[Radiance-general] Executing gen_dc, gen_directsunlight on multiple processors

[Mostapha Sadeghipour]

Hi Chris, Rob and Jan,

Hopefully this option will be added in the near future. For know I would
like to share the solution I came up with. To have the result on time I ran
multiple simulations at the same time instead of using multiple CPU's for
one simulation.

It's true that you cannot use multiple CPU's to run DAYSIM commands, but
there is no reason not to run multiple DAYSIM commands on one system as far
as you have enough RAM. So you can divide the sensors and run them at the
same time on one system. This simple trick saved me a huge amount of time.

Have a good weekend,
Mostapha


On Thu, Sep 1, 2011 at 2:19 PM, Jan Wienold
<jan.wienold at ise.fraunhofer.de>wrote:

> **
> Hi Mostapha,
>
> the -n option for multiple-core usage as it is implemented into rtrace is
> not working for rtrace_dc. In the (still unofficial) version of rtrace_dc of
> daysim 3.1, the -n  is supported but unfortunately does not have any impact
> on the calculation speed... :-( . I've tested that already. So with the
> current version it doesn't make sense to use this option and block the other
> cores.
> Maybe a later version supports this option.
>
> Christoph: An ambient file is not necessary for -n.
>
> By the way, does anybody know, if there is a limit for the -n option in
> rtrace?
> I tested it on my new 48(!!) core machine, but couldn't use more than 9
> cores, the other processes are existent  but don't use any cpu-time....
>
>
> Jan
>
>
>
>
> Am 01.09.2011 21:08, schrieb Mostapha Sadeghipour:
>
> Hi,
>
> I wonder if anybody know how I can run DAYSIM commands such as gen_dc and
> gen_directsunlight on multiple processors.
>
>  My understanding is both of them are sort of rtrace command so using -n
> option shouldn't be impossible.
>
> Thanks,
>  Mostapha
>
>
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