POV-Ray : Newsgroups : povray.windows : Processor affinity? : Re: Processor affinity? Server Time
8 Feb 2023 08:06:02 EST (-0500)
  Re: Processor affinity?  
From: Thomas de Groot
Date: 6 Mar 2018 02:53:59
Message: <5a9e4917@news.povray.org>
On 5-3-2018 13:48, Stephen wrote:
> On 05/03/2018 12:18, Thomas de Groot wrote:
>> On 5-3-2018 10:11, Stephen wrote:
>>> On 05/03/2018 08:55, Mike Horvath wrote:
>>>> On 3/5/2018 3:51 AM, Thomas de Groot wrote:
>>>>> On 5-3-2018 9:49, Thomas de Groot wrote:
>>>>> I probably should have written "threads" instead of "cores". ;-)
>>>>>
>>>>
>>>> Wow, +wt is even better!!
>>>>
>>>> The docs mention threads and cores. But some CPUs have 2 threads per 
>>>> core, correct?
>>>>
>>>>
>>>>
>>>
>>> Yes my i7 CPU has 6 cores and 12 threads.
>>
>> I am always unsure about these things. I think my i7 CPU has one core 
>> and 8 threads. As far as I know...
>>
> It is generally 2 threads per core.
> 
>
http://www.expertreviews.co.uk/pcs/cpus/1400962/whats-the-difference-between-core-i3-i5-and-i7-processors


It is like cars. I have no idea what is happening under the hood. For 
all I know there is a bunch of squirrels running about in a treadmill ;-)

> 
> 
> 
>>>
>>> One other thought, only slightly relevant.
>>>
>>> If, toward the end of rendering a frame, you find that you are 
>>> waiting for one or two blocks to finish. Setting Render_Block_Size to 
>>> a smallish value allows all of your cores to work on the blocks 
>>> instead of being idle. I generally use +BS8
>>>
>>> http://wiki.povray.org/content/Reference:Tracing_Options#Render_Block_Size 
>>>
>>>
>>
>> Ah, yes! That might be very relevant indeed. Thanks!
>>
> 
> Sorry if I did not mention it when we were working on Dhalgren? .

You probably did, and I did not pay attention :-)

> 
> I leave +BS8 in the command line box. It is persistent and is there 
> whenever I start Pov 3.7. Unless I delete or change it.
> 

Yes, that is an excellent idea.... Done.

-- 
Thomas


Post a reply to this message

Copyright 2003-2021 Persistence of Vision Raytracer Pty. Ltd.