[Sidefx-houdini-list] Hardware and rendering speeds

craigleehoffman at aol.com craigleehoffman at aol.com
Wed Jan 28 13:43:27 EST 2009


 I wonder if there was some inadvertant CPU processes or OS/driver overhead related to the other graphics card that freed up CPU cycles when you changed...? Did you have a screen saver or something like that going while rendering that could have been hitting the hard drive or CPU?..

Otherwise I am stumped too.? It shouldn't make a difference as far as my understanding goes.

-Craig Hoffman


-----Original Message-----
From: Mark Bolstad <the.render.dude at gmail.com>
To: sidefx-houdini-list at sidefx.com; gravatar at gravatonia.com
Sent: Tue, 27 Jan 2009 1:15 pm
Subject: Re: [Sidefx-houdini-list] Hardware and rendering speeds

When you say "cut by a 1/3", I assume you mean faster, i.e., going from 90
sec to 60 sec.

What renderer are you using? Is it possible that it has offloaded some of
the processing to the GPU?


On Fri, Jan 23, 2009 at 9:52 AM, <gravatar at gravatonia.com> wrote:

> Hi all,
>   I have run across a curiosity and wonder if one of y'all might have an
> explanation.  I recently upgraded my Home PC where I do a lot of my set up
> work.
>  However, I also use it as a rendering station as well.   I first upgraded
> my
> processor from a Q6600 quad to one of the new I7 chips.  Incredible
> difference.
> Cut my render times by half or as much as two thirds depending on the
> scene.
> (The beastier the render, the better the improvement.  I also decided to
> upgrade
> the video card and did so a few days after I switched out the processor so
> that I
> could cobble together an extra machine to do editing with when the big
> thesis
> renders are going (all the time.)  I went from an old Nvidia 8800 GTS (384
> MB
> version) to a Radeon 4850 with a full gig of video memory.  When I started
> rendering again, I found an unexpected surprise.  My render times had been
> cut by
> almost 1/3 from before the video upgrade.  As far as I knew, video memory
> and GPU
> only effected open GL type real time render speeds, but not the sort of
> rendering
> I do, I was under the impression that if you had plenty of ram, it was all
> about
> the CPU to increase render speeds.  Any ideas?  I'm stumped.
> Grav
> p.s.  Yes I know a quadro or Fire GL is supposed to be better, but I am on
> the
> grad student budget.
> On Thu Jan 22 20:23 , Rangi Sutton <rangi at kanuka.com.au> sent:
> >Lucio Flores wrote:
> >> Thanks!!
> >>
> >> Is there an expression returning the dimensions of a houdini volume?
> >>
> >To get size (not res) isolate the volume prim into it's own SOP, then
> >use bbox()?
> >
> >r.
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