Render time increasing drastically towards the end of the render

Asked Feb 17 '19 at 12:29

Active Feb 17 '19 at 12:29

Viewed 43 times

I apologize in advance if I didn't manage to utilize the search function to its fullest.

I am through my first single frame scene render during which I had several iterations of previews and trial renders. I've tried various settings for the Cycles GPU renderer (experimental mode for the adaptive sub divs), path tracing.

The issue is that when I started the final render the estimated time to finish was 2.5 hours, which seemed OK to me. But in real life, the estimation timer practically stopped on the last 10% of the render, the CPU usage went from ~100% to 50%, the GPU usage went to 0%. The total time it took to render was 8 hours.

Anybody had a similar issue? Is there a way to avoid this dreadful phenomenon?

Thank you!

asked Feb 17 '19 at 12:29

user69320

Did the scene complexity increase towards the end? – WhatAMesh Feb 17 '19 at 12:31
A few tips: https://blender.stackexchange.com/a/16261/31447 – brockmann Feb 17 '19 at 13:08
No, Scene complexity does not increase towards the end. – user69320 Feb 17 '19 at 20:09
@brockmann I tried turning on the OPENEXR option - I supposed I should see a file being written to in the "output folder" during the render - Is that so? any special settings to change ? – user69320 Feb 17 '19 at 20:12
Yep, of course. Usually "/tmp" @user69320 – brockmann Feb 17 '19 at 20:28
@brockmann do changing directory from "/tmp" to any other directory affects the render time? – Yash Feb 18 '19 at 11:08
Why it should? @Yash – brockmann Feb 18 '19 at 11:15
You said change directory to /tmp and..? – Yash Feb 18 '19 at 11:16
I didn't say anything like that @Yash. – brockmann Feb 18 '19 at 11:26

Render time increasing drastically towards the end of the render

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