question

Edward Conry avatar image
Edward Conry asked ·

cpu render performance warnings

arnold1.txt

In my render log I get this warning. "Rendering CPU utilization was only 14%. Your render may be bound by a single threaded process or I/O." I have 36 cores and I think it's rendering a little slow. Is there a way to utilize my cpu more. Is scene loading a single thread operation? Here's my render log.

rendercpu
arnold1.txt (31.4 KiB)
10 |600 characters needed characters left characters exceeded

Up to 5 attachments (including images) can be used with a maximum of 2.0 MiB each and 9.8 MiB total.

Stephen Blair avatar image
Stephen Blair answered ·

Or just batch render the maya scene from the command line? I wouldn't expect that to be using the progress driver.

Share
10 |600 characters needed characters left characters exceeded

Up to 5 attachments (including images) can be used with a maximum of 2.0 MiB each and 9.8 MiB total.

Thiago Ize avatar image
Thiago Ize answered ·

The log file says:

00:00:09   934MB         | frame time                   0:07.93    machine utilization (13.68%) 
00:00:09   934MB         |  node init                   0:00.04 
00:00:09   934MB         |  driver init/close           0:05.14 
00:00:09   934MB         |  rendering                   0:01.72 
00:00:09   934MB         |   pixel rendering            0:01.70 
00:00:09   934MB         |  unaccounted                 0:01.02 

So the majority of your render time is related to writing out the images (the driver init/close). My guess, from looking at your other log file stats is that the specific culprit is the progress_driver open, which is doing some maya calls to setup the progress bar. The actual rendering, which is multi-threaded only took 1.7s.

I suspect that if you wrote your scene out to an .ass file and rendered with kick that you'd find it much faster and would have a higher machine utilization. I'll see if we can repro the slow progress bar setup on our end and if there's anything we can do to improve it.

Share
10 |600 characters needed characters left characters exceeded

Up to 5 attachments (including images) can be used with a maximum of 2.0 MiB each and 9.8 MiB total.

Write an Answer

Hint: Notify or tag a user in this post by typing @username.

Up to 5 attachments (including images) can be used with a maximum of 2.0 MiB each and 9.8 MiB total.

Welcome to the Arnold Answers community.

This is the place for Arnold renderer users everywhere to ask and answer rendering questions, and share knowledge about using Arnold, Arnold plugins, workflows and developing tools with Arnold.

If you are a new user to Arnold Answers, please first check out our FAQ and User Guide for more information.

When posting questions, please be sure to select the appropriate Space for your Arnold plugin and include the plugin version you are using.

Please include images, scene and log files whenever possible as this helps the community answer your questions.

Instructions for generating full verbosity log files are available for MtoA, MaxtoA, C4DtoA, HtoA, KtoA, and Kick.

If you are looking for Arnold Documentation and Support please visit the Arnold Support site.

To try Arnold please visit the Arnold Trial page.

Bottom No panel present for this section.