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I'm using MegaPOV 0.4a under Windows 2000. I just noticed that when doing
the photon mapping pass, the CPU utilization dropped steadilly from the
initial 100% down to as low as 9% before it finished. The memory usage was
moderate, and also varied a great deal between 2 and 10 MB, so it wasn't
swapping. HandleEx shows that there were no interesting files open, so
waiting on I/O would not account for it.
WHY would the system be idle so much when MegaPOV is running? I would
expect it to use 100% CPU if nothing else needed attention.
--John
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From: Thorsten Froehlich
Subject: Re: Strange CPU Usage in photon pass
Date: 11 Mar 2001 20:25:28
Message: <3aac2588@news.povray.org>
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In article <3aabe4f8$1@news.povray.org> , "John M. Dlugosz"
<joh### [at] dlugosz com> wrote:
> WHY would the system be idle so much when MegaPOV is running? I would
> expect it to use 100% CPU if nothing else needed attention.
POV-Ray uses all CPU time it gets from the system, it does not change
CPU usage in any way. If it does not get enough CPU time this depends
on the individual setup of your system and the priority setting of the
POV-Ray process. The Windows version allows you to set the priority of
the POV-Ray render process, but this is unlikely the cause of what you
observe. You may want to check for background processes or other system
services eating up the remaining CPU time.
Thorsten
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It is the Idle Process that is getting the rest of the time, not any other
process or service.
Has anybody else seen this?
--John
"Thorsten Froehlich" <tho### [at] trfde> wrote in message
news:3aac2588@news.povray.org...
> In article <3aabe4f8$1@news.povray.org> , "John M. Dlugosz"
> <joh### [at] dlugoszcom> wrote:
>
> > WHY would the system be idle so much when MegaPOV is running? I would
> > expect it to use 100% CPU if nothing else needed attention.
>
> POV-Ray uses all CPU time it gets from the system, it does not change
> CPU usage in any way. If it does not get enough CPU time this depends
> on the individual setup of your system and the priority setting of the
> POV-Ray process. The Windows version allows you to set the priority of
> the POV-Ray render process, but this is unlikely the cause of what you
> observe. You may want to check for background processes or other system
> services eating up the remaining CPU time.
>
>
> Thorsten
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