Note: The Linux version is currently the unofficial version. I used the
x-povray version.

Settings used

#1, +ft +b500 +e320 +h240 -a +v +d +mb3 +sp45 +ep4 -p
#2 same as above with -d and no preview renders.
Note: Win95 edit priority = Normal, render = Highest.

All times in Secs.

Render file Win95-1 Win95-2 Linux-1 Linux-2
Soft.pov        162 141 104 88
intee1.pov 53 43 34 27
fish13.pov 201 176 117 101
piece2.pov 395 359 283 255
teapot.pov 59 49 33 25

These next scene files are from irtc, to try some real world renders

galax1.pov 49 36 46 35
Voyager1.pov 93 82 55 48
Water.pov 830 714 692 661
Dawnsidi.pov 1299 1257 1240 1169
its_cold.pov 1847 1894 1671 1495

On adv I get a 26.5 % gain from using Linux.

Note on the Dawnsidi scene the difference wasn't as great, as the parse time
for the scene alone was around 6 mins.

Cheers. Fran.

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Wow, big difference.  I haven't run povray on Win since 1997, and found about a
10% difference.   Now I'm curious to try again, except I don't have Win
available. But I am, this evening, playing with compiler optimizer flags to see
how fast I can get povray to run. 

Can you explain why the first set of scene files show a dramatic difference,
while the irtc scenes show less, some almost no difference?

-- 
Daren Scot Wilson
dar### [at] pipelinecom 
www.newcolor.com
----
"A ship in a harbor is safe, but that is not what ships are built for"
                                            -- William Shedd

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Daren Scot Wilson wrote in message <36C5D516.29C98CDA@pipeline.com>...
    .... Snipped
>
>Can you explain why the first set of scene files show a dramatic
difference,
>while the irtc scenes show less, some almost no difference?
>
>--
>Daren Scot Wilson

From what I could see, was with scenes that had a longer parse time, didn't
get as big an improvement. Prob, due to the lots of memory allocations for
all of the objects....

Also I think that 2 of the test scenes, used Radiosity...

Its_cold was one, and I think Dragwat/water.pov was the other one.....

BTW, the speed difference was greater than I expected as well. I was only
hopeing for around 10% at the most...

Now All I want to try is a IDE that can be set to use POV for it's
'complier'.
There is a good one for Gnome that I'm going to try out...

Cheers Fran..

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Your test might not be a good indicator of rendering speed differences.

I didn't notice until you pointed out that some of the scenes use
radiosity that your command line also includes mosaic preview options. 
There's a bug in the windows code that causes the mosaic preview to take
much extra time due to backtracking on display of the percent bar.

You should try it without the mosaic preview or radiosity.

-Mike

Fran & Melissa wrote:
> 
> Daren Scot Wilson wrote in message <36C5D516.29C98CDA@pipeline.com>...
>     .... Snipped
> >
> >Can you explain why the first set of scene files show a dramatic
> difference,
> >while the irtc scenes show less, some almost no difference?
> >
> >--
> >Daren Scot Wilson
> 
> From what I could see, was with scenes that had a longer parse time, didn't
> get as big an improvement. Prob, due to the lots of memory allocations for
> all of the objects....
> 
> Also I think that 2 of the test scenes, used Radiosity...
> 
> Its_cold was one, and I think Dragwat/water.pov was the other one.....
> 
> BTW, the speed difference was greater than I expected as well. I was only
> hopeing for around 10% at the most...
> 
> Now All I want to try is a IDE that can be set to use POV for it's
> 'complier'.
> There is a good one for Gnome that I'm going to try out...
> 
> Cheers Fran..

Post a reply to this message