Re: Dual CPU (was Distrib Render) 2003-12-06 - By pmiinalainen
Back
Yes, but if you disable the hyper-threading in carrara, you also
disable multi-processor support for carrara. You won't enable or
disable it at OS level, just at program level. Hyperthreading needs
a multi-processor aware threading in the programs. Which is basicly
the same as the old option (in c1 and c2) to enable multiple
processors. There's just no separate control for multi-processors
and hyperthreading, I think.
I guess it's just more trendy to call it hyper-threading... Yes,
multi-processors existed before, but if you have one, just try what
happens if you disable hyper-threading. If you however have only
single processor without HT extensions, or that your motherboard
bios/OS doesn't support them, then Carrara can render faster with HT
off. But it also comes less responsive to user actions at the same
time. For over-night renders, it's a viable option for single
processor computers. You can gain 2...5% according to some of my
tests.
petteri
--- In Carrara@(protected), RayDreamr <danm@(protected)> wrote:
> There isn't now. not with Wintel. HyperThreading is a new
technology,
> it, simply said, allows a CPU to process two separate "threads" at
the
> same time. One processor looks like two processors to the OS
(Hence why
> my OS thinks I have 4 CPU's)
>
> There is currently no way to tell one application to just use this
CPU
> (or one of its threads) to do just this... That might be actually
> counter-productive.(?) (say one app need very little CPU power,
yet you
> devote it to that app... many cycles are going to waste)
>
> What probably has to happen, is programmers (like Eovia) will have
to
> write applications that can take advantage of dual processors (or
Quad,
> or...)
>
> In addition, if enough people wish to devote a CPU to a specific
> application, they will have to address the people that write the
OS's...
> so that can be possible.
>
> Even if it wee possible to do such... when I finally decide to let
> Carrara get on with rendering a scene, I want THAT to happen as
quickly
> as possible, if I need my CPU power for another task, I will hold
off on
> the Carrara (or other program) render until I am done. (or buy a
2nd
> computer of lesser power to carry out the task)
>
> I reality, with my system, I can have Carrara rendering, and have
other
> programs running with no appreciable degradation, unless I am also
> trying to do something CPU intensive, in which case... the better
> programmer gets more CPU time :)
>
> Dan
>
> PS, if you disable MultiThreading, Carrara has only one
> Processor(thread) to think about, and still takes as much of it as
> possible!
>
> PPS... HyperThreading happens in new Single CPU Pentium systems as
> well. Dual CPU's happened long before Hyperthreading tech.
>
> pmiinalainen wrote:
> >
> > Hyperthreading = multi threading = support for multiple
processor,
> > logical or physical
> >
> > If you disable multi-threading, carrara can't spread itself over
the
> > second processor. Sure, you'll take the speed hit in carrara.
But on
> > the other hand, you are free to do something else on the second
proc.
> >
> > I'm not sure (have'nt had a dual processor machine for 3 years),
but
> > i vaguely remember there is a way to do this in OS level...
> >
> > petteri
> >
> > --- In Carrara@(protected), RayDreamr <danm@(protected)> wrote:
> > > yeah, but why would I want to do that, there is a slight
> > performance
> > > increase with HyperTheading enabled.
> > >
> > > Also, the original message asked if there was a way to devote
one
> > > processor to Carrara and the other one to other tasks. This is
not
> > > possible.
> > >
> > > Dan
> > >
> > > Brian Hinton wrote:
> > > >
> > > > Couldn't you just disable multithreading then?
> > > >
> > > > Brian
> > > >
> > > > --- RayDreamr <danm@(protected)> wrote:
> > > > > No. Carrara will use whatever it can get, and in
> > > > > fact when rendering
> > > > > will generally steal from other running processes.
> > > > > (this is true of the
> > > > > PC Xeon, I presume that a Mac will do the same)
> > > > > During rendering, I
> > > > > generally see Carrara using between 95% to 99% of
> > > > > the CPU time. (all 4
> > > > > threads pretty much max out at 100% all the time)
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