100% cpu in IPR usage in daily?

[Stefan-L]

for some reason i get often 100% cpu usage in IPR render, even though i set the IPR to not use all threads.

any idea?
this is new for me, i use latest v13 daily

this means i can hardly edit any while IPR is running

thanks
for info/help
Stefan

[TomG]

What OS, and what hardware, please? And can you share screengrabs of the settings, so we can double check what you have set :) Thanks!

[Stefan-L]

win10, dual xeon 56 core, c4d 2024.5

default settings, denoiser for IPR off

also if i reduce the cpu usage  settings for IPR it doesnt improve

i didn t have this in 12, but now in almost any bigger scene, i cannot even stop the the ipr render or close the vfb window(only after many tries)

the extreme cpu usage problem is ONLY when rendering IPR, not when rendering final images.

[Stefan-L]

ok maybe i found it; the default -1 setting (one thread less than all possible threads) seem not to work anymore, also not -2,-3,-4...

what does work it seems is set the actual thread number, so i used 24 threads and now ipr usage is like expected and the gui doesnt stall anymore.

[Stefan-L]

sadly i must say it isnt solved, the problem comes back after a time:

1) even though i set cpu thread usage to 12(on a 56thread pc) it often uses 99% cpu power, it seems to ignore this setting
i also had the case where it did ignore the max IR resolution which i have at 1600px, still it did render more than 17xxpx

it seems the settings are party ignored, it is not related to once scene but many new and older, most time faster a time of rendering,
it is ONLY in IPR, fial render works fine.

somehow i have the feeling v13 has a very aggressive threading for the pr, this is counter productive. today i had to force kill a project, loosing 20 min of work, and not even that worked, the only way was to force restart the whole PC.

i hope you can solve it, Corona is great, but this problem is quite a pain.

[Ales]

Hey, the issue with IR threads limit not working should be resolved in the latest RC2.

[Stefan-L]

thanks Ales,

i load this right away, RC2 seem to have some very good fixes!