[Radiance-general] Re: Radiance timings on PowerMac

[Mark Stock]

Greg,

Yes, I've noticed that. I'm finally sitting on a dual-processor
box here at work, though I have insufficient RAM here to render
the kinds of scenes that I want. The image for SIGGRAPH this
year will probably take up 1.5 GB of RAM once the ambient cache
becomes fully populated. I'm shooting for a final resolution of
28800x14400 pixels.

A year or two ago, someone submitted a speed test for the
same scene, Paul's bench2, using a dual-processor box and
rad/rpiece. See note 8 on my bechmark page. The author found
a 1.6 speedup for dual processors using 20-25 divisions in
rad/rpiece.

Is there no newer gcc for OSX than 3.1?

Mark

On Wed, 4 Jun 2003, Greg Ward wrote:
>
> Yes, my PowerMac is a dual-processor, so the system was taking
> advantage of the second processor on the piped command output used by
> oconv, apparently.  Two rpict processes would finish in the same time,
> and both processors can be used simultaneously by programs such as
> ranimate, ranimove, rpiece, rholo, and some of the scripts (like
> falsecolor).
>
> -Greg
>
> > From: Mark Stock <mstock@umich.edu>
> > Date: Wed Jun 4, 2003  11:01:54  AM US/Pacific
> > To: Greg Ward <gward@lmi.net>
> > Subject: Re: Radiance timings on PowerMac
> >
> > Is that a dual-processor machine, Greg? The only place I've
> > ever seen user times greater than wall clock times is for
> > oconv on a dual-proc machine.
> >
> > Mark
> >
> > On Wed, 4 Jun 2003, Greg Ward wrote:
> >
> >> Hi Mark,
> >>
> >> I ran your test on my 1.42 GHz PowerMac running OS X 10.2.6 using
> >> Radiance 3.5 compiled with gcc 3.1 -O2, and got the following results:
> >>
> >> oconv scene.rad
> >> 26.100u 2.050s 0:23.08 121.9%   0+0k 0+2io 0pf+0w
> >> rpict -t 30 -vf v1.vf -ab 1 -x 1000 -y 1000 scene.oct
> >> rpict: 34274852 rays, 100.00% after 0.144u 0.000s 0.152r hours on
> >> anyhere.local.
> >> 512.010u 6.820s 9:06.75 94.8%   0+0k 9+4io 0pf+0w
> >> pfilt -x /2 -y /2 scene.pic
> >> 0.560u 0.010s 0:00.59 96.6%     0+0k 0+0io 0pf+0w
> >>
> >> Nice webpage!
> >> -Greg
>
>