POV-Ray : Newsgroups : povray.general : Threads and rendering performance : Re: Threads and rendering performance Server Time
23 Apr 2024 13:45:44 EDT (-0400)
  Re: Threads and rendering performance  
From: Le Forgeron
Date: 15 Dec 2023 13:39:14
Message: <657c9d52@news.povray.org>
Le 01/12/2023 à 14:57, William F Pokorny a écrit :
> On 11/30/23 09:23, Chris R wrote:
>> So, I looked into limiting the number of worker threads in POV-Ray to 
>> make sure
>> there was always some spare capacity to do other things without 
>> triggering
>> whatever Windows 11 bug is causing this.  My machine has 14 cores and 
>> 20 logical
>> processors.  Running with the default settings, it would peg all 20 
>> logical
>> processors at or near 100% when doing a large render.  Doing some 
>> experiments I
>> verified that worker threads take up one logical processor (vs 
>> cores).  I ended
>> up settling on a new default using 12 worker threads instead of the 
>> max, which
>> based on performance monitoring tools runs at about 50% overall CPU 
>> utilization.
>> The odd thing I've noticed, though, is that my renders are not 
>> significantly
>> slower.
> I think Jerome, now a long time ago, did some detailed analysis on the 
> value of threads overs cores. I cannot immediately find it... I believe 
> it showed there is some, but not great value to POV-Ray where threads 
> exceed the number of physical cores. I think he showed Something like a 
> gain of another 10-15% in performance.

Be my guest:


See the bottom of the page

Post a reply to this message

Copyright 2003-2023 Persistence of Vision Raytracer Pty. Ltd.