[Radiance-general] [Radiance-openstudio] Updated Radiance Installers Available

[Andrew McNeil]

Hi German,
The GPU code didn't provide any acceleration over CPU code  for a single
annual run,  It only helps for dozens or more parametric annual runs (many
BSDF's many view matrices, many climates ...)  and even then it was only
marginally better.

The bulk of the acceleration in the dctimestep?pu code comes from loading
the data once and multiplying everything once. The old way of doing
dctimestep for a single time step and looping requires the V, T &
D matrices to be loaded and multiplied for each time step - clearly this
isn't efficient for an annual run since the matrices don't change.

The updated version of dctimestep performs as well as the dctimestep?pu, is
more robust than dctimestep?pu (no segfaults when matrix dimensions don't
match) and can handle rendered view matrices.

Yes, you gan give dctimestep a rendered view matrix and have hourly annual
renderings after about 2 hours.

Hope that helps,
Andy


On Fri, Feb 22, 2013 at 6:57 AM, Germán Molina Larrain <gmolina1 at uc.cl>wrote:

> Sorry for taking this topic back alive but I have two questions.
>
> 1.- (I do not know much about programming) Why are dctimestepCPU(GPU) no
> longer needed? is this new version as fast as GPU calculation? was there ay
> disadvantage?
>
> 2.- It seems that I can not download the epw2wea program. Do I have to
> download the entire DAYSIM package?
>
> THANKS
>
> German
>
>
> 2013/2/19 Andrew McNeil <amcneil at lbl.gov>
>
>> Just to clarify, you do need the newest head version of dctimestep to use
>> the skymatrix generated by gendaymtx in a three-phase calc.
>>
>> it goes like this:
>> gendaylit Chicago.wea > Chicago.smx
>> dctimestep -n 8760 sensors.vmx fenestration.xml exterior.dmx Chicago.smx
>> > illuminance.txt
>>
>> (where -n is the number of time steps in your sky matrix file)
>>
>> You can use epw2wea from daysim to convert epw to wea format (
>> http://daysim.ning.com/subprogram/epw2wea).
>>
>> Andy
>>
>>
>> On Tue, Feb 19, 2013 at 12:16 PM, Guglielmetti, Robert <
>> Robert.Guglielmetti at nrel.gov> wrote:
>>
>>>  Hi German,
>>>
>>> Yes, gendaymtx is in the HEAD, the installers in the NREL site are based
>>> on the HEAD as of Thursday of last week, I believe. And no, the GPU
>>> dctimestep is not needed for this to work (nor is that version of
>>> dctimestep in HEAD). Nope, gendaymtx works with all the standard Radiance
>>> tools. You simply need a weather file formatted the way it wants, which is
>>> the same format as a DAYSIM weather file. Andy McNeil notes that DAYSIM has
>>> a tool to convert the EnergyPlus weather file format (.epw) to the DAYSIM
>>> format. OpenStudio will be modified to automatically provide gendaymtx with
>>> the epw data in the format it expects. I noticed that gendaymtx also
>>> accepts weather data from STDIN, and that there is an option to feed it
>>> less than a full year (8760) of data. We will leverage this ability in
>>> OpenStudio for sure, as well.
>>>
>>> Exciting times!
>>>
>>> - Rob
>>>
>>>
>>>
>>>
>>> Rob Guglielmetti
>>> Commercial Buildings Research Group
>>> National Renewable Energy Laboratory (NREL)
>>> 15013 Denver West Parkway MS: RSF202
>>> Golden, CO 80401
>>> 303.275.4319
>>> robert.guglielmetti at nrel.gov
>>>
>>> -----Original Message-----
>>> *From: *Germán Molina Larrain [gmolina1 at uc.cl]
>>> *Sent: *Tuesday, February 19, 2013 12:25 PM Mountain Standard Time
>>> *To: *Radiance general discussion
>>> *Cc: *bldg-sim; radiance-openstudio
>>> *Subject: *Re: [Radiance-general] Updated Radiance Installers Available
>>>
>>> Good to know!
>>>
>>> Is gendaymtx available in the HEAD version of Radiance? Is the GPU
>>> version of dctimestep needed for using that?
>>>
>>> THANKS VERY MUCH
>>>
>>> German
>>>
>>> 2013/2/19 Guglielmetti, Robert <Robert.Guglielmetti at nrel.gov>
>>>
>>>> Hi folks,
>>>>
>>>> Just a quick note to let you all know that the Radiance installers have
>>>> been updated, and are available for download at the NREL OpenStudio site.
>>>> These packages include the brand new 'gendaymtx' utility that greatly
>>>> speeds up the annual calculation when using the daylight coefficient tools
>>>> in Radiance.
>>>>
>>>> We hope to add gendaymtx into the OpenStudio tool chain and workflow in
>>>> the coming weeks, but in the meantime, I'm sure Greg would appreciate any
>>>> feedback from users willing to try it out on their own, especially those
>>>> Windows users out there. There's a man page explaining its use, and it's
>>>> pretty straightforward.
>>>>
>>>> Grab yours here:
>>>>
>>>>
>>>> http://openstudio.nrel.gov/getting-started-developer/getting-started-radiance
>>>>
>>>> Ok, bye.
>>>>
>>>> -Rob Gee
>>>>
>>>> Rob Guglielmetti
>>>> Commercial Buildings Research Group
>>>> National Renewable Energy Laboratory (NREL)
>>>> 15013 Denver West Parkway MS: RSF202
>>>> Golden, CO 80401
>>>> 303.275.4319
>>>> robert.guglielmetti at nrel.gov
>>>> _______________________________________________
>>>> Radiance-general mailing list
>>>> Radiance-general at radiance-online.org
>>>> http://www.radiance-online.org/mailman/listinfo/radiance-general
>>>>
>>>
>>>
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>>
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