CPU usage dropping when making a DCP.

Anything and everything to do with DCP-o-matic.
accord
Posts: 4
Joined: Thu Nov 06, 2025 9:59 pm

CPU usage dropping when making a DCP.

Post by accord »

(I submitted this post before, but then I deleted before it got approved because i thought I solved the problem, but as soon as I deleted it came back so here I am again)
I recently got a new CPU (an i7-12700K) and I have been using it to make DCPS. It is very good, getting around the mark of 31~35 FPS -- when the CPU usage is not droping to a consistent 11 percent in a consistent window of time (for 3 seconds or so every 30 seconds) and reducing the fps to a 16~19 in the meantime.
I don't know what is happening, because when I had my old CPU DCP-o-matic used to mantain a consistent 95~97 percent usage (although it was a quadcore so at maximum it was only 9~11 fps).
I thought the problem was that I was making the DCP on my internal HDD instead of the SSD in which the O.S. is installed, but I moved the project to the SSD and It seemed to be going fine then after a while it came back.
I am not using anything that's too CPU consuming while making the DCP, and it has all 20 threads enabled on the configs.
You do not have the required permissions to view the files attached to this post.
Carsten
Posts: 3036
Joined: Tue Apr 15, 2014 9:11 pm
Location: Germany

Re: CPU usage dropping when making a DCP.

Post by Carsten »

Which version of DCP-o-matic are you using? Can you tell us what kind of source video you use? Is everything stored on a local SATA or m.2 SSD?

Would be interesting to see wether that drop pattern happens with other apps as well, you may want to find a multicore CPU benchmark and try with that.
IoannisSyrogiannis
Posts: 317
Joined: Mon Nov 13, 2017 8:40 pm
Location: Iceland

Re: CPU usage dropping when making a DCP.

Post by IoannisSyrogiannis »

It does seem like there is buffering there somewhere and it probably has to do with storage read/write, as your first suspected.
And the only program that I can see from the snapshots that goes higher in storage read write when the CPU drops occur is the bit torrent client. Which would mostly use storage than CPU.
What happens when you turn it off?

If I were you, I would had a better look on what happens on the drives' input and output when the CPU is dropping.