04:38 AM
Rockman413 Rockman413 is offline
Join Date: Nov 2009
Posts: 475
Default Cpu usage, Total does not mean total?

Hi there,
So I'm very much into performance. When running at lower buffer size, I watch the CPU usage and find an interesting thing:

When all the cores are under 50%, sometimes the Total reaches 100%, WHY?
Can the expert who knows this tell us? Why all cores are under 50% but total could reach 100%? Isn't the total should be the average of all cores? What does Total means?
Why sometimes there's a tiny red label "|" to the right of total, and when that red "|" reaches 100% there's clicks&pops even though the yellow total is only 50%, why?

Mac Pro 3.0G 8 Cores PT HD use with Ensemble Thunderbolt
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Old 06-04-2017, 04:02 AM
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LightWing LightWing is offline
Join Date: Sep 2008
Location: Titusville, FL
Posts: 543
Default Re: Cpu usage, Total does not mean total?

VERY good question. I see this ALOT.


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Old 06-05-2017, 12:58 AM
eesn eesn is offline
Join Date: Jan 2010
Location: london
Posts: 157
Default Re: Cpu usage, Total does not mean total?

PT is only some of everything the CPU executes. PT's audio is only part of everything PT runs when active. Think playing and scrolling on an integrated graphics GPU/CPU.

Then there's threading, where meaningful values go to N x 100%, N being the number of of cores. Then there's hyperthreading, which means each core can often run up to two threads at full speed, but rarely two at full speed, my experience is 1 at 100% and 1 at 50% tops.

I guess "it's complicated" isn't too out of place to say. That said, find a value at which things no longer "work" and simply avoid it.

PT10 for instance had a habit of engaging all DSP code always at all times. I don't remember CPU load fluctuating w/ PT10. Made a nice little heater of the computer, even when not playing, or with plugins on empty tracks..
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